Small Parts

Small Parts

Explore our extensive selection of HK small parts at HKParts, perfect for repairs, upgrades, and custom builds. Our inventory includes high-quality, precision-machined replacement parts and maintenance kits designed for a wide range of HK models. Whether you need push pins, springs, or custom components, our HK-specific small parts ensure optimal performance and durability for your firearm.

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  • HKP Rear Sight Oval Washer

    HKP Rear Sight Oval Washer

    HKP HK Parts

    $2.95
    HKP Rear Sight Oval Washer HK German oval washer for the rear sight diopter style assemblies. This is the needed washer used in conjunction with the locking washer. Fits and works with all diopter-style rear sights.
    HKP-00870
    $2.95
    Qty in Cart: 0
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    $2.95
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  • HKP Roller +6 - New - 8.06mm HKP Roller +6 - New - 8.06mm

    HKP Roller +6 - New - 8.06mm

    HKP HK Parts

    $8.99
    Roller +6 - New - 8.06mm HK Parts Standard (8.06 mm) locking roller, The proper roller size is essential for proper bolt gap. US Manufacture. Please Note: The price listed is per roller. Order 2 (pair) for a complete set for the bolt head. An easy way to...
    HKP-19439
    $8.99
    Qty in Cart: 0
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    $8.99
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  • H&K Front Sight Tower & Cocking Handle Pin H&K Front Sight Tower & Cocking Handle Pin

    H&K Front Sight Tower & Cocking Handle Pin

    H&K Heckler & Koch

    $1.95
    H&K Front Sight Tower & Cocking Handle Pin Front sight tower roll pin for all HK 90 series front sights as well with some other applications. Compatible With: MP5 & SP5 MP5K & SP5K HK G3 & 91 HK 33, 53, 93
    HKP-00096
    $1.95
    Qty in Cart: 0
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    $1.95
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  • H&K MP5 & HK94 Firing Pin Spring

    H&K MP5 & HK94 Firing Pin Spring

    H&K Heckler & Koch

    $9.95
    HK German MP5 & HK94 Firing Pin Spring Fits all of the MP5, SP5, SP5K, MP5K 9mm and 40/10 Variants including MP5, 94 clones.The firing pin is one of the most common repair and replacement items. Compatible With: MP5 SP5 SP5K MP5K 9mm & 40/10...
    HKP-00062
    $9.95
    Qty in Cart: 0
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    $9.95
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  • On Sale
    HKP HK VP9/VP40 Enhanced Support Sleeve HKP HK VP9/VP40 Enhanced Support Sleeve

    HKP HK VP9/VP40 Enhanced Support Sleeve

    HKP HK Parts

    $9.95 - $19.95
    HKP HK VP9/VP40 Enhanced Support Sleeve The support sleeve in the VP series pistols is a crucial component that allows for the removal of the slide plate, firing pin assembly, and other parts. The factory version is made from polymer, which can wear down...
    HKP-18677-M
    $9.95 - $19.95
    Qty in Cart: 0
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    $9.95 - $19.95
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  • HKP Roller +2 - New - 8.02mm HKP Roller +2 - New - 8.02mm

    HKP Roller +2 - New - 8.02mm

    HKP HK Parts

    $8.99
    Roller +2 - New - 8.02mm HK Parts Standard (8.02 mm) locking roller, The proper roller size is essential for proper bolt gap. US Manufacture. Please Note: The price listed is per roller. Order 2 (pair) for a complete set for the bolt head. An easy way to...
    HKP-19423
    $8.99
    Qty in Cart: 0
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    $8.99
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  • HKP Roller +8 - New - 8.08mm HKP Roller +8 - New - 8.08mm

    HKP Roller +8 - New - 8.08mm

    HKP HK Parts

    $8.99
    Roller +8 - New - 8.08mm HK Parts Standard (8.08 mm) locking roller, The proper roller size is essential for proper bolt gap. US Manufacture. Please Note: The price listed is per roller. Order 2 (pair) for a complete set for the bolt head. An easy way to...
    HKP-19437
    $8.99
    Qty in Cart: 0
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    $8.99
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  • HKP MP5 & HK94 Firing Pin Spring - Enhanced

    HKP MP5 & HK94 Firing Pin Spring - Enhanced

    HKP HK Parts

    $4.95
    MP5 & HK94 Firing Pin Spring - Enhanced The "Enhanced" firing pin spring was analyzed and engineered from scratch with the latest in performance spring technology and an emphasis on reducing stress on the spring and increasing cycle life by 500%...
    HKP-02321
    $4.95
    Qty in Cart: 0
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  • H&K HK Pistol Match Trigger Return Spring

    H&K HK Pistol Match Trigger Return Spring

    H&K Heckler & Koch

    $8.95
    HK Pistol Match Trigger Return Spring This is the TRS that is in the Match trigger kit. This spring works better with the SA/DA and is lighter than the standard trigger return spring. This is a great spare part to have on hand...
    HKP-02666
    $8.95
    Qty in Cart: 0
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  • HKP Cocking Tube End Cap-Aluminum HKP Cocking Tube End Cap-Aluminum

    HKP Cocking Tube End Cap-Aluminum

    HKP HK Parts

    $12.95
    H&K Cocking Tube End Cap-Aluminum - US Made Made from weight-saving aircraft-grade aluminum alloy.  Compatible With: All 90 series HK firearms and clones that use a triple frame/sight tower
    HKP-02806
    $12.95
    Qty in Cart: 0
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  • HKP Roller +4 - New - 8.04mm HKP Roller +4 - New - 8.04mm

    HKP Roller +4 - New - 8.04mm

    HKP HK Parts

    $8.99
    Roller +4 - New - 8.04mm HK Parts Standard (8.04 mm) locking roller, The proper roller size is essential for proper bolt gap. US Manufacture. Please Note: The price listed is per roller. Order 2 (pair) for a complete set for the bolt head. An easy way to...
    HKP-19441
    $8.99
    Qty in Cart: 0
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    $8.99
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  • HKP Recoil Rod Guide Ring For Recoil Rod Assemblies - Enhanced HKP Recoil Rod Guide Ring For Recoil Rod Assemblies - Enhanced

    HKP Recoil Rod Guide Ring For Recoil Rod Assemblies - Enhanced

    HKP HK Parts

    $2.39
    HKP Recoil Rod Guide Ring For Recoil Rod Assemblies - Enhanced New enhanced material for greater longevity and durability. Our US made recoil rod guides are the made from the strongest most durable material available much better than the basic nylon as...
    HKP-17829
    $2.39
    Qty in Cart: 0
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    $2.39
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  • HKP MP5, MP5K, 94 & SP89 Firing Pin-Steel

    HKP MP5, MP5K, 94 & SP89 Firing Pin-Steel

    HKP HK Parts

    $17.47
    MP5, MP5K, 94, & SP89 Firing Pin - Steel Each part is made using the factory HK material and specifications from original HK German blueprints. Compatible With: MP5, HK94 MP5K, SP89, SP5K MP5 40, 10mm, .357 Sig Zenith, POF, Omega, DT,...
    HKP-02115
    $17.47
    Qty in Cart: 0
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    $17.47
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  • HKP MP5SD Sealing Ring - Enhanced

    HKP MP5SD Sealing Ring - Enhanced

    HKP HK Parts

    $9.95
    HKP MP5SD Sealing Ring - Enhanced The enhanced sealing ring is made from a newer, longer-lasting material as well as having a slightly thicker profile for secure sealing. The MP5SD sealing ring is the gasket that seals the SD suppressor against the...
    HKP-18053
    $9.95
    Qty in Cart: 0
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    $9.95
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  • H&K HK MR556/416 Enhanced Buffer Spring H&K HK MR556/416 Enhanced Buffer Spring

    H&K HK MR556/416 Enhanced Buffer Spring

    H&K Heckler & Koch

    $19.95
    Enhanced HK German MR556 & 416 Buffer Spring The HK MR556/416 buffer spring will also work with other AR-15 and M-16 rifles. It is a high-wear item and a must-have replacement part. Compatible With: HK MR556 HK416 HK416 A5 HK M27 AR15, M4 & M16
    HKP-00039
    $19.95
    Qty in Cart: 0
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    $19.95
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  • H&K HK VP9/VP9SK/P30/45 Clamping Pin Backstrap

    H&K HK VP9/VP9SK/P30/45 Clamping Pin Backstrap

    H&K Heckler & Koch

    $5.95
    Dowel Pin Or Clamping Pin  This HK roll pin is used to hold the backstrap in place. Compatible With: HK45 HK45 Compact HK P30 HK P30L HK P30SK HK VP9 HK VP9SK
    HKP-01810
    $5.95
    Qty in Cart: 0
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  • H&K MP5 & MP5K Firing Pin Spring

    H&K MP5 & MP5K Firing Pin Spring

    H&K Heckler & Koch

    $26.95
    H&K MP5 & MP5K Firing Pin Spring The latest firing pin spring features a stronger and more durable braided design, surpassing the standard non-braided spring in performance and longevity.  Compatible With: MP5, HK94, SP5 MP5K, SP5K,...
    HKP-00063
    $26.95
    Qty in Cart: 0
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    $26.95
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  • H&K Small Push Pin Replacement Spring H&K Small Push Pin Replacement Spring

    H&K Small Push Pin Replacement Spring

    H&K Heckler & Koch

    $1.95
    Replacement Spring for HK style push pin - Small  A must have replacement item to have on hand. A quick and easy install spring to get your push pins back to working condition. A great replacement for those worn out springs that come loose while in...
    HKP-20368
    $1.95
    Qty in Cart: 0
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    $1.95
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  • HK USP/USPC/45 Match Hammer Spring

    HK USP/USPC/45 Match Hammer Spring

    H&K Heckler & Koch

    $18.95
    HK USP, USPC, & HK45 Match Hammer Spring The match hammer spring is also known as the USPC standard hammer spring. This is also the correct spring needed for the light, TGS, and LEM conversion for the USPC & other custom pistol configurations...
    HKP-01410
    $18.95
    Qty in Cart: 0
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    $18.95
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  • H&K HK VP9/VP9SK, HK VP40 Trigger Return Spring

    H&K HK VP9/VP9SK, HK VP40 Trigger Return Spring

    H&K Heckler & Koch

    $3.95
    H&K HK VP9/VP9SK, HK VP40 Trigger Return Spring HK German stock trigger return spring. A must have spare part as the factory spring will wear with use. The TRS can also be damaged upon install if the spring tool is not used to install. Please order...
    HKP-16783
    $3.95
    Qty in Cart: 0
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    $3.95
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  • Out Of Stock
    H&K +4 Roller For Bolt Head 8.04mm - Over-sized H&K +4 Roller For Bolt Head 8.04mm - Over-sized

    H&K +4 Roller For Bolt Head 8.04mm - Over-sized

    H&K Heckler & Koch

    $19.95
    H&K +4 Roller For Bolt Head 8.04mm - Over-sized New HK German not surplus or used goods. The correct roller is essential for proper head spacing and the bolt gap. Compatible With: HKG3, 91 & PTR HK93, 33, 53 HK MP5, MP5K Cetme, C308 Clones...
    HKP-00508
    $19.95
    Qty in Cart: 0
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    $19.95
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  • PTR HK 91/G3 (7.62x51/.308) Rear Push Pin Reinforcement Weldment PTR HK 91/G3 (7.62x51/.308) Rear Push Pin Reinforcement Weldment

    PTR HK 91/G3 (7.62x51/.308) Rear Push Pin Reinforcement Weldment

    PTR

    $19.95
    HK91, G3, PTR, CETME Push Pin Reinforcement Weldment HK91/G3/PTR91 or CETME steel receiver flat weldment that is added to the rear of the receiver where the 2 large stock push pins install to reinforce this section of the receiver against damage or use...
    HKP-18224
    $19.95
    Qty in Cart: 0
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    $19.95
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  • H&K MP5 & MP5K F Style Roller Retainer Plate - 3rd Gen H&K MP5 & MP5K F Style Roller Retainer Plate - 3rd Gen

    H&K MP5 & MP5K F Style Roller Retainer Plate - 3rd Gen

    H&K Heckler & Koch

    $14.95
    HK German "F" Style 3rd Gen Roller Retainer Plate This is the latest and greatest German design of roller retainer plates found in all of the latest production of HK German bolt heads. The MP5 F roller retainer plate fits true F-style bolt heads only...
    HKP-00069
    $14.95
    Qty in Cart: 0
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    $14.95
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  • HKP HK21 T-Rail Set - 7.62x51/.308 HKP HK21 T-Rail Set - 7.62x51/.308

    HKP HK21 T-Rail Set - 7.62x51/.308

    HKP HK Parts

    $119.95
    HKP HK 21 (7.62x51/.308) Factory Style T-Rail Set HKP HK21 US made rails for all HK21 and FMP21 builds. Our steel T-rails incorporate an updated radius to address a weak link in previous iterations.  Compatible With:  HK21 FMP21
    HKP-21457
    $119.95
    Qty in Cart: 0
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    $119.95
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  • H&K HK P Series Combat Defensive Action Upgrade For LEM 4.1 Pistols H&K HK P Series Combat Defensive Action Upgrade For LEM 4.1 Pistols

    H&K HK P Series Combat Defensive Action Upgrade For LEM 4.1 Pistols

    H&K Heckler & Koch

    $89.95
    H&K HK P Series Combat Defensive Action Upgrade For LEM 4.1 Pistols Found on all (European CDA) variant 4.1 models. This drop in LEM upgrade kit is a great trigger upgrade that reduces the trigger pre-travel by about 5mm or 1/3 of the original...
    HKP-17647
    $89.95
    Qty in Cart: 0
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    $89.95
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  • HKP Spare Buffer For Folding Stocks & End Caps HKP Spare Buffer For Folding Stocks & End Caps

    HKP Spare Buffer For Folding Stocks & End Caps

    HKP HK Parts

    $9.95
    HKP Spare Buffer For Folding Stocks & End Caps New US manufactured flat style "H"buffer to replace the factory HK buffer on MP5K folding stocks and end caps. As well as a spare or replacement buffer for the MP5 & MP5K folding B&T stocks. Made...
    HKP-17886
    $9.95
    Qty in Cart: 0
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    $9.95
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  • HKP Rail Mount Compensator Replacement Screw Set HKP Rail Mount Compensator Replacement Screw Set

    HKP Rail Mount Compensator Replacement Screw Set

    HKP HK Parts

    $4.95
    Replacement Screws for Rail Mount Compensator Replacement screw set for the HK Parts Rail Mount Compensators. This includes (2) screws. Compatible With: All HK Parts Rail Mount Compensators
    HKP-19674
    $4.95
    Qty in Cart: 0
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    $4.95
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  • JMAC Customs Metric Face Mount Shims

    JMAC Customs Metric Face Mount Shims

    JMAC Customs

    $9.95
    JMac Customs Metric Face Mount Shims Custom shims for JMac muzzle devices. This kit includes varying thickness shims to "time" your muzzle device to your desired orientation. These shims are specifically made for JMac 14F, 15F, 24F and 26F muzzle devices...
    HKP-21446
    $9.95
    Qty in Cart: 0
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    $9.95
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  • H&K +2 Roller For Bolt Head 8.02mm - Over-sized H&K +2 Roller For Bolt Head 8.02mm - Over-sized

    H&K +2 Roller For Bolt Head 8.02mm - Over-sized

    H&K Heckler & Koch

    $24.95
    H&K +2 Roller For Bolt Head 8.02mm - Over-sized New HK standard (8.02 mm) locking roller. The proper roller size is essential for a proper bolt gap. New HK German, not surplus or used out-of-spec part. Please Note: The price listed is per roller...
    HKP-00507
    $24.95
    Qty in Cart: 0
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    $24.95
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  • HKP UMP/USC (.40 S&W/.45 ACP/9mm) Recoil Buffer HKP UMP/USC (.40 S&W/.45 ACP/9mm) Recoil Buffer

    HKP UMP/USC (.40 S&W/.45 ACP/9mm) Recoil Buffer

    $11.95
    HKP USC & UMP Recoil Buffer Replaceable spare lower housing or buffer for buffer housings. This is a high wear & replacement item and a must have for spare parts. Compatible With: HK USC .45 HK UMP models
    HKP-18746
    $11.95
    Qty in Cart: 0
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    $11.95
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  • H&K MP5, HK94, MP5K, SP89 & SP5K Firing Pin

    H&K MP5, HK94, MP5K, SP89 & SP5K Firing Pin

    H&K Heckler & Koch

    $39.95
    H&K MP5, HK94, MP5K, SP89 & SP5K Firing Pin - German Compatible With: MP5 HK94 MP5K SP89 SP5K 
    HKP-00061
    $39.95
    Qty in Cart: 0
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    $39.95
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  • HKP Cocking Tube End Cap-Steel HKP Cocking Tube End Cap-Steel

    HKP Cocking Tube End Cap-Steel

    HKP HK Parts

    $14.95
    Cocking Tube End Cap - Steel - US Made Manufactured from solid billet steel and finished in black in a nitride finish. Compatible With: All 90 series HK firearms and clones that use a triple frame/sight tower
    HKP-17580
    $14.95
    Qty in Cart: 0
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    $14.95
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  • HKP HK MP5 .22 Sling Clip Kit - Black HKP HK MP5 .22 Sling Clip Kit - Black

    HKP HK MP5 .22 Sling Clip Kit - Black

    HKP HK Parts

    $24.95
    HKP HK MP5 .22 Sling Clip Kit - Black Each unit will fit all models of the MP5 .22 that have the 3 mounting holes on the left side of the magwell. This item installs in a few mins and comes complete with all you need for the install. With the addition of...
    HKP-15706
    $24.95
    Qty in Cart: 0
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    $24.95
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  • HKP HK P30 Series Enhanced Magazine Release HKP HK P30 Series Enhanced Magazine Release

    HKP HK P30 Series Enhanced Magazine Release

    HKP HK Parts

    $49.95
    Enhanced Magazine Release  - Alloy - HK P30, P30SK, P30L New HK Parts Enhanced and Over-sized Magazine Release. The oversized magazine Release increases the overall surface area and makes it possible to release the magazine without changing the...
    HKP-21153-M
    $49.95
    Qty in Cart: 0
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    $49.95
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  • Ejector Lever Axle Retaining Spring

    Ejector Lever Axle Retaining Spring

    USA

    $1.95
    Ejector Lever Axle Retaining Spring This is the perfect spring ring to replace your worn out ejector lever axle spring ring. Made to HK spec for the best US replacement part on the market. Replacement of the retaining spring clip is necessary to keep...
    HKP-20629
    $1.95
    Qty in Cart: 0
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    $1.95
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  • H&K 91/G3 (7.62x51/.308) Firing Pin Spring

    H&K 91/G3 (7.62x51/.308) Firing Pin Spring

    H&K Heckler & Koch

    $9.95
    HK German HK G3, HK91, & PTR Firing Pin Spring This is a common repair and replacement item and is great for spares as this is a common breakage part.
    HKP-00498
    $9.95
    Qty in Cart: 0
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    $9.95
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  • HKP Rear Sights Locking Washer

    HKP Rear Sights Locking Washer

    HKP HK Parts

    $2.95
    HKP Rear Sights Locking Washer HK German rear sights toothed locking washer used in perfect working order.
    HKP-00869
    $2.95
    Qty in Cart: 0
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    $2.95
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  • H&K HK VP9/VP9SK, HK VP40 Clamping Sleeve Insert, Ejector Housing

    H&K HK VP9/VP9SK, HK VP40 Clamping Sleeve Insert, Ejector Housing

    H&K Heckler & Koch

    $1.95
    Clamping Sleeve For Insert, Ejector Block Housing For HK VP9, VP40 This is the factory correct roll pin for holding the ejector block housing in the frame. New HK German manufacture. Compatible With: HK VP9 HK VP9SK HK VP40
    HKP-16805
    $1.95
    Qty in Cart: 0
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    $1.95
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  • H&K HK .40 Barrel O-Ring - Green H&K HK .40 Barrel O-Ring - Green

    H&K HK .40 Barrel O-Ring - Green

    H&K Heckler & Koch

    $4.95
    HK German .40 Cal Barrel O-ring Get them while you can, as they are no longer made in green and are only offered while supplies last. The green o-rings were first used on the older HK pistols. Made from the same material as the...
    HKP-01985
    $4.95
    Qty in Cart: 0
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    $4.95
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  • H&K HK P30/45/P2000 Backstrap Roll Pin

    H&K HK P30/45/P2000 Backstrap Roll Pin

    H&K Heckler & Koch

    $5.95
    HK P30, 45, & P2000 Backstrap Roll Pin This is the commonly replaced roll pin for the rear backstrap that you can swap and change to different sizes. Great spare to have on hand when doing maintenance on your HK pistol. HK suggests...
    HKP-02274
    $5.95
    Qty in Cart: 0
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    $5.95
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