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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  • H&K HK MR556/416 Ejection Port Cover Door Assembly H&K HK MR556/416 Ejection Port Cover Door Assembly

    H&K HK MR556/416 Ejection Port Cover Door Assembly

    H&K Heckler & Koch

    $71.95
    HK German HK 416, MR556 Ejection Port Cover Door Assembly Complete This is the newer polymer style cover found on the latest HK 416 and MR556's. This is the complete ejection port door assembly needed on all AR15 or MR556/HK416 models. Can also be used...
    HKP-16951
    $71.95
    Qty in Cart: 0
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  • H&K HK P7 Series Drop Safety Catch Spring

    H&K HK P7 Series Drop Safety Catch Spring

    H&K Heckler & Koch

    $9.95
    HK P7 Drop Safety Catch Spring This is one of the most common wear items on the P7 series of firearms—a must-have spare part and hard to find. Compatible With: PSP P7M8 P7M13 P7M10
    HKP-01353
    $9.95
    Qty in Cart: 0
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  • H&K HK P7 Series Extractor Spring

    H&K HK P7 Series Extractor Spring

    H&K Heckler & Koch

    $7.95
    HK P7 Extractor Spring This is a common wear and replacement part, according to HK Germany. This is a great part to have on hand as a spare.  Compatible With: P7 PSP P7 M8 P7 M10 P7 M13
    HKP-00325
    $7.95
    Qty in Cart: 0
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  • H&K HK P7 Series Firing Pin Spring

    H&K HK P7 Series Firing Pin Spring

    H&K Heckler & Koch

    $7.95
    HK P7 Series Firing Pin Spring This item is a great spare to keep on hand, as this item is considered a high-wear item by HK. Compatible With: HK P7 PSP HK P7 M8 HK P7 M10 HK P7 M13  
    HKP-00326
    $7.95
    Qty in Cart: 0
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    $7.95
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  • H&K HK USP/USPC/45/45C LEM Cocking Piece Elbow Hammer Rebound Spring

    H&K HK USP/USPC/45/45C LEM Cocking Piece Elbow Hammer Rebound Spring

    H&K Heckler & Koch

    $7.95
    HK LEM Cocking Piece Elbow Hammer Rebound Spring This item is a common wear and replacement item for those who have LEM triggers installed. Compatible With: USP USPC HK45 HK45C
    HKP-02479
    $7.95
    Qty in Cart: 0
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  • HKP HK MR556/HK416 FFRS Retaining Spring

    HKP HK MR556/HK416 FFRS Retaining Spring

    HKP HK Parts

    $4.99
    HKP HK MR556/HK416 FFRS Retaining Spring The retainer spring retains the handguard locking pin on the free floating rail system (FFRS). These can become damaged with the removal of the handguard screws. Once the spring is damaged, they require...
    HKP-21503
    $4.99
    Qty in Cart: 0
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    $4.99
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  • H&K G36/MR556/MR762/416 (5.56/.223) & (7.62x51/.308) Extractor Spring

    H&K G36/MR556/MR762/416 (5.56/.223) & (7.62x51/.308) Extractor Spring

    H&K Heckler & Koch

    $8.95
    HK German Extractor Spring   A must-have replacement wear part and a great item to have on hand. Compatible With: HK G36 HK G36K HK G36C HK SL8 HK 416 HK MR556
    HKP-00288
    $8.95
    Qty in Cart: 0
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  • H&K HK MR556/416 Ejection Port Cover - Black H&K HK MR556/416 Ejection Port Cover - Black

    H&K HK MR556/416 Ejection Port Cover - Black

    H&K Heckler & Koch

    $34.95
    HK German HK 416, MR556 Ejection Port Cover HK manufactured newer polymer style cover assembly found on the latest HK 416 & MR556. This item can also be used on other AR15-style projects to enhance the project with the finest ejection port cover...
    HKP-15229
    $34.95
    Qty in Cart: 0
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  • H&K HK USP Series Old Style Firing Pin Block Spring

    H&K HK USP Series Old Style Firing Pin Block Spring

    H&K Heckler & Koch

    $9.95
    HK USP Series Old Style Firing Pin Block Spring In order to use the new firing pin block spring, you also have to upgrade the firing pin, firing pin block, as well as the firing pin block spring. HK part #214192 has been replaced with...
    HKP-02149
    $9.95
    Qty in Cart: 0
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  • Out Of Stock
    H&K 33/91/93/G3 Replacement Carry Handle - Used H&K 33/91/93/G3 Replacement Carry Handle - Used

    H&K 33/91/93/G3 Replacement Carry Handle - Used

    H&K Heckler & Koch

    $34.95
    HK German replacement carry handle for HK91, G3, HK93, & HK33 Weapon Systems - Used DOES NOT INCLUDE THE BRACKET.  BRACKET INCLUDED IN SECOND PICTURE IS FOR REFERENCE ONLY. HK German used surplus condition. Great replacement unit for handles...
    HKP-17150
    $34.95
    Qty in Cart: 0
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  • H&K Burst Trigger Pack Compression Rod Spring

    H&K Burst Trigger Pack Compression Rod Spring

    H&K Heckler & Koch

    $10.95
    H&K Burst Trigger Pack Compression Rod Spring Burst pack compression spring for compression rod found in all HK Burst Trigger Packs. This part, along with the compression rod, is the number one most common wear or breakage parts in HK Burst Packs...
    HKP-16199
    $10.95
    Qty in Cart: 0
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  • GSG9 HK G36/SL8 (5.56/.223) Forearm, Lower, Magwell - Push Pin

    GSG9 HK G36/SL8 (5.56/.223) Forearm, Lower, Magwell - Push Pin

    GSG9

    $21.95
    HK G36, SL8 Push Pin For Forearm, Magwell & Lower  Each push pin/locking pin retains the forearm, magwell & lower to the upper receiver. Each G36 style firearm uses a total of 3X of these push pins. Compatible With: G36 G36K G36C G36...
    HKP-18221
    $21.95
    Qty in Cart: 0
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  • H&K Flash Hider Retaining Ring

    H&K Flash Hider Retaining Ring

    H&K Heckler & Koch

    $1.49
    HK Flash Hider Retaining Ring Brand new HK German manufacture.  HK flash hider/muzzle break retaining ring.  This item is the ring that fits inside the flash hider that indexes with the splines of the HK barrel to provide a postive lockup of...
    HKP-16451
    $1.49
    Qty in Cart: 0
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  • H&K Standard Roller 8.00mm - Used H&K Standard Roller 8.00mm - Used

    H&K Standard Roller 8.00mm - Used

    H&K Heckler & Koch

    $7.95
    8.00mm Standard Size (zero or unmarked) For HK Roller Lock Bolt Head HK spec new unmarked 8.00mm roller that will fit all HK bolt heads including HK91/G3, HK93/33/53, HK94, MP5, SP89 all clones and the Cetme & Cetme clones. An easy way to remember...
    HKP-19374
    $7.95
    Qty in Cart: 0
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  • H&K 93/91/33/53/G3 (5.56/.223) & (7.62x51/.308) Bolt Locking Lever Spring For Bolt Head

    H&K 93/91/33/53/G3 (5.56/.223) & (7.62x51/.308) Bolt Locking Lever Spring For Bolt Head

    H&K Heckler & Koch

    $4.95
    HK Bolt Carrier Bolt Locking Lever Spring New HK German factory bolt carrier locking lever spring for locking lever latch. Compatible With: HK G3, HK91 PTR models HK93, 33, 53 Other clones and custom builds
    HKP-16274
    $4.95
    Qty in Cart: 0
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  • H&K HK P9S Series Recoil Spring

    H&K HK P9S Series Recoil Spring

    H&K Heckler & Koch

    $39.95
    Factory German HK P9 & P9S Recoil Spring It is no longer supported or available from HK Germany. The P9 and P9S have been out of production for many years. Get a spare while we still have them in stock. Compatible With: HK P9 pistols in 9mm and ...
    HKP-02046
    $39.95
    Qty in Cart: 0
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  • HK UMP/USC (.40 S&W/.45 ACP/9mm) Picatinny Rail Screw

    HK UMP/USC (.40 S&W/.45 ACP/9mm) Picatinny Rail Screw

    $0.75
    HK UMP/USC (.40 S&W/.45 ACP/9mm) Picatinny Rail Screw Good spares to have on hand as screws can get damaged or lost.
    HKP-16562
    $0.75
    Qty in Cart: 0
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    $0.75
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  • H&K SP5K 9mm Drop In Paddle Mag Release Upgrade Kit H&K SP5K 9mm Drop In Paddle Mag Release Upgrade Kit

    H&K SP5K 9mm Drop In Paddle Mag Release Upgrade Kit

    H&K Heckler & Koch

    $129.95
    German HK SP5K Anti-Rattle Roller Tipped Paddle Magazine Release Kit No modifications, no refinishing...complete drop-in kit included New HK German & USA made paddle mag release kit for the HK SP5K. This kit will allow any end-user to quickly...
    HKP-18082
    $129.95
    Qty in Cart: 0
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  • H&K HK USP/45/45C Detent Compression Spring

    H&K HK USP/45/45C Detent Compression Spring

    H&K Heckler & Koch

    $8.95
    HK Slide Detent Compression Spring For All HK USP & HK45, HK45C Models The detent spring is needed for positive de-cocking and safety functions of the detent plate. A spare and replacement part as it is prone to breakage and wear. This is also one of...
    HKP-01257
    $8.95
    Qty in Cart: 0
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  • HKP Roller +1 - New - 8.01mm HKP Roller +1 - New - 8.01mm

    HKP Roller +1 - New - 8.01mm

    H&K Heckler & Koch

    $8.99
    Roller +1 - New - 8.01mm HK Parts Standard (8.01 mm) locking roller, The proper roller size is essential for proper bolt gap. US Manufacture. Price is per roller.**You need to order two for a complete set (pair) for bolt head.**
    HKP-19424
    $8.99
    Qty in Cart: 0
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    $8.99
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  • H&K HK 416/417/MR556/MR762 Takedown Pin Detent Spring

    H&K HK 416/417/MR556/MR762 Takedown Pin Detent Spring

    H&K Heckler & Koch

    $6.95
    HK MR556, HK 416, HK MR762, & HK417 Takedown Pin Detent Spring New HK German manufacture. Detent spring for the rear takedown pin. Compatible With: HK 416 HK MR556 HK MR762 HK 417
    HKP-02541
    $6.95
    Qty in Cart: 0
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  • H&K UMP (.40 S&W/.45 ACP/9mm) Paddle Mag Release

    H&K UMP (.40 S&W/.45 ACP/9mm) Paddle Mag Release

    H&K Heckler & Koch

    $16.95
    UMP Paddle Magazine Release This is a common repair and replacement part as they are easy to break on the UMP lower. Simple and easy to install with no gunsmith needed or required. Compatible With:  UMP .45 UMP .40 UMP 9mm Please Note: This...
    HKP-00810
    $16.95
    Qty in Cart: 0
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  • H&K 93/53/33 (5.56/.223) Firing Pin Spring

    H&K 93/53/33 (5.56/.223) Firing Pin Spring

    H&K Heckler & Koch

    $9.95
    New HK German 93, 33, & 53 .223/5.56 Firing Pin Spring. A must-have spare part as this is a high wear and replacement item.  Compatible With: HK93, 33, 53   V93/V53, C93, C53 Custom builds and clones
    HKP-00193
    $9.95
    Qty in Cart: 0
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  • H&K HK P30SK Firing Pin Safety Pin H&K HK P30SK Firing Pin Safety Pin

    H&K HK P30SK Firing Pin Safety Pin

    H&K Heckler & Koch

    $4.95
    H&K HK P30SK Firing Pin Safety Pin This is a factory original HK part manufactured in Germany.
    HKP-18524
    $4.95
    Qty in Cart: 0
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    $4.95
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  • H&K HK416 A5 Factory German Extended Castle Nut

    H&K HK416 A5 Factory German Extended Castle Nut

    H&K Heckler & Koch

    $71.95
    H&K HK416 A5 Factory German Extended Castle Nut Original HK Factory German steel 416 A5 Extended Castle Nut. Perfect for MR556, HK 416 A5 builds, or upgrades. 
    HKP-19164
    $71.95
    Qty in Cart: 0
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  • H&K HK 45/45C/USP/USPC/P2000 Slide Release Spring

    H&K HK 45/45C/USP/USPC/P2000 Slide Release Spring

    H&K Heckler & Koch

    $9.95
    HK Slide Release Spring This is a high-wear item, as it cannot be reused once damaged or removed. It must be replaced with a new spring. Compatible With: HK USP 9mm, .40 & .45 HK USP Compact 9mm, .40 & .45 HK USP Tactical, Elite & Expert...
    HKP-01260
    $9.95
    Qty in Cart: 0
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    $9.95
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  • H&K HK MR556/416 Buffer Retaining Pin

    H&K HK MR556/416 Buffer Retaining Pin

    H&K Heckler & Koch

    $15.95
    HK 416 & MR556 Buffer Retaining Pin New HK German proprietary HK designed buffer pin unique to the HK 416 and MR 556 series.  Compatible With: HK MR556 HK 416 HK M27
    HKP-02544
    $15.95
    Qty in Cart: 0
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    $15.95
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  • H&K -4 Roller For Bolt Head 7.96mm - Under-sized H&K -4 Roller For Bolt Head 7.96mm - Under-sized

    H&K -4 Roller For Bolt Head 7.96mm - Under-sized

    H&K Heckler & Koch

    $27.99
    H&K -4 Roller For Bolt Head 7.96mm - Under-sized The proper roller size is essential for proper head spacing and bolt gap. New HK German not surplus or used goods. German-made -4 roller, each roller is priced per roller.
    HKP-00504
    $27.99
    Qty in Cart: 0
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    $27.99
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  • HKP Roller +5 - New - 8.05mm HKP Roller +5 - New - 8.05mm

    HKP Roller +5 - New - 8.05mm

    HKP HK Parts

    $8.99
    Roller +5 - New - 8.05mm HK Parts Standard (8.05 mm) locking roller, The proper roller size is essential for proper bolt gap. US Manufacture. Price is per roller.**You need to order two for a complete set (pair) for bolt head.**
    HKP-19440
    $8.99
    Qty in Cart: 0
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  • H&K G36K Gas Piston Rod/Spring Assembly

    H&K G36K Gas Piston Rod/Spring Assembly

    H&K Heckler & Koch

    $89.95
    New HK German G36K Gas Piston Rod/Spring Assembly Great for spare parts or to use on that HK SL8-G36 conversion.  
    HKP-00284
    $89.95
    Qty in Cart: 0
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    $89.95
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  • H&K HK G36, HK SL8 Ambidextrous Sling Pin

    H&K HK G36, HK SL8 Ambidextrous Sling Pin

    H&K Heckler & Koch

    $49.95
    HK German G36/SL8 Ambidextrous Sling Pin This part replaces all of the HK SL8 or G36 push pins with a loop for the sling. This can be moved to attach a sling on either the left or right sides with ease.
    HKP-00619
    $49.95
    Qty in Cart: 0
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  • H&K UMP/USC (.40 S&W/.45 ACP/9mm) Recoil Buffer

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

    H&K Heckler & Koch

    $20.95
    HK German USC & UMP Recoil Buffer Replaceable spare lower housing or buffer for buffer housings. This is a high wear and replacement item and a must-have for spare parts. Compatible With: HK USC .45 HK UMP models
    HKP-00594
    $20.95
    Qty in Cart: 0
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  • HK G36/SL8 (5.56/.223) Factory Recoil Buffer

    HK G36/SL8 (5.56/.223) Factory Recoil Buffer

    USA

    $16.95
    HK G36 Or SL8 Factory Recoil Buffer A must have spare part as the buffer is prone to wear and breakage. Compatible With: All HK G36 models SL8 models Clones
    HKP-18541
    $16.95
    Qty in Cart: 0
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    $16.95
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  • Out Of Stock
    Tac Latch - PTR Spec Tac Latch - PTR Spec

    Tac Latch - PTR Spec

    $69.95
    Tac Latch (latest Generation) PTR Spec - PTR .308 Firearms The new updated style of Tac latch is made specifically for the PTR 91 .308 receiver and will require very little modification to the firearm for installation. A major overhaul of the existing...
    HKP-17611
    $69.95
    Qty in Cart: 0
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    $69.95
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