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 MP5/SP5/MP5K/SP5K 9mm Extractor Spring H&K MP5/SP5/MP5K/SP5K 9mm Extractor Spring

    H&K MP5/SP5/MP5K/SP5K 9mm Extractor Spring

    H&K Heckler & Koch

    $9.95
    H&K MP5, SP5, MP5K, & SP5K 9mm Extractor Spring This extractor spring will fit all of the 9mm HK variants including clones. This part is German HK factory manufactured and made to the tightest of specifications and tolerances and will provide a...
    HKP-00055
    $9.95
    Qty in Cart: 0
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  • FMP MP5, MP5K Extractor Spring FMP MP5, MP5K Extractor Spring

    FMP MP5, MP5K Extractor Spring

    FMP

    $4.95
    FMP MP5, MP5K Extractor Spring New old stock HK contract FMP extractor spring will fit all of the 9mm HK variants including clones. This part was made using HK prints on HK contract tooling that the German HK factory manufactured for the Portuguese...
    HKP-18201
    $4.95
    Qty in Cart: 0
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  • H&K Rifle Extractor Spring For All HK's H&K Rifle Extractor Spring For All HK's

    H&K Rifle Extractor Spring For All HK's

    H&K Heckler & Koch

    $6.74
    HK German 308/7.62 & 556/.223 Rifle Extractor Spring New factory HK German part. The extractor spring is the number 1 replaced item on HK firearms. Many HK gunsmiths recommend upgrading MP5/94 series HK's with this longer/stronger silver spring vs...
    HKP-00188
    $6.74
    Qty in Cart: 0
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  • H&K Small Push Pin - Forearm & Lower

    H&K Small Push Pin - Forearm & Lower

    H&K Heckler & Koch

    $8.95
    H&K Small Push Pin - Forearm & Lower All steel HK German small push pin for use on the lower grip housing. The small push pin is also the correct pin for holding the HK forearm in place. Compatible With: HK91, G3, PTR HK93, 33, 53 HK MP5, 94,...
    HKP-00075
    $8.95
    Qty in Cart: 0
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  • H&K Roller Retainer Spring - Action 3 H&K Roller Retainer Spring - Action 3

    H&K Roller Retainer Spring - Action 3

    H&K Heckler & Koch

    $6.74
    H&K Roller Retainer Spring - Action 3 This part is the second-generation roller holder. Each retainer fits all "action 3" 9mm MP5 & MP5K bolt heads & MP5 40/10 bolt heads. The roller retainer spring is a common repair and replacement item and...
    HKP-00068
    $6.74
    Qty in Cart: 0
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  • H&K Ejector Lever Spring H&K Ejector Lever Spring

    H&K Ejector Lever Spring

    H&K Heckler & Koch

    $6.95
    H&K Ejector Lever Spring The new HK German factory ejector lever spring fits all HK 90 series of rifles and pistols. This is a common repair and replacement part and it is a recommended spare part for every HK enthusiast or shooter. Compatible...
    HKP-00059
    $6.95
    Qty in Cart: 0
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  • HKP 1st Gen Roller Retainer Plate To Spring Upgrade

    HKP 1st Gen Roller Retainer Plate To Spring Upgrade

    HKP HK Parts

    $9.95
    HKP 1st Gen Roller Retainer Plate To Spring Upgrade This action 3 roller retainer spring for all 1st Generation bolt heads replaces the oval-shaped roller retainer plate. HK made a wire spring as an upgrade for later production bolt heads to improve the...
    HKP-02119
    $9.95
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  • HKP Small Push Pin - Forearm & Lower HKP Small Push Pin - Forearm & Lower

    HKP Small Push Pin - Forearm & Lower

    USA

    $6.95
    HK Small push pin - US MAde All steel small push pin for use on the lower grip housing for a push pin style of lower housing. Black nitride finish which adds extra durability to the pin plus corrosion and abrasion resistance. The small push pin is also...
    HKP-20397
    $6.95
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  • H&K 9mm Ejector Lever - 3rd Gen H&K 9mm Ejector Lever - 3rd Gen

    H&K 9mm Ejector Lever - 3rd Gen

    H&K Heckler & Koch

    $69.95
    H&K 9mm Ejector Lever - Latest Generation  The German latest generation ejector has all of the upgrades and improvements made since the MP5 was introduced over 50 years ago. Fits all of the HK 9mm variants. Stamped, formed, heat treated,...
    HKP-00058
    $69.95
    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
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  • H&K HK German Roll Pin

    H&K HK German Roll Pin

    H&K Heckler & Koch

    $2.95
    HK German Roll Pin German HK roll pin is crafted from a process using rolled spring steel resulting in robust part with stable fitment. HK suggests replacing the roll pin with a new unit each time it is removed. Fits and retains the extractor, mag...
    HKP-01921
    $2.95
    Qty in Cart: 0
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  • HKP MP5 Replacement Buffer for Folding Stock or End Cap HKP MP5 Replacement Buffer for Folding Stock or End Cap

    HKP MP5 Replacement Buffer for Folding Stock or End Cap

    HKP HK Parts

    $3.49
    HKP MP5 Replacement Buffer for Folding Stock or End Cap Spare replacement buffer for choate folding stocks or end caps. Compatible With: Choate MP5 and MP5K Stocks or End Caps (NOT compatible with MP5 .22 LR)
    HKP-18735
    $3.49
    Qty in Cart: 0
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  • H&K HK USP/P/45 Enhanced Match Flat Sear Spring H&K HK USP/P/45 Enhanced Match Flat Sear Spring

    H&K HK USP/P/45 Enhanced Match Flat Sear Spring

    H&K Heckler & Koch

    $9.95
    Enhanced Match Flat Sear Spring The nickel-plated sear spring is also regarded as a "match" flat spring as it will improve the feel and "smoothness" when pulling the trigger as it takes up some of the gritty feel. It is a must-have upgraded part to...
    HKP-01811
    $9.95
    Qty in Cart: 0
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  • H&K 90 Series Butt Stock Push Pin

    H&K 90 Series Butt Stock Push Pin

    H&K Heckler & Koch

    $3.95
    H&K 90 Series Butt Stock Push Pin Each large stock push pin is used to retain the stock to the receiver on the 90 series of firearms. Large push pins are for the stock and the small push pin is for the forearm and lower. The HK German genuine push...
    HKP-18038
    $3.95
    Qty in Cart: 0
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  • HK German Butt Stock Push Pin HK German Butt Stock Push Pin

    HK German Butt Stock Push Pin

    H&K Heckler & Koch

    $8.95
    HK German Butt Stock Push Pin Each large stock push pin is used to retain the stock to the receiver on the 90 series of firearms. These are great replacement or spare parts to keep on hand as they fit all of the 90-series firearms below. The large push...
    HKP-00076
    $8.95
    Qty in Cart: 0
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  • US Ejector Lever Axle US Ejector Lever Axle

    US Ejector Lever Axle

    HKP HK Parts

    $6.95
    US Ejector Lever Axle This US ejector lever axle pin holds the ejector lever in place in the trigger pack. Made out to HK spec for the best US replacement part on the market. The best replacement for your worn out or broken axle. A must have replacement...
    HKP-20630
    $6.95
    Qty in Cart: 0
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  • FMP Rifle Extractor Spring For All HK's - HK Contract FMP FMP Rifle Extractor Spring For All HK's - HK Contract FMP

    FMP Rifle Extractor Spring For All HK's - HK Contract FMP

    FMP

    $3.49
    HK Contract FMP (Portuguese) 308/7.62, 5.56/.223 Rifle Extractor Spring New factory contract part. The extractor spring is the number 1 replaced item on HK firearms. Many HK gunsmiths recommend upgrading MP5/94 series HK's with this longer/stronger...
    HKP-16248
    $3.49
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  • HKP HK USP/P30/P2000 Light Hammer Spring HKP HK USP/P30/P2000 Light Hammer Spring

    HKP HK USP/P30/P2000 Light Hammer Spring

    HKP HK Parts

    $8.95
    HKP HK USP/P30/P2000 Light Hammer Spring Finally a New US Production 10 lb. Hammer Spring For HK USP, P30 & P2000. Brought about by many customers asking for a 2 lb. lighter hammer spring than stock (12 lb.). This is also a popular hammer spring used...
    HKP-16489
    $8.95
    Qty in Cart: 0
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  • HKP HK VP9/VP9SK, HK VP40 Ultra Match Spring Set HKP HK VP9/VP9SK, HK VP40 Ultra Match Spring Set

    HKP HK VP9/VP9SK, HK VP40 Ultra Match Spring Set

    HKP HK Parts

    $19.95
    HKP HK VP9/VP9SK, HK VP40 Ultra Match Spring Set Ultra Match drop-in spring kit will give your VP9, VP40 an even smoother, crisper, and lighter pull that helps promote consistent match-grade accuracy, and control, by dropping the trigger pull of your...
    HKP-17222
    $19.95
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  • H&K German Roller Retainer Plate For Rollers H&K German Roller Retainer Plate For Rollers

    H&K German Roller Retainer Plate For Rollers

    H&K Heckler & Koch

    $2.74
    HK German Roller Retainer Plate For All Rollers - Used This item is a common wear item that is great to have on hand as they are one of the top items that break or fail with the use and age of the service weapon.  Compatible With All Original 1st...
    HKP-02690
    $2.74
    Qty in Cart: 0
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  • Lazy Wolf HK VP/P30/USP/HK45 Enhanced Firing Pin Block Spring

    Lazy Wolf HK VP/P30/USP/HK45 Enhanced Firing Pin Block Spring

    Lazy Wolf

    $9.95
    Lazy Wolf HK VP/P30/USP/HK45 Enhanced Firing Pin Block Spring An exciting and desirable new offering as a joint collaboration from the widely renowned Master HK pistol smith Lazy Wolf Guns & HK Parts! This spring was designed by master pistol smith...
    HKP-18110
    $9.95
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  • H&K 93/53/91/G3 Cocking Handle Spring

    H&K 93/53/91/G3 Cocking Handle Spring

    H&K Heckler & Koch

    $5.74
    New Style Cocking Handle Lever Spring - German   This is the latest HK German spring design with the factory HK anti-corrosion plating applied. The factory HK springs last longer and is more tolerant to corrosion. A perfect upgrade for your older...
    HKP-00348
    $5.74
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  • H&K Roller Retainer Pin - New Style H&K Roller Retainer Pin - New Style

    H&K Roller Retainer Pin - New Style

    H&K Heckler & Koch

    $6.95
    HK Roller Retainer Pin, Clamping Sleeve- New Style This part works with all roller retainer plates and springs. HK started this change of roller retainer pins starting in all 2011-produced bolt heads. Works with all styles of roller retainer plates...
    HKP-01954
    $6.95
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  • H&K HK Barrel O-Ring .45 ACP Caliber Pistols - Black H&K HK Barrel O-Ring .45 ACP Caliber Pistols - Black

    H&K HK Barrel O-Ring .45 ACP Caliber Pistols - Black

    H&K Heckler & Koch

    $4.95
    H&K HK Barrel O-Ring .45 ACP Caliber Pistols - Black A great spare and a much-needed part for your HK barrel. This factory part is a high-wear item, as the O-ring provides the seal between the slide and the barrel, which provides a secure lockup with...
    HKP-00296
    $4.95
    Qty in Cart: 0
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  • HK, Walther, Colt, .22LR Barrel Adapter O-Ring HK, Walther, Colt, .22LR Barrel Adapter O-Ring

    HK, Walther, Colt, .22LR Barrel Adapter O-Ring

    USA

    $2.95
    H&K, Walther, Colt, .22LR Barrel Adapter O-Ring Made from the highest quality & very durable Viton material. The O-ring on the adapter can tear with use or become brittle over time. Be sure to grab a few extra rings with your adapter to ensure...
    HKP-17379
    $2.95
    Qty in Cart: 0
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    $2.95
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  • Lazy Wolf HK Reduced Power Hammer Spring - 11 lb.

    Lazy Wolf HK Reduced Power Hammer Spring - 11 lb.

    Lazy Wolf

    $9.95
    Lazy Wolf HK Reduced Power Hammer Spring - 11 lb. An exciting new offering as a joint collaboration from the widely renowned pistol smith Lazy Wolf Guns & HK Parts! This custom spring was designed exclusively by master trigger smith Rick Holm at LWG...
    HKP-18147
    $9.95
    Qty in Cart: 0
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  • H&K HK P9/P9S Recoil Buffer

    H&K HK P9/P9S Recoil Buffer

    HKP HK Parts

    $19.95
    HK P9S Recoil Buffer Fits All 9mm & 45 P9 & P9S Models This is a must-have replacement item as the buffer will degrade and fall apart with use and age. Replacing the P9 buffer is the most common wear and replacement part on the P9 series of...
    HKP-01449
    $19.95
    Qty in Cart: 0
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  • H&K Locking Roller Pin For Bolt Heads H&K Locking Roller Pin For Bolt Heads

    H&K Locking Roller Pin For Bolt Heads

    H&K Heckler & Koch

    $6.95
    H&K Locking Roller Pin For Bolt Heads   HK roller retainer pin or clamping sleeve (holds roller retainer plate in place). Each retainer pin works with all roller retainer plates & springs. All 3 types including oval-shaped roller retainer...
    HKP-00066
    $6.95
    Qty in Cart: 0
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  • H&K HK 45/45C/USP/P30 New Style Light Firing Pin Block Spring H&K HK 45/45C/USP/P30 New Style Light Firing Pin Block Spring

    H&K HK 45/45C/USP/P30 New Style Light Firing Pin Block Spring

    H&K Heckler & Koch

    $7.74
    H&K HK 45/45C/USP/P30 New Style Light Firing Pin Block Spring This part is commonly used with the light trigger return spring (shown below) for a light trigger pull conversion. This spring is one of the springs used to convert P2000,...
    HKP-01955
    $7.74
    Qty in Cart: 0
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  • PTR Semi Auto Spacer With Elbow Spring - Match Grade PTR Semi Auto Spacer With Elbow Spring - Match Grade

    PTR Semi Auto Spacer With Elbow Spring - Match Grade

    PTR

    $11.95
    PTR Semi Auto Spacer With Elbow Spring - Match Grade   For use on all HK semi-auto trigger packs. It's a must-have for those converting a full auto trigger pack to semi-auto. This unit provides a "match" grade feel to your trigger pull. 
    HKP-00838
    $11.95
    Qty in Cart: 0
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    $11.95
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  • H&K MP5/K Bolt Group Backup Kit - Action 3

    H&K MP5/K Bolt Group Backup Kit - Action 3

    H&K Heckler & Koch

    $22.95
    H&K MP5 Bolt Group Backup Kit - Action 3 This kit includes the highest wear and replace items on the MP5 action 3 bolt group, as well as the easy to lose pin. Includes: Factory German MP5 9mm Extractor Spring Factory German Action 3 Roller Retainer...
    HKP-16993
    $22.95
    Qty in Cart: 0
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  • HKP HK 91/93/33/53/G3 (5.56/.223) & (7.62x51/.308) Hex Buffer Screw - Front

    HKP HK 91/93/33/53/G3 (5.56/.223) & (7.62x51/.308) Hex Buffer Screw - Front

    HKP HK Parts

    $0.69
    Enhanced Hex Style Buffer Screw New upgraded hex head style front buffer screw. Each buffer assembly uses 2 of these screws to affix the buffer to the back plate and central stock section. The old style buffer screws were used the older slotted head and...
    HKP-17883
    $0.69
    Qty in Cart: 0
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    $0.69
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  • Lazy Wolf HK Reduced Power Hammer Spring - 10 lb.

    Lazy Wolf HK Reduced Power Hammer Spring - 10 lb.

    Lazy Wolf

    $9.95
    Lazy Wolf HK Reduced Power Hammer Spring - 10 lb. An exciting new offering as a joint collaboration from the widely renowned pistol smith Lazy Wolf Guns & HK Parts! This custom spring was designed exclusively by master trigger smith Rick Holm at LWG...
    HKP-18132
    $9.95
    Qty in Cart: 0
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  • H&K Oversized Barrel Retaining Pin - 5.25mm

    H&K Oversized Barrel Retaining Pin - 5.25mm

    H&K Heckler & Koch

    $9.95
    H&K Oversized Barrel Retaining Pin - 5.25mm This is the barrel pin used for installing a new or replacement barrel. HK suggests using a new factory barrel pin when installing or reinstalling an HK barrel in the trunnion. Each pin is slightly...
    HKP-16954
    $9.95
    Qty in Cart: 0
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  • H&K HK MR556/416 Gas Block Roll Pin

    H&K HK MR556/416 Gas Block Roll Pin

    H&K Heckler & Koch

    $7.95
    HK 416 & MR556 Gas Block Pin This is the retaining pin for an HK 416 gas block. A must-have, as HK recommends using new pins once they are removed or damaged.  Size: 5 x 18 mm.
    HKP-02534
    $7.95
    Qty in Cart: 0
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  • DTAC Mag Paddle Bushing With Pin For Semi Builds DTAC Mag Paddle Bushing With Pin For Semi Builds

    DTAC Mag Paddle Bushing With Pin For Semi Builds

    DTAC Dakota Tactical

    $9.89
    DTAC Mag Paddle Bushing With Pin For Semi-Builds This part is made 100% in the US from 17-4 stainless steel. Latest production with patent pending anti-binding enhancement upgrade. Accurate tolerance for easy movement with minimal play. It has an...
    HKP-02194
    $9.89
    Qty in Cart: 0
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  • H&K GSG-5 Push Pin Upgrade Kit H&K GSG-5 Push Pin Upgrade Kit

    H&K GSG-5 Push Pin Upgrade Kit

    H&K Heckler & Koch

    $29.95
    H&K GSG-5 Push Pin Upgrade Kit This item is a set of genuine HK German factory push pins that will upgrade all your GSG-5 rifles or pistols to quick take-down push pins. This is one of the most common and desirable upgrades available for your GSG5...
    HKP-01064
    $29.95
    Qty in Cart: 0
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  • H&K 91/93/33/53/G3 (5.56/ 223) & (7.62x51/.308) Buffer Screw Locking Washer - Zinc Plated H&K 91/93/33/53/G3 (5.56/ 223) & (7.62x51/.308) Buffer Screw Locking Washer - Zinc Plated

    H&K 91/93/33/53/G3 (5.56/ 223) & (7.62x51/.308) Buffer Screw Locking Washer - Zinc Plated

    H&K Heckler & Koch

    $0.25
    HK G3, 91, PTR & HK93, 33, 53 - Locking Washer For Small Buffer Screws New not surplus latest generation of G3, 91, PTR toothed locking washer. Zinc plated (galvanized) as to not corrode or rust like the older style units found on surplus stocks...
    HKP-17882
    $0.25
    Qty in Cart: 0
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    $0.25
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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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  • Grayguns HK USP, HK45 Short Reset System

    Grayguns HK USP, HK45 Short Reset System

    Grayguns

    $90.00
    Grayguns HK USP, HK45 Short Reset System This Short Reset System for the HK USP and HK45 replicates the short reset conversion available at Grayguns. Cut from bar stock steel, these kits provide an exacting fit for easy install. The kit shortens the...
    HKP-19753
    $90.00
    Qty in Cart: 0
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    $90.00
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