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 Heckler & Koch
$9.95H&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 -
FMP MP5, MP5K Extractor Spring
FMP
$4.95FMP 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 -
H&K Rifle Extractor Spring For All HK's
H&K Heckler & Koch
$6.74HK 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 -
H&K Small Push Pin - Forearm & Lower
H&K Heckler & Koch
$8.95H&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 -
H&K Roller Retainer Spring - Action 3
H&K Heckler & Koch
$6.74H&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 -
H&K Ejector Lever Spring
H&K Heckler & Koch
$6.95H&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 -
HKP 1st Gen Roller Retainer Plate To Spring Upgrade
HKP HK Parts
$9.95HKP 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 -
HKP Small Push Pin - Forearm & Lower
USA
$6.95HK 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 -
H&K 9mm Ejector Lever - 3rd Gen
H&K Heckler & Koch
$69.95H&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 -
HKP MP5 Replacement Buffer for Folding Stock or End Cap
HKP HK Parts
$3.49HKP 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 -
H&K HK USP/P/45 Enhanced Match Flat Sear Spring
H&K Heckler & Koch
$9.95Enhanced 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 -
H&K 90 Series Butt Stock Push Pin
H&K Heckler & Koch
$3.95H&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 -
HK German Butt Stock Push Pin
H&K Heckler & Koch
$8.95HK 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 -
FMP Rifle Extractor Spring For All HK's - HK Contract FMP
FMP
$3.49HK 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 -
US Ejector Lever Axle
HKP HK Parts
$6.95US 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 -
HKP HK USP/P30/P2000 Light Hammer Spring
HKP HK Parts
$8.95HKP 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 -
Lazy Wolf HK VP/P/USP/45 Enhanced Firing Pin Block Spring
Lazy Wolf
$9.95Lazy Wolf HK VP/P/USP/45 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 Rick...HKP-18110$9.95 -
H&K 93/53/91/G3 Cocking Handle Spring
H&K Heckler & Koch
$5.74New 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 -
HK, Walther, Colt, .22LR Barrel Adapter O-Ring
USA
$2.95H&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 -
Lazy Wolf HK Reduced Power Hammer Spring - 11 lb.
Lazy Wolf
$9.95Lazy 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 -
H&K HK 45/45C/USP/P New Style Light Firing Pin Block Spring
H&K Heckler & Koch
$7.74HK 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, P2000SK, and P30 to...HKP-01955$7.74 -
PTR Semi Auto Spacer With Elbow Spring - Match Grade
PTR
$11.95PTR 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 -
HKP HK 91/93/33/53/G3 (5.56/.223) & (7.62x51/.308) Hex Buffer Screw - Front
HKP HK Parts
$0.69Enhanced 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 -
H&K MP5/K Bolt Group Backup Kit - Action 3
H&K Heckler & Koch
$22.95H&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 -
H&K Oversized Barrel Retaining Pin - 5.25mm
H&K Heckler & Koch
$9.95H&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 -
H&K HK MR556/416 Gas Block Roll Pin
H&K Heckler & Koch
$7.95HK 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 -
Lazy Wolf HK Reduced Power Hammer Spring - 10 lb.
Lazy Wolf
$9.95Lazy 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 -
DTAC Mag Paddle Bushing With Pin For Semi Builds
DTAC Dakota Tactical
$9.89DTAC 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 -
H&K GSG-5 Push Pin Upgrade Kit
H&K Heckler & Koch
$29.95H&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 -
H&K 91/93/33/53/G3 (5.56/ 223) & (7.62x51/.308) Buffer Screw Locking Washer - Zinc Plated
H&K Heckler & Koch
$0.25HK 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 -
HKP Rear Sight Oval Washer
HKP HK Parts
$2.95HKP 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 -
Grayguns HK USP, HK45 Short Reset System
Grayguns
$90.00Grayguns 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 -
H&K Push Pin Set - MP5, G3/91, 33/53/93
H&K Heckler & Koch
$15.49HK Set Of Two (One Large And One Small) Push Pins -Used These are great replacements or spare parts to keep on hand. Compatible With: HK91 & G3 53, 33, and 93 MP5, SP5, SP89 PTR and GSG-5 family of guns. Please Note: The GSG5 will take...HKP-00673$15.49 -
HKP MP5 & HK94 Firing Pin Spring - Enhanced
HKP HK Parts
$4.95MP5 & 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 -
HKP MP5SD Sealing Ring - Enhanced
HKP HK Parts
$9.95HKP 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 -
HKP Recoil Rod Guide Ring For Recoil Rod Assemblies - Enhanced
HKP HK Parts
$2.39HKP 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 -
H&K MP5 & HK94 Firing Pin Spring
H&K Heckler & Koch
$9.95HK 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 -
H&K HK Pistol Match Trigger Return Spring
H&K Heckler & Koch
$8.95HK 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 -
H&K HK MR556/416 Enhanced Buffer Spring
H&K Heckler & Koch
$19.95Enhanced 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 & M16HKP-00039$19.95 -
H&K HK VP9/VP9SK/P30/45 Clamping Pin Backstrap
H&K Heckler & Koch
$5.95Dowel 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 VP9SKHKP-01810$5.95