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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PTR Tactical Handguard "U" Shaped Bracket Screw
PTR
$1.95PTR Tactical Handguard "U" Shaped Bracket Screw Replacement screw for the "U" shaped hangar on the tactical handguard. There are a total of 3 screws used, they are all the same for the MP5k, MP5, HK93 & HK91 tactical handguards. Great spare to have...HKP-17318$1.95 -
Out Of Stock
Surefire HK MR556/416 3-Prong Flash Hider - Threaded 1/2x28
Surefire
$174.95Surefire HK MR556/416 3-Prong Flash Hider - Threaded 1/2x28 The flash hider is engineered for M4/M16 and variants with 1/2x28 muzzle threads. Its patent-pending design reduces muzzle flash by over 99% compared to a plain muzzle. Built from US...HKP-17261$174.95 -
B&T HK UMP (.40 S&W & .45 ACP) Birdcage Flash Hider
B&T Brugger & Thomet
$99.95B&T HK UMP (.40 S&W & .45 ACP) Birdcage Flash Hider B&T muzzle brake/flash hider birdcage style with quick detach lever for HK UMP .40 S&W & .45 ACP. Swiss made B&T quick detach flash hider for HK UMP .40 and .45ACP...HKP-16890$99.95 -
H&K HK 416 Enhanced Firing Pin/Retaining Pin
H&K Heckler & Koch
$19.95HK 416 Firing Pin Retaining Pin- New Style This part is the newer style pin that is goldish, super hardened, and much less prone to wear and tear. The enhanced version is the most robust, easiest-to-use pin available. Compatible With: HK 416 AR15, M4...HKP-02658$19.95 -
H&K HK MR556/416 Handguard Rail System Screw
H&K Heckler & Koch
$29.95HK MR556 & HK 416 Handguard Rail System Screw This is the hex head version for any metric Allen hex head that can be utilized to tighten and release the screw pressure. This can also be used to replace the rail screw on...HKP-02717$29.95 -
Walther 20 Round UZI .22 Magazine Spring
Walther
$3.95Walther 20 Round UZI .22 Magazine Spring Uzi .22LR 20 round magazine spring for the Uzi, Walther, Umarex .22 pistol. A good supply of spare mag springs is a must. These are ideal to have on hand as the spring can become damaged or worn out. New fresh...HKP-15592$3.95 -
H&K HK P7M10/P7M13 Retaining Pin
H&K Heckler & Koch
$4.95H&K HK P7M10/P7M13 Retaining PinHKP-16436$4.95 -
HKP HK45 .45 ACP Thread Protector - Threaded .578x28 RH
HKP HK Parts
$19.95HKP HK45 .45 ACP Thread Protector - Threaded .578x28 RH The new US-made .45 ACP tactical thread protector, the cap fits all HK45 full size & compact barrels threaded .578x28 RH thread. A must have item to protect your threaded barrels & exposed...HKP-19514$19.95 -
GSG9 HK G36/SL8 (5.56/.223) Forearm, Lower, Magwell - Push Pin
GSG9
$21.95HK 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 -
H&K Selector Catch Lever Spring For Ambidextrous Trigger Packs
H&K Heckler & Koch
$12.95HK German Ambidextrous Trigger Pack Axle Spring For Catch Lever This is the spring that powers the ambi lever that allows you to take apart any of the ambidextrous trigger packs. This lever spring takes the spring tension off of the left and right side...HKP-17328$12.95 -
H&K Grip Screw
H&K Heckler & Koch
$8.95H&K Grip Screw It is a new HK German part that is now out of production. Great to have as a spare. Compatible With: HK91 HK93 HK94 SP89HKP-01725$8.95 -
$8.95 -
HKP/H&K Mark 23 .45 ACP Knurled Micro Comp - Threaded 16x1 RH
HKP HK Parts
$29.95HKP/H&K Mark 23 .45 ACP Knurled Micro Comp - Threaded 16x1 RH The HK Parts Micro Comp & Thread Protector is a lightweight, fully functional accessory that serves as both a compensator and thread protector. Easily attaching to any factory spec...HKP-21328$29.95 -
H&K HK 45/45C/USP/USPC/P2000 Slide Release Spring
H&K Heckler & Koch
$9.95HK 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 -
H&K HK Mark 23 Extractor Spring
H&K Heckler & Koch
$8.95Extractor Spring For HK Mark 23 Or SOCOM Pistol New HK German factory nickel-plated extractor spring. A great spare to have on hand and one of the highest wear and replacement parts on the Mark 23. Compatible with all models and years of the Mark 23...HKP-01430$8.95 -
H&K HK MR556/HK416 FFRS Retaining Spring
H&K Heckler & Koch
$7.99H&K 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 have to be...HKP-02617$7.99 -
H&K MP5F, MP5 40,10 Factory Recoil Spring
H&K Heckler & Koch
$14.95HK German MP5 F 9mm & MP5 40/10 Recoil Spring - New Updated Version New latest HK German manufacture MP5 40/10 replacement recoil spring. Hard to find and a high wear and replacement item. Each spring replaces the MP5F recoil spring for the MP5 9mm...HKP-01061$14.95 -
H&K UMP/USC (.40 S&W/.45 ACP/9mm) Firing Pin Spring
H&K Heckler & Koch
$9.95New HK German USC & UMP Firing Pin Spring This is a common wear and breakage item. This item also frequently becomes lost by end users when field stripping the UMP and USC Bolts. Compatible with all HK UMP & USC riflesHKP-00262$9.95 -
H&K UMP/G36 (.40 S&W/.45 ACP/9mm/5.56/.223) Sear Spring
H&K Heckler & Koch
$8.95HK UMP, USC, G36, & SL8 Sear Spring This part is used in conjunction with the sear in the trigger body of the lower.HKP-01866$8.95 -
HKP/H&K Mark 23 .45 ACP Vented Micro Comp - Threaded 16x1 RH
HKP HK Parts
$29.95HKP/H&K Mark 23 .45 ACP Vented Micro Comp - Threaded 16x1 RH The HK Parts Micro Comp & Thread Protector is a lightweight, dual-purpose accessory that functions as both a compensator and thread protector. Designed for easy attachment to any...HKP-21329$29.95 -
Sale
HKP/H&K VP9 Tactical 9mm Micro Comp - Threaded 1/2x28
HKP HK Parts
Now: $39.95Was: $49.95HKP/H&K VP9 Tactical 9mm Micro Comp - Threaded 1/2x28 Enhance your HK P30, P30L, VP9 or VP9 Tactical 9mm with this precision-engineered Micro Compensator. Threaded 1/2x28, this micro comp is designed to reduce recoil and muzzle rise,...HKP-18029Now: $39.95Was: $49.95 -
H&K 91/G3 (7.62x51/.308) Firing Pin Spring - Used
H&K Heckler & Koch
$4.95H&K 91/G3 (7.62x51/.308) Firing Pin Spring - Used This is a common repair and replacement item. Great for spares as this is a common breakage part.HKP-16711$4.95 -
H&K HK P2000/P30/USP Heavy Firing Pin Block Spring
H&K Heckler & Koch
$9.95HK P2000 & P30 Heavy Firing Pin Block Spring This is the heavy LEM spring found on the LEM conversion. Compatible With: Any post-2005 production USP & UPSC P2000 P2000SK P30 P30SK Will fit the HK45 & HK45C modelsHKP-01603$9.95 -
H&K UMP/USC (.40 S&W/.45 ACP/9mm) Magazine Release Spring
H&K Heckler & Koch
$9.95HK UMP & USC Magazine Release Spring HK German factory mag release spring for all USC and UMP mag releases. Compatible With: USC lowers UMP lowersHKP-01899$9.95 -
HKP .40 S&W Micro Comp - Threaded 14.5x1 LH
HKP HK Parts
$29.95HKP .40 S&W Micro Comp - Threaded 14.5x1 LH The HK Parts Micro Comp & Thread Protector is a lightweight, dual-function device serving as both a compensator and thread protector. It attaches easily to any factory-spec 14.5x1 LH .40 S&W barrel,...HKP-19954$29.95 -
B&T .45 ACP Flash Hider - 3-Lug
B&T Brugger & Thomet
$164.95B&T .45 ACP Flash Hider - 3-Lug B&T Switzerland has supplied these to law enforcement and military units around the world. Rock solid, mil-spec quality from an H&K OEM manufacturer. This flash hider slips over the end of the 3-lug barrel and...HKP-18346$164.95 -
H&K HK 45/P30/P2000/USPC Recoil Spring Washer Retainer
H&K Heckler & Koch
$4.95HK 45, P30, P2000, & USPC Recoil Spring Washer Retainer This disk supports and keeps the recoil spring centered and captive on the recoil rod itself. Compatible With: HK45, HK45 Tactical HK45 Compact, HK45 Compact Tactical USP Compact, USP...HKP-02428$4.95 -
H&K HK P30/45/USP/USPC/P2000 Hammer Spring
H&K Heckler & Koch
$9.95Hammer Spring This is the stock hammer spring for many P30 models and is used for the heavy TGS and heavy and light LEM conversions on the USP, USPC, P30 & HK45 models. Compatible With: USP Full Size LEM & V4 USP Compact LEM &...HKP-01804$9.95 -
HKP MP5K 9mm Trunnion
HKP HK Parts
$57.95HK MP5K Trunnion - USA US made to exact factory HK specifications for the HK MP5K type builds. Machined completely from ordnance grade steel and heat treated to factory specs. These are the best USA made trunnions on the market. Machined to HK spec...HKP-17964$57.95 -
H&K 93/53/33 (5.56/.223) Firing Pin Spring
H&K Heckler & Koch
$9.95New 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 HK33 HK53 V93/V53, C93, C53 Custom builds and clonesHKP-00193$9.95 -
H&K Claw Mount Screw For Optics & Rails
H&K Heckler & Koch
$3.95H&K Claw Mount Screw For Optics & Rails HK German rail screw that is used on the HK claw mount to add an optic such as a Hendsoldt or Stanag optic to the claw mount. The screw is used German surplus manufacture but in perfect shape for use on all...HKP-17921$3.95 -
H&K UMP/USC/G36/SL8 (.40 S&W/.45 ACP/9mm/5.56/.223) Ambidextrous Sling Loop
H&K Heckler & Koch
$40.95UMP, USC, SL8, & G36 Ambidextrous Sling Loop Or Eyebolt For Sling - German HK The addition of the HK eyelet creates a sling attachment point that will enable you to mount a sling using any of the hard mounting points located on the forearm of the...HKP-00611$40.95 -
HKP .45 ACP 5 Prong Flash Suppressor - Threaded 16x1 LH
HKP HK Parts
$99.95HKP .45 ACP 5 Prong Flash Suppressor - Threaded 16x1 LH This is the much anticipated 5-prong flash hider. This flash suppressor is ideal for your USP tactical pistol. It enhances accuracy by up to 35%, reduces recoil by up to 40%, and there is...HKP-02637$99.95 -
HKP HK45 .45 ACP Knurled Micro Comp - Threaded .578x28 RH
HKP HK Parts
$29.95HKP HK45 .45 ACP Knurled Micro Comp - Threaded .578x28 RH This new .45 ACP Tactical Slotted Micro Comp fits all HK-spec .45 ACP full-size and compact barrels threaded .578x28 RH. Designed to be lightweight and fully functional as both a compensator and...HKP-21175$29.95 -
H&K Cocking Tube End Cap Spring
H&K Heckler & Koch
$4.95H&K Cocking Tube End Cap Spring Fits all German, Contract & US made cocking tube end caps. A great spare to have on hand as this part can become worn and be lost. The cocking tube end cap spring applies pressure to the cocking tube end cap/dust...HKP-17980$4.95 -
H&K G36K Gas Piston Rod/Spring Assembly
H&K Heckler & Koch
$89.95New 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 -
$7.95 -
H&K HK USP/45/45C Trigger Bar Detent Spring
H&K Heckler & Koch
$9.95H&K HK USP/45/45C Trigger Bar Detent Spring This is a common replacement part as it can become worn or lost. Compatible With The Newer Style HK45 & HK45C Models: HK45, HK45 Tactical HK45C, HK45C Tactical Compatible With The HK USP...HKP-01254$9.95 -
H&K Magazine Release Set
H&K Heckler & Koch
$184.95H&K Magazine Release Set This is the complete magazine release kit that includes both the paddle mag release and standard left-to-right mag release on your HK 9mm rifle or pistol build. Compatible With: MP5, MP5K style 9mm models Set...HKP-02402$184.95 -
H&K P30, HK45, USPC Recoil Spring
H&K Heckler & Koch
$18.95New HK German Pistol Recoil Spring This part is ideal for repair or a replacement item as this is a high-wear item. This spring is the factory-correct flat-style compression spring. Compatible With: HK 45C, HK45C Tactical HK USPC .45, USPC Tactical HK...HKP-01673$18.95