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 14.5x1 .40 S&W Tactical Thread Protector - Black
H&K Heckler & Koch
$24.95H&K 14.5x1 .40 S&W Tactical Thread Protector - Black Fits all HK barrels that are threaded 14.5x1 mm. This is the correct thread protector for all the HK .40 cal metric threaded barrels. This will also fit non-HK-related barrels as well that are...HKP-00298$24.95 -
H&K Burst Trigger Pack Compression Rod Spring
H&K Heckler & Koch
$10.95H&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...HKP-16199$10.95 -
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 -
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 -
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 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 -
HKP MP5 40/10 30 Round Magazine Spring
HKP HK Parts
$4.95HKP MP5 40/10 30 Round Magazine SpringHKP-16509$4.95 -
HKP MP5 40/10 Magazine Follower
HKP HK Parts
$9.95HKP MP5 40/10 Magazine Follower A perfect replacement part for all HK MP5 40/10 magazines. Also counts as one 922r compliant part.HKP-16506$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 HK 416/MR556/AR15 Selector Detent Spring
H&K Heckler & Koch
$9.95HK MR556 & HK 416 Selector Detent Spring HK German manufacture. Compatible With: HK MR556 HK416 AR15, M4 & M16HKP-02657$9.95 -
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 -
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 -
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 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 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 -
H&K Trigger Spring For Burst Trigger Packs
H&K Heckler & Koch
$8.95Burst Pack Trigger Spring - HK German New HK German trigger return spring used on all HK 90 series burst trigger packs. MP5, HK53, G3 burst, 2 or 3 round burst trigger packs.HKP-01450$8.95 -
HKP HK21 T-Rail Set - 7.62x51/.308
HKP HK Parts
$119.95HKP 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 FMP21HKP-21457$119.95 -
HK UMP/USC (.40 S&W/.45 ACP/9mm) Picatinney Rail Screw
$0.75HK UMP/USC (.40 S&W/.45 ACP/9mm) Picatinney Rail Screw Good spares to have on hand as screws can get damaged or lost.HKP-16562$0.75 -
H&K 30 Round HK MR556/K416 Magazine Spring
H&K Heckler & Koch
$12.95HK German HK MR556 & HK 416 Magazine SpringHKP-13483$12.95 -
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 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 HK MR762/417/G28 Handguard Rail System Screw - Black
H&K Heckler & Koch
$16.95HK MR762, HK 417 Factory Handguard Rail Screw Each MR762 takes and uses 2 retaining screws for the handguard. New HK German manufacture. Compatible With: HK MR762 HK 417 HK G28HKP-16601$16.95 -
H&K HK P7 Series Piston Plunger, Detent Spring
H&K Heckler & Koch
$7.95HK P7 Series Piston Plunger, Detent Spring Compatible With: PSP P7M8 P7M10 P7M13HKP-01327$7.95 -
H&K MP5K Replacement Buffer For Factory End Cap or Folding Stock
H&K Heckler & Koch
$24.95H&K MP5K Replacement Buffer for Factory End Cap or Folding Stock This item is a Heckler & Koch Genuine Part, used to replace the factory HK buffer on MP5K folding stocks and end caps. This is only usable on the factory OEM stock and end cap. This...HKP-01233$24.95 -
H&K SP5K, MP5K Reverse Stretch Cocking Tube Support Spring
H&K Heckler & Koch
$6.95H&K SP5K, MP5K Reverse Stretch Cocking Tube Support Spring A great spare to have on hand as this part can become worn and be lost. The cocking tube support spring applies pressure to the cocking tube detent to enable to the detent to lock into...HKP-17873$6.95 -
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 -
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 -
PTR Tactical Handguard Rail Screw
PTR
$0.69PTR Tactical Handguard Rail Screw The 6, 4, 3 & 2 inch rail sections use these screws to attach themselves to the tactical forearm. This is the screw that is used on all the tactical forearm rails (2 inch, 3 inch, 4 inch, 6 inch). A great spare to...HKP-16744$0.69 -
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 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 -
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 -
HKP HK45 .578x28 Thread Protector
HKP HK Parts
$19.95Thread Protector - .578x28 - US - HK45 The new US-made .45 caliber tactical thread protector, the cap fits all HK spec .45 cal full size & compact barrels threaded .578x28 right-hand thread. A must-have item to protect your threaded barrels, exposed...HKP-19514$19.95 -
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 SL8 (5.56/.223) Adjusting Dual and Single Optic Screw
H&K Heckler & Koch
$14.95HK SL8 Dual and Single Adjusting Optic ScrewHKP-16387$14.95 -
HK MP5K, SP5K Rear Push Pin Weldment Set
USA
$14.95HK MP5K, SP5K Rear Push Pin Weldment Set This weldment set is the 2 pieces needed for the rear of the flat/receiver that holds the stock/brace or end cap in place. CNC machined from weldable steel and the finest weldment available on the market...HKP-19632$14.95 -
H&K HK USPC Complete 9mm Recoil Spring w/ Buffer Assembly
H&K Heckler & Koch
$84.95HK USP Compact 9mm Recoil Spring With Buffer Assembly Complete Great spare or replacement item to have as a spare. This is the new factory part for all HK USP9C Pistols.HKP-01158$84.95 -
HKP AR Grip Screw 1/4x28x1 Hex w/ Locking Washer
HKP HK Parts
$1.95HKP AR Grip Screw 1/4x28x1 Hex w/ Locking Washer This replacement screw is to mount your AR-15/AR-10 pistol grip screw. 1/4x28x1 with a star lock washer. The best option to use for new builds or to replace your worn out or stripped screw. The best...HKP-20685$1.95 -
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GSG/Sig Sauer/Kimber Magazine Spring
GSG German Sports Guns
Now: $1.99Was: $3.95GSG/Sig Sauer/Kimber Magazine Spring German-made spare magazine spring for your 10-round 1911 magazine. Compatible With: GSG5 1911 SIG Kimber & many other guns that use this style of magazine for the 1911 .22 conversions.HKP-02795Now: $1.99Was: $3.95 -
H&K HK G36/SL8 Extractor
H&K Heckler & Koch
$79.95G36 & HK SL8 German Extractor For Bolt Head New HK German. This is a great item to keep as a spare. Compatible With: All G36 Variants SL8-1, SL8-6HKP-00287$79.95