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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HKP HK MP5 (.40 S&W) Locking Roller -6
HKP HK Parts
$11.95HK US MP540 Undersized Locking Roller, -6 The proper roller size is essential for headspacing the bolt gap correctly. Please Note: The price listed is per roller. Order 2 (pair) for a complete set for the bolt head. An easy way to remember the size you...HKP-17566$11.95 -
H&K HK P Series Complete Spurred Hammer
H&K Heckler & Koch
$59.95H&K HK P Series Complete Spurred Hammer New German HK spurred hammer complete. Compatible With: All non LEM pistol below: P30, P30L, P30SK P2000 P2000 SKHKP-16540$59.95 -
H&K HK USP Lanyard Loop Insert Pin
H&K Heckler & Koch
$19.95HK USP Lanyard Loop Insert Pin Compatible With: HK USP 9mm HK USP 40 HK USP 45HKP-01930$19.95 -
H&K UMP/USC (.40 S&W/.45 ACP/9mm) Bolt Catch Spring
H&K Heckler & Koch
$8.95HK UMP & USC Bolt Catch Spring Compatible With: HK UMP HK USCHKP-01900$8.95 -
HKP HK MP5 40 Locking Roller +4
HKP HK Parts
$11.95HK US MP540 Undersized Locking Roller, +4 The proper roller size is essential for proper headspacing of bolt gap. Please Note: The price listed is per roller. Order 2 (pair) for a complete set for the bolt head. An easy way to remember the size you need...HKP-17562$11.95 -
H&K HK 30/P30L/45/45C Hammer Bearing
H&K Heckler & Koch
$19.95HK 30, P30L, 45, & 45C Hammer Bearing Compatible With: HK P30 HK P30L HK45 HK45 Compact Please Note: This item does not have the lockout device built in for those that prefer NOT to have the lockout feature.HKP-01800$19.95 -
H&K HK MR556/416 Ejector For Bolt Head
H&K Heckler & Koch
$23.95H&K HK MR556/416 Ejector For Bolt Head HK German factory part. Compatible With: MR556 HK 416HKP-00037$23.95 -
H&K HK P30/P2000 Release Latch & Decocker
H&K Heckler & Koch
$32.95HK P30 & P2000 Release Latch & Decocker Compatible With: HK P30 HK P30L HK P2000 HK P2000SKHKP-01773$32.95 -
H&K HK P30/P30S 9mm Complete Recoil Assembly
H&K Heckler & Koch
$89.95HK P30 & P30S 9mm Recoil Rod Assembly - Complete A genuine German Heckler & Koch part. Fresh springs help the pistol function as it was designed. Compatible With: P30 P30SHKP-01497$89.95 -
H&K HK USPC/45C Firing Pin
H&K Heckler & Koch
$34.95H&K HK USPC/45C Firing Pin A great spare part to have on hand for wear and breakage parts. A factory German HK OEM part. Compatible With: HK45 Compact HK45C Tactical HK USP Compact 45 HK USPC Tactical 45HKP-01288$34.95 -
HK UMP, USC Right Hammer Spring
USA
$9.95HK UMP & USC Right Side Hammer Spring For Lowers - USAHKP-19557$9.95 -
HKP HK MP5 (.40 S&W) Locking Roller -2
HKP HK Parts
$11.95HK US MP540 Undersized Locking Roller, -2 The proper roller size is essential for proper headspacing of bolt gap. Please Note: The price listed is per roller. Order 2 (pair) for a complete set for the bolt head. An easy way to remember the size you need...HKP-17563$11.95 -
Detent Plate For HK45, HK45C Variant 1, 2
H&K Heckler & Koch
$14.50Detent Plate For HK45, HK45C Variant 1, 2 Compatible With: HK45 HK45 CompactHKP-01807$14.50 -
H&K A3 Retractable Stock Clamping Lever Spring
H&K Heckler & Koch
$19.95HK German Retractable Stock Clamping Lever Spring For A3 Retractable Stocks This spring is the most common breakage/wear item in the internal workings of the A3 retractable stock.HKP-01089$19.95 -
$13.95 -
HK G36/SL8 Extractor
USA
$67.95G36 & HK SL8 Extractor For Bolt Head This is a great item to keep as a spare. Compatible With: All G36 variants SL8-1, SL8-6HKP-18882$67.95 -
HKP HK 45/45 Tactical Titanium Firing Pin
HKP HK Parts
$49.95Firing Pin HK45 & HK45 Tactical - Titanium - Grade 6 A solid billet CNC offering at 40+% lighter than comparable steel firing pins. Our titanium firing pins travel faster in the slide, delivering a quicker lock time & enhancing accuracy. Titanium...HKP-17811$49.95 -
HKP HK MP5 (.40 S&W) Locking Roller +2
HKP HK Parts
$11.95HK US MP5 .40 S&W Locking Roller, +2 The proper roller size is essential for proper headspacing of bolt gap. +2 / 8.02mm Please Note: The price listed is per roller. Order 2 (pair) for a complete set for the bolt head. An easy way to remember the...HKP-17564$11.95 -
Single Optic Front Sight Screw - G36 - Extended
USA
$5.95Single Optic Front Sight Screw - G36 - ExtendedHKP-20894$5.95 -
H&K HK G36 Left Side Lower Hammer Spring
H&K Heckler & Koch
$8.95HK G36 Left Side Lower Hammer SpringHKP-01856$8.95 -
H&K HK P30 Recoil Rod Compression Spring
H&K Heckler & Koch
$7.95H&K HK P30 Recoil Rod Compression SpringHKP-16653$7.95 -
H&K HK USPC/P30/45C Recoil Spring Washer Retainer
H&K Heckler & Koch
$9.95New HK German Recoil Spring Washer Retainer This is the retaining washer that holds the spring captive on the end of the recoil assembly and pushes against the recoil spring. Compatible With: All USP Compact models P2000 P30 HK45 HK45CHKP-01594$9.95 -
Out Of Stock
H&K USC/SL8 (.45 ACP/5.56/.223) Buttstock Screw - Used
H&K Heckler & Koch
$9.95Buttstock Allen Screw For HK USC Or HK SL8 rifles. This is the screw that holds the stock assembly onto the upper receiver of the HK USC & SL8.Great for replacements or to have as spares. This item is factory HK and a common spare.HKP-01649$9.95 -
On Sale
TPM AR-15 Enhanced Firing Pin
Tactical Precision MFG
Now: $19.95Was: $24.99TPM AR-15 Enhanced Firing Pin These AR-15 firing pins are precision machined using CNC Swiss turning centers. The titanium AR-15 firing pin is made from Grade 6 titanium which has an ultimate tensile strength of 140,000 psi. titanium is 40% lighter than...HKP-20911Now: $19.95Was: $24.99 -
H&K HK 416 Roll Pin For 33mm Front Folding Sight
H&K Heckler & Koch
$4.95HK 416 Roll Pin For 33mm Front Folding Sight This version is the enhanced (longer) roll pin for a more secure fitment.HKP-14144$4.95 -
H&K HK MR556/416 Extractor Spring Buffer
H&K Heckler & Koch
$11.95HK 416, MR556 Extractor Spring Buffer This buffer fits inside the extractor spring in the extractor pocked of the bolt. This item is a high wear item and a spare would be highly advised. Compatible With: HK MR556 & HK416 Firearms.HKP-00051$11.95 -
H&K HK P Series Catch
H&K Heckler & Koch
$23.95HK P Series Catch Compatible With: HK P30 HK P30L HK P30SK HK P2000 HK P2000SKHKP-01796$23.95 -
H&K HK P9S 9mm Extractor
H&K Heckler & Koch
$79.95HK P9S 9mm Extractor This extractor is no longer manufactured and is hard to find. This is the last remaining stock that HK had in inventory. Last call for this part.HKP-01997$79.95 -
H&K HK Pistol Trigger Axle
H&K Heckler & Koch
$6.95HK Pistol Trigger Axle Compatible With: HK USP 9mm .40 S&W .45 ACP HK USP Compact 9mm .40 S&W .357 SIG .45 ACP HK P30 HK P30L HK P30SK HK P2000 HK P2000SK HK45 HK45 CompactHKP-01806$6.95 -
H&K HK USP Pistols Trigger Bar
H&K Heckler & Koch
$39.95HK USP Pistols Trigger Bar Compatible With: USP 9mm USP .40 USP .45 ALL full size tactical pistols. USP Elite, Expert, etc. Please Pote: Not for use on the USPC models.HKP-01933$39.95 -
H&K UMP/USC/G36/SL8 (.40 S&W/.45 ACP/9mm/5.56/.223) Index Plate Compression Spring
H&K Heckler & Koch
$7.95H&K UMP/USC/G36/SL8 (.40 S&W/.45 ACP/9mm/5.56/.223) Index Plate Compression SpringHKP-16496$7.95 -
HKP HK 21E/11E (7.62x51/.308) Firing Pin - Titanium
HKP HK Parts
$49.95HK21E, MM21E, 11E Firing Pin - Titanium Grade 6 weapons grade Titanium manufacture. Made in the USA. A must have upgrade to have on hand as the firing pin is one of the most abused components in the HK weapon system. Get the lightest,...HKP-17771$49.95 -
H&K HK Mark 23 Recoil Assembly Compression Spring
H&K Heckler & Koch
$19.95Mark 23 Recoil Assembly Compression Spring Brand new HK German recoil spring for the HK Mark 23 or SOCOM .45 Pistol. A high wear item that needs to be changed & replaced often as this is a consumable part.HKP-16644$19.95 -
$9.99 -
H&K HK MR556/416 Charging Handle Release Latch
H&K Heckler & Koch
$39.95HK Ambidextrous HK416, MR556 Charging Handle Release Latch Perfect replacement item for the MR556 & HK 416 charging handle. New HK German manufacture. These can become chewed up and damaged with a hard drop or with heavy use. This is a great item to...HKP-16553$39.95 -
$64.95 -
HKP HK MR762/417 Titanium Firing Pin
HKP HK Parts
$49.95HK MR762 & HK417 Firing Pin - Titanium Grade 6 weapons grade Titanium manufacture. Made in the USA. A must have upgrade to have on hand as the firing pin is one of the most abused components in the HK MR 762 & HK417 weapon system. Get the...HKP-17768$49.95 -
MM HK 21 (7.62x51/.308) Factory Style T- Rail Set
Michaels Machines
$275.00Michael's Machines HK 21 (7.62x51/.308) Factory Style T-Rail Set HK21 US-made rails for all HK21 builds. This is similar to the rails above, only prepped/cut for the HK21 feed mechanism.HKP-00823$275.00 -
H&K G36/SL8 (5.56/.223) Cocking Handle Spring
H&K Heckler & Koch
$10.95HK German G36 Cocking Handle Spring - All Variants Compatible With: G36 - all variants SL8 - all variantsHKP-01862$10.95 -
H&K G36/SL8 (5.56/.223) Ejector Spring
H&K Heckler & Koch
$35.95HK G36 & SL8 Series Ejector Spring - HK German This is a great item to have on hand as this part is prone to wear and breakage.HKP-01867$35.95