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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On Sale
RCM Rollers, + & - Sizes
RCM
Now: $8.05Was: $8.95RCM Rollers, + & - Sizes RCM US-made locking rollers are available in both plus and minus sizes, making them the ideal choice for adjusting bolt gaps. These rollers are the top-tier locking rollers on the market, delivering unbeatable performance and...Now: $8.05Was: $8.95 -
On Sale
HK UMP, USC Picatinny Rail Set - 4 Piece
HKP HK Parts
Now: $119.96Was: $149.95HK UMP, USC Rail Set Complete A complete set of rails for your HK UMP/USC featuring an extended top rail for mounting your optic of choice. The rails are scratch resistant, class 3 mil-spec hard coat anodized. Each set includes the top rail, all 3 side...Now: $119.96Was: $149.95 -
On Sale
Retractable Stock Buffer - MP5 A3 - USA
Now: $6.97Was: $7.74MP5 A3 Retractable Stock "H" Buffer For All HK A3 Retractable Stocks The A3 stock buffer is a high-wear and replacement item that needs replacement when torn, cracked, brittle, discolored, and worn. These units are from the same material and durometer as...Now: $6.97Was: $7.74 -
On Sale
HK USP, HK45 Short Reset System
Grayguns
Now: $81.00Was: $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...Now: $81.00Was: $90.00 -
On Sale
HK 90 Series Pistol Grip Parts Storage Holder
HKP HK Parts
Now: $23.96Was: $29.95HK Pistol Grip Parts Storage Holder - SEF & Ambidextrous Housings A must-have item for storage, it doesn't have a battery compartment to maximize storage. This HK grip plug will fit all SEF or Ambidextrous housings that have the holding tabs in the...Now: $23.96Was: $29.95 -
On Sale
HK MP5, MP5K Extractor - 9mm - Enhanced
HKP HK Parts
Now: $27.96Was: $34.95HK MP5, MP5K 9mm Extractor - Latest Generation Style HK Parts offers the finest US made 9mm "F" type extractor for all HK MP5/94 bolt heads. CNC'd from a solid billet of ordnance grade steel for superior function & durability. Each 9mm extractor has...Now: $27.96Was: $34.95 -
Out Of StockOn Sale
HK Sling Pin - Small - Quick Detach Attachment
HKP HK Parts
Now: $30.36Was: $37.95HKP Quick Detach Sling Attachment Sling Pin - Small The small push pin is used to retain the forearm to the receiver on the 90 series of firearms. The QD sling pin is a great replacement item as it will allow the user to simply swap the push pin for the...Now: $30.36Was: $37.95 -
On Sale
HK416, MR556 Gas Block Roll Pin
H&K Heckler & Koch
Now: $5.36Was: $5.95HK 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.Now: $5.36Was: $5.95 -
On Sale
HK MP5SD Sealing Ring - Enhanced
HKP HK Parts
Now: $7.96Was: $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...Now: $7.96Was: $9.95 -
On Sale
HK VP9, VP9SK, VP40 Enhanced Support Sleeve
HKP HK Parts
Now: $15.96Was: $19.95HKP HK VP9/VP40 Enhanced Support Sleeve The support sleeve in the VP series pistols is a crucial component that allows for the removal of the slide plate, firing pin assembly, and other parts. The factory version is made from polymer, which can wear down...Now: $15.96Was: $19.95 -
On Sale
HK Oversized Barrel Retaining Pin - 5.25mm
H&K Heckler & Koch
Now: $8.96Was: $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...Now: $8.96Was: $9.95 -
On Sale
HK USP, P2000SK, HK45CT Match Trigger Return Spring
H&K Heckler & Koch
Now: $8.05Was: $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...Now: $8.05Was: $8.95