Parts

Parts

At HK Parts, we offer a wide range of high-quality Heckler and Koch accessories and components for your favorite firearms. Whether you are upgrading a Heckler and Koch pistol or rifle, or building with parts kits, we have you covered. Explore top-rated components for VP9, USP, P30, MP5, MP5K, G36, HK416, and more. From triggers, barrels, and grips to magazines, stocks, and sights, find the parts you need to enhance performance, reliability, and function.

Popular upgrades include match triggers, threaded barrels, compensators, optic plates, and extended magazines. Rifle owners often add enhanced stocks, forearms, and ambidextrous controls.
MP5 and MP5K kits are top sellers, giving shooters authentic components for iconic builds. G36 and HK416 kits are also highly sought after by collectors and professionals alike.
HKP offers the world’s largest H&K-focused catalog, with better availability, faster fulfillment, and expert support compared to general retailers.

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  • New - H&K HK G36K Incomplete Piston Rod - Black - HKP-16345
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    HK G36K Piston Rod - Incomplete

    H&K Heckler & Koch

    $69.95
    H&K HK G36K Incomplete Piston Rod
    HKP-16345
    $69.95
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  • Out Of Stock
    New - H&K HK G36K Slimline Handguard - Black - HKP-18483 HK G36K Handguard - Slimline Style

    HK G36K Handguard - Slimline Style

    H&K Heckler & Koch

    $0.00
    G36K Slim line handguard with Hkey mounting slots HK German G36K forearm with HKey mounting slots. Made in Germany.
    HKP-18483
    $0.00
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    New - H&K G36K Factory (5.56/.223) 4 Prong Flash Hider - Threaded 15x1 RH - HKP-00282 HK G36K, SL8 Flash Hider - 4 Prong - Threaded 15x1 RH

    HK G36K, SL8 Flash Hider - 4 Prong - Threaded 15x1 RH

    H&K Heckler & Koch

    $0.00
    HK Heckler and Koch's Factory 4 Prong Flash Hider - 15x1 RH   HK flash hider will fit any HK 5.56/.223 rifle barrel threaded 15x1 RH.   Specifications: Overall Length 2 7/8" Threaded 15x1 RH Compatible With: HK G36K HK SL8 5.56/.223...
    HKP-00282
    $0.00
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    New - H&K HK G36 Complete Bolt Group - Black - HKP-00635 HK G36 Bolt Group - Complete

    HK G36 Bolt Group - Complete

    H&K Heckler & Koch

    $0.00
    HK G36 Bolt Group New Factory German HK. HK G36 HK G36K HK G36CThis will not work with a HK SL8.
    HKP-00635
    $0.00
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  • New - H&K HK 45 Recoil Spring Guide Rod - Black - HKP-18592
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    HK45 Recoil Spring Guide Rod

    H&K Heckler & Koch

    $59.95
    H&K HK 45 Recoil Spring Guide Rod - Black Compatible With: HK 45 HK 45 Tactical
    HKP-18592
    $59.95
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  • Out Of Stock
    New - RCM HK VP40 .40 S&W Tactical Barrel - Threaded 9/16x24 - HKP-17370 HK VP40 Tactical Barrel - .40 S&W - 4.45" - Threaded 9/16x24

    HK VP40 Tactical Barrel - .40 S&W - 4.45" - Threaded 9/16x24

    RCM

    $212.50
    RCM HK VP40 .40 S&W Tactical Barrel - Threaded 9/16x24 Each barrel is meticulously crafted from ordnance-grade steel, heat-treated, and finished with a durable nitride coating. This is the finest threaded barrel for the HK VP40 .40 S&W pistol,...
    HKP-17370
    $212.50
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  • Used - H&K HK USC 45 Barrel - Used - HKP-20471 HK USC 45 Barrel - .45 ACP - Used
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    HK USC 45 Barrel - .45 ACP - Used

    H&K Heckler & Koch

    $695.95
    Barrel - HK USC 45 in Exc + shape HK German factory USC 45 barrel in excellent + condition. Rare and hard to find. 
    HKP-20471
    $695.95
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  • Out Of Stock
    New - H&K MP5/SP5, 93/33, G3/91 (9mm, 5.56/.223, 7.62/.308) Unmarked Ambidextrous Housing - Universal - HKP-19854 HK MP5, SP5, HK33, HK93, HK91, G3 Housing - Ambi - Unmarked - 9mm, 5.56 / .223, 7.62 / .308

    HK MP5, SP5, HK33, HK93, HK91, G3 Housing - Ambi - Unmarked - 9mm, 5.56 / .223, 7.62 / .308

    H&K Heckler & Koch

    $0.00
    H&K MP5/SP5, 93/33, G3/91 (9mm, 5.56/.223, 7.62/.308) Unmarked Ambidextrous Housing - Universal This unmarked universal ambidextrous lower housing is designed for use with ambidextrous trigger packs, offering versatility across multiple H&K...
    HKP-19854
    $0.00
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  • Out Of Stock
    Used - H&K HK G36 Magazine Catch Release Lever - HKP-19771 HK G36, SL8 Bolt Locking Lever - Complete - USED

    HK G36, SL8 Bolt Locking Lever - Complete - USED

    H&K Heckler & Koch

    $9.95
    H&K HK G36, SL8 Complete Locking Lever: USED   The locking lever is installed within the trigger housing, ensuring reliable and secure bolt lockup. Used in good condition.    Compatible With: H&K SL8, G36 H&K USC, UMP
    HKP-19771
    $9.95
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    Used - H&K HK G3, 91 F/A Complete Bolt Group - HKP-19671 HK91. G3 F/A Complete Bolt Group

    HK91. G3 F/A Complete Bolt Group

    H&K Heckler & Koch

    $0.00
    German  G3, 91 F/A Bolt Group CompleteEach Bolt group includes the following factory HK parts: Complete Bolt Head Assembled (extractor, extractor spring, roller retainer plate and rollers) >Firing pin >Firing pin spring >HK91/G3 locking piece...
    HKP-19671
    $0.00
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    New - HK German Carry Handle - HK91, G3, HK93, & HK33 - New Old Stock - HKP-19551 HK German Carry Handle - HK91, G3, HK93, & HK33 - New Old Stock

    HK German Carry Handle - HK91, G3, HK93, & HK33 - New Old Stock

    H&K Heckler & Koch

    $0.00
    HK German Carry Handle for HK91, G3, HK93, & HK33 Weapon Systems - New Old Stock HK German new old stock condition. The carry handle installs by sliding the carry handle over the cocking tube to make contact with the trunnion. This can be installed...
    HKP-19551
    $0.00
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  • Out Of Stock
    New - HK UMP Paddle Mag Release Complete Assembly - HKP-19499 HK UMP Paddle Mag Release Complete Assembly

    HK UMP Paddle Mag Release Complete Assembly

    $19.95
    UMP Paddle Magazine Release - US Made - Assembly Complete New UMP Mag release. This is a very common repair & replacement part as they are fairly easy to break on the UMP lower. Simple & easy to install no gunsmith needed or required. Compatible...
    HKP-19499
    $19.95
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    $19.95
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