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 CC9 Large Backstrap - HKP-22109
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    HK CC9 Backstrap - Large

    H&K Heckler & Koch

    $14.95
    H&K CC9 Large Backstrap   Made in Germany by H&K, this CC9 large backstrap provides a larger grip profile for a custom fit.   Compatible With: HK CC9    
    HKP-22109
    $14.95
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    $14.95
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  • New - HKP 15 Round HK45 E2 Magazine - HKP-21803-M HK45 E2 Magazine with Extension - 15 Round
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    HK45 E2 Magazine with Extension - 15 Round

    HKP HK Parts

    $113.95
    HKP HK Parts 15 Round E2 Magazine for HK45   HK45 and HK45 Tactical +5 magazine extension. Paired with a new HK German 10 round HK45 magazine for a total capacity of 15 rounds. Ideal for competition shooters that would like a higher magazine...
    HKP-21803-M
    $113.95
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    $113.95
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  • Used - H&K MP5 , HK94 Factory A3 Stock - Used - HKP-21644 HK MP5, HK94 A3 Retractable Buttstock - Factory - Like New
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    HK MP5, HK94 A3 Retractable Buttstock - Factory - Like New

    H&K Heckler & Koch

    $799.95
    H&K Heckler and Koch Factory A3 Like New Buttstock for HK MP5 and HK94 The original Navy-style German HK MP5 A3 stock is a rare find, as it's no longer in production and has been replaced by the MP5 F-style stock. We are offering the sought-after...
    HKP-21644
    $799.95
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    $799.95
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  • New - HKP P30 9mm Fluted Barrel - Threaded 13.5x1 - HKP-21443 HK P30 Fluted Barrel - 9mm - 4.5" - Threaded 13.5x1
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    HK P30 Fluted Barrel - 9mm - 4.5" - Threaded 13.5x1

    HKP HK Parts

    $229.95
    HKP P30 9mm Fluted Barrel - Threaded 13.5x1 Made from ordnance grade steel, heat treated, and finished with durable nitride. Each fluted barrel includes an O-ringed thread protector that will not loosen or fall off during range sessions...
    HKP-21443
    $229.95
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  • New - Omega HK UMP Cocking Handle Assembly - HKP-21271
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    HK UMP Cocking Handle - Assembly

    OMEGA

    $34.95
    Omega USC/UMP Cocking Handle Assembly   Omega UMP cocking handle assembly is a great complete replacement for broken or worn out cocking handle assemblies. Everything you need for a complete replacement. US made by Omega. UMP cocking handle assembly...
    HKP-21271
    $34.95
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    $34.95
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  • On Sale
    New - HKP HK45C Railok™ Threaded Barrel Compensator - HKP-21264 HK45C Railok™ Threaded Barrel Compensator
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    HK45C Railok™ Threaded Barrel Compensator

    HKP HK Parts

    Now: $129.95
    Was: $189.95
    HK Parts Railok™ Mounting System Threaded Barrel Compensator: H&K HK45C The HK Parts Railok™ mounting system compensator strikes a seamless balance of form and function.  Users will immediately notice the reduction in muzzle...
    HKP-21264
    Now: $129.95
    Was: $189.95
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    Was: $189.95
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  • On Sale
    New - HKP V51 Backplate - HKP-21201 HK V51 Backplate
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    HK V51 Backplate

    HKP HK Parts

    Now: $99.95
    Was: $167.95
    HKP V51 Backplate HK Parts brings you a long lost part that was no longer available till now. The Vector Arms V51 firearms was one of the most aclaimed PDW of its time but replacement parts have become difficult to source. We now take like new G3...
    HKP-21201
    Now: $99.95
    Was: $167.95
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    Now: $99.95
    Was: $167.95
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  • New - HKP HK UMP Enhanced Top Rail - Red - HKP-20812 HK UMP Enhanced Top Rail - Red
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    HK UMP Enhanced Top Rail - Red

    HKP HK Parts

    $49.95
    HKP HK UMP Enhanced Top Rail - Red HK USC, UMP top receiver rail with hardware. The extended length allows the use of all optics that fit on a Picatinny rail. This unit has a contoured no snag design for ease of use and a beautiful fit. Includes: Each...
    HKP-20812
    $49.95
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    $49.95
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  • New - HK UMP, USC Right Hammer Spring - HKP-19557
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    HK UMP, USC Hammer Spring - Right - US

    USA

    $9.95
    HK UMP & USC Right Side Hammer Spring For Lowers - USA
    HKP-19557
    $9.95
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    $9.95
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  • New - HK G36, HK SL8 Bolt Catch USF - HKP-19122 HK G36, HK SL8 Bolt Catch USF
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    HK G36, HK SL8 Bolt Catch USF

    USA

    $14.95
    HK G36 & SL8 Bolt Catch On AR-15 systems this would be similar to a cam pin. Compatible With: G36, G36K, G36C Sl8 variants
    HKP-19122
    $14.95
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    $14.95
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  • New - RCM HK 99/33/33K Full Auto Bolt Carrier US - Black - HKP-20537 HK33, HK33K, HK93 Bolt Carrier - Full Auto - US
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    HK33, HK33K, HK93 Bolt Carrier - Full Auto - US

    RCM

    $359.95
    HK 93, 33 & 33K Full Auto Bolt Carrier - US - RCM Brand new US RCM manufactured new style HK33/93, 33K factory bolt carrier. The finest HK bolt carrier ever made with the latest & greatest German inspired improvements and updates.  Ideal for...
    HKP-20537
    $359.95
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    $359.95
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  • New - HKP Dual HK MP5 Magazine Clamp Conversion Screw - HKP-20318 HK MP5 Dual Magazine Clamp Conversion Screw - G3 to MP5 Mags
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    HK MP5 Dual Magazine Clamp Conversion Screw - G3 to MP5 Mags

    HKP HK Parts

    $2.95
    HKP Dual HK MP5 Magazine Clamp Conversion Screw This screw converts a HK91, G3, PTR dual magazine clamp (HKP-19634) into the correct length for use with an MP5 magazine. Includes:  1 screw
    HKP-20318
    $2.95
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    $2.95
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