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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  • Out Of Stock
    On Sale
    New - H&K HK 416 Commercial OTB Buffer Tube HK E1 Stock Combo - Black - hkp-18361 HK416 E1 Buttstock and Buffer Tube Combo - Commercial OTB

    HK416 E1 Buttstock and Buffer Tube Combo - Commercial OTB

    H&K Heckler & Koch

    Now: $392.95
    Was: $469.95
    Heckler and Koch's E1 Buttstock and OTB Buffer Tube Combo - Commercial for HK416 Genuine HK416 E1 commercial buttstock with the new style marine environment "over the beach" buffer tube. Buffer tube has ball bearing rollers to tighten the buttstock...
    HKP-18361
    Now: $392.95
    Was: $469.95
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    Now: $392.95
    Was: $469.95
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  • New - H&K HK G36 Right Side Lower Hammer Spring - HKP-01857
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    HK G36 Hammer Spring - Right Side

    H&K Heckler & Koch

    $8.95
    HK G36 Right Side Lower Hammer Spring  
    HKP-01857
    $8.95
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    $8.95
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  • Out Of Stock
    New - H&K G36/SL8 (5.56/.223) Forearm Original Version - HKP-01936

    HK G36, SL8 Handguard - Gen 1

    H&K Heckler & Koch

    $106.95
    German HK G36 & HK SL8 Black Forearm- 1st Gen  This part is the older style 1st gen that has the bipod grove to allow the factory HK bipod to be installed. New HK black in color without a heat shield. No longer in production...
    HKP-01936
    $106.95
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    $106.95
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  • On Sale
    New - HKP HK G36/SL8 (5.56/.223) Cocking Handle - HKP-18251 HK G36, SL8 Cocking Handle
    Add to Cart

    HK G36, SL8 Cocking Handle

    HKP HK Parts

    Now: $39.95
    Was: $49.95
    Cocking Handle For G36 & SL8 Bolt Carriers - USA New USA made charging handle ideal for a 922 replacement part. Made in the USA.
    HKP-18251
    Now: $39.95
    Was: $49.95
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  • Out Of Stock
    New - HDPS HK UMP/USC (.40 S&W/.45 ACP/9mm) Stock Block B - Push Pin - HKP-16339 HK UMP, USC Stock Block B Sling Pin - Push Pin Style

    HK UMP, USC Stock Block B Sling Pin - Push Pin Style

    HDPS

    $39.95
    HDPS HK UMP/USC (.40 S&W/.45 ACP/9mm) Stock Block B - Push Pin This sling pin will replace the current production stock Block B hardware and upgrade to the Sling Pin Pull Style version.
    HKP-16339
    $39.95
    Out Of Stock
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    $39.95
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  • On Sale
    New - MM HK UMP/USC (9mm) Semi Auto Bolt Carrier - HKP-02283 HK USC, USC Bolt Carrier - Semi Auto - 9mm
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    HK USC, USC Bolt Carrier - Semi Auto - 9mm

    Michaels Machines

    Now: $559.95
    Was: $699.95
    HK UMP/USC (9mm) Semi Auto Bolt Carrier The semi-auto bolt group is needed for HK USC to HK UMP caliber conversions. The full-auto bolt carrier will not work in HK USC rifles.  Specifications: Tungsten Filled Heat Treated Parkerized &...
    HKP-02283
    Now: $559.95
    Was: $699.95
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    Was: $699.95
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  • New - HK UMP Lower Bolt Carrier Guide - HKP-16500 HK UMP Bolt Carrier Guide
    Add to Cart

    HK UMP Bolt Carrier Guide

    H&K Heckler & Koch

    $12.95
    Heckler and Koch German All Steel UMP Carrier Guide This is the steel piece the guides the UMP bolt carrier. Compatible With: All HK UMP lowers
    HKP-16500
    $12.95
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  • Out Of Stock
    New - MM HK UMP (9mm) Full Auto Bolt - HKP-02288 HK UMP Bolt Carrier - Full Auto - Stripped 9mm

    HK UMP Bolt Carrier - Full Auto - Stripped 9mm

    Michaels Machines

    $699.95
    HK UMP 9mm - Full Auto Bolt - Stripped The full auto bolt carrier is for HK UMP rifles. The full-auto bolt carrier will not work in the HK USC conversion rifles. One of the finest aftermarket carriers you can buy. Features: Tungsten filled Heat...
    HKP-02288
    $699.95
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  • On Sale
    New - Raddlock Key - HK Series - HKP-02447
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    Raddlock Key - HK Series

    Raddlock

    Now: $4.95
    Was: $9.95
    HK Series Raddlock Key And Lanyard Raddlock kits convert your firearm to a non-detachable magazine configuration for states with removable magazine restrictions. This is a replacement key for firearms equipped with a Raddlock device. Compatible With the...
    HKP-02447
    Now: $4.95
    Was: $9.95
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  • Out Of Stock
    New - MM HK 21 (7.62x51/.308) Factory Style T- Rail Set - HKP-00823 HK21 T-Rail Set - Factory Style

    HK21 T-Rail Set - Factory Style

    Michaels Machines

    $275.00
    Michael'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
    Out Of Stock
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    $275.00
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  • On Sale
    New - HKP MP5 40/10 Ambidextrous (0,1) Trigger Pack - HKP-17231 HK MP5 Trigger Pack - Ambi 0,1 - .40 S&W, 10mm
    Add to Cart

    HK MP5 Trigger Pack - Ambi 0,1 - .40 S&W, 10mm

    HKP HK Parts

    Now: $259.95
    Was: $324.95
    HKP MP5 40/10 Ambidextrous (0,1) Trigger Pack Finally a lower cost alternative to the spendy and hard to find all German HK FBI or 0,1 ambi trigger packs. Now for the first time, we have the ever popular trigger pack available in an all German & US...
    HKP-17231
    Now: $259.95
    Was: $324.95
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    Now: $259.95
    Was: $324.95
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  • New - HKP MP5 40/10 Low Impulse Locking Piece #24 - HKP-18272 HK MP5 Locking Piece #24 - 90 Degree - Low Impulse - .40 S&W, 10mm
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    HK MP5 Locking Piece #24 - 90 Degree - Low Impulse - .40 S&W, 10mm

    HKP HK Parts

    $44.95
    MP5 40 & MP5 10mm US Made - Low Impulse Locking Piece Marked (Low #24) For the MP5 40 or 10mm Firearms. Made out of enhanced material and heat treated to spec. The # 24 is the 90 degree locking piece. This is also the standard non hi impulse ammo...
    HKP-18272
    $44.95
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    Qty in Cart: 0
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    $44.95
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