Small Parts

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
    New - Evolution Gun Works HK USP Full Size Trijicon RMR-SRO, Holosun 407C-507C Mount - HKP-20042 HK USP Full Size Trijicon RMR-SRO, Holosun 407C-507C Mount
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    HK USP Full Size Trijicon RMR-SRO, Holosun 407C-507C Mount

    Evolution Gun Works

    Now: $44.96
    Was: $49.95
    Evolution Gun Works HK USP Full Size Trijicon RMR-SRO, Holosun 407C-507C Mount Includes: Mounting hardware Features: Material: 7075 aluminum Coating: matte black hardcoat Overall length: 1.780" Overall width: 1.1" Mounting hardware: (2) 6-32...
    Now: $44.96
    Was: $49.95
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  • On Sale
    Used - H&K Trigger Pack Sear/Catch - Surplus - HKP-18304
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    HK90, MP5K Sear Catch - Steel - Used Surplus

    H&K Heckler & Koch

    Now: $11.65
    Was: $12.95
    Heckler & Koch's Sear Catch Release - Complete for HKP 90, MP5K Trigger Packs - German - Used - Steel German HK Sear/Catch complete with installed detent, spring and roll pin. Used surplus in VG-EXC shape and in perfect working order and complete...
    Now: $11.65
    Was: $12.95
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  • On Sale
    New - HK Piston 3-Ring Replacement Set - HKP-00048
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    HK416, MR556, G36, SL8 Piston Ring - Replacement Set of 3

    H&K Heckler & Koch

    Now: $17.95
    Was: $19.95
    HKP Gas Piston Ring Replacement Combo Set- 3 Rings The gas rings are prone to periodic breakage and wear and tear and require them to be replaced periodically. These are some of the most common breakage parts we see that need to be replaced on these...
    Now: $17.95
    Was: $19.95
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  • On Sale
    New - H&K HK VP9/45/P Series Extractor Spring - HKP-01501
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    HK45, VP9 Series Extractor Spring

    H&K Heckler & Koch

    Now: $5.36
    Was: $5.95
    HK VP9/45/P Series Extractor Spring A must-have repair and replacement part and a recommended part to change out when doing routine maintenance on your HK pistol. Compatible With: HK45 HK45C HK P30/P30L HK P30SK HK P2000 HK P2000SK HK VP9 HK VP9A1 F HK...
    Now: $5.36
    Was: $5.95
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  • On Sale
    New - H&K Ambidextrous Sling Pin For Forearm - Small - HKP-00077
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    HK Handguard Sling Pin - Ambi - Small

    H&K Heckler & Koch

    Now: $55.76
    Was: $61.95
    HK German Ambidextrous Small Sling Pin For Forearm This ambidextrous pin will allow the user to attach a sling hook to the sling pin. This will also allow the user to use the sling on either the left or right side.
    Now: $55.76
    Was: $61.95
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    Was: $61.95
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  • Out Of Stock
    On Sale
    New - HKP MP5 & MP5K 9mm Anti-Rattle Roller Tipped Paddle Magazine Release - HKP-17570 HK MP5, MP5K 9mm Anti-Rattle Roller Tipped Paddle Magazine Release

    HK MP5, MP5K 9mm Anti-Rattle Roller Tipped Paddle Magazine Release

    HKP HK Parts

    Now: $23.58
    Was: $29.47
    HK MP5, MP5K 9mm Anti-Rattle Roller Tipped Paddle Magazine Release Latest generation paddle mag release for all 9mm MP5, MP5K style builds. Made to the latest German specs, materials, and design.  Compatible With: MP5, 94 MP5K, SP89, SP5K Other...
    Now: $23.58
    Was: $29.47
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    Now: $23.58
    Was: $29.47
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  • On Sale
    New - H&K HK USP, HK 45, HK 45C Detent Plate Variant 3 & 4 - HKP-01172
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    HK45, HK45C, USP Detent Plate Variant 3 & 4

    H&K Heckler & Koch

    Now: $26.99
    Was: $29.99
    Detent Plate For V3 & V4 Installing the V3/4 detent plate will configure the selector lever to de-cock only, thereby disabling the safety function. The V3/4 is a popular configuration to LE/MIL agencies around the globe as well as many concealed...
    Now: $26.99
    Was: $29.99
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  • On Sale
    New - H&K HK MR556/MR762/416/417/G36/SL8 Complete Gas Piston - HKP-00047
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    HK416, MR556, G36 Gas Piston - Complete

    H&K Heckler & Koch

    Now: $45.86
    Was: $50.95
    H&K HK MR556/MR762/416/417/G36/SL8 Complete Gas Piston New HK German gas piston assembly with three locking piston rings installed. This is a great spare part to have on hand, as the gas piston takes a lot of wear and tear. Compatible With: HK...
    Now: $45.86
    Was: $50.95
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    Was: $50.95
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  • On Sale
    New - HKP HK 21 (7.62x51/.308) Extended Style Cocking Handle - HKP-00363 HK21 Cocking Handle - Extended Style
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    HK21 Cocking Handle - Extended Style

    HKP HK Parts

    Now: $55.96
    Was: $69.95
    HK Extended Cocking Handle - HK21 Rubberized extended cocking handles for the older style HK21 firearms. This extended cocking handle makes a HUGE difference when trying to charge the HK21 firearm, as it has increased spring pressure and can be a pain to...
    Now: $55.96
    Was: $69.95
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    Was: $69.95
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  • On Sale
    New - Magpul M-LOK 5 Slot Rail Section - HKP-19568 M-LOK Rail Section - 5 Slot
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    M-LOK Rail Section - 5 Slot

    Magpul

    Now: $17.05
    Was: $18.95
    Magpul M-LOK 5 Slot Rail Section Designed for use with all M-LOK compatible Hand Guards and Forends, M-LOK Aluminum Rail Sections allow the attachment of various 1913 Picatinny spec rail-mounted accessories such as lights, vertical grips, etc. Machined...
    Now: $17.05
    Was: $18.95
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    Was: $18.95
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  • On Sale
    New - HKP HK Piston Ring Replacement Set - 3 Ring Combo - HKP-17933
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    HK416, MR556, G36, SL8 Piston Ring - Replacement Set of 3 - USA

    HKP HK Parts

    Now: $7.16
    Was: $8.95
    HK MR556, HK416 & G36, SL8 Gas Piston Ring Replacement Combo Set - 3 Rings This is a high wear common repair & replacement item. The gas rings are prone to periodic breakage & wear, tear and require them to be replaced periodically...
    Now: $7.16
    Was: $8.95
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    Now: $7.16
    Was: $8.95
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  • On Sale
    New - H&K HK VP9/VP9SK, HK VP40 Clamping Sleeve For Drop Safety Axle - HKP-16838
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    HK VP9, VP9SK, VP40 Clamping Sleeve For Drop Safety Axle

    H&K Heckler & Koch

    Now: $6.25
    Was: $6.95
    Clamping Sleeve For Drop Safety Axle VP9, VP9SK & VP40 This is the roll pin that goes in the side of the slide and retains the drop safety.
    Now: $6.25
    Was: $6.95
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    Now: $6.25
    Was: $6.95
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