HK416 / MR556 Receivers / Uppers

HK416 / MR556 Receivers / Uppers

Upgrade the core of your HK MR556 or HK416. Choose from genuine HK receivers, complete upper receiver groups, and stripped uppers for custom builds. 

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  • New - H&K HK MR556 A4 Complete Upper w F/A & Ejection Door - HKP-21929 HK MR556 A4 Upper, Complete - Full Auto and Ejection Door
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    HK MR556 A4 Upper, Complete - Full Auto and Ejection Door

    H&K Heckler & Koch

    $845.95
    HK Heckler and Koch A4 Complete Upper with Full Auto Ejection Door for HK MR556 The HK MR556 A4 Complete Upper is a superior factory assembly that comes fully equipped with a forward assist and an...
    HKP-21929
    $845.95
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