1/2x28 closed-tine 5.56 flash hider that doubles as the host-side ASR mounting surface.
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SilencerCo Flash Hider 1/2-28, Black - Effective Flash Reduction and Concealment - AC5326
Add the SilencerCo ASR Closed-Tine Flash Hider .223 (1/2x28) to your build and see how it enhances your platform.