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  1. HK416 and HK417 HQ
    Hi I tried to install on HK MR762 a Dead Air Silencers a Keymount Muzzle Break to make a Sandman S ready. but it ended up that HK has a space between end of barrel and threads. so when I place a new muzzle break there is a space around 7.30mm or 0.287in and adjustment rings are floating there...
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