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I hope you didn't add the MBUS to that railed front gas block. Those polymer sights aren't meant for gas blocks and can melt or become damaged once the block gets hot.
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This is OK on moose fat's rifle. The .22LR CMMG upper works on blowback, and the gas block (which is non-fuctional - there's no gas tube installed on these uppers) doesn't heat up all that much.