Thread: M&P 300 Barrel thread size?
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Old 09-20-2020, 12:51 AM
Fayeilding Fayeilding is offline
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Default M&P 300 Barrel thread size?
So 5.56 is always 1/2x28. 300 blackouts are usually 5/8x24, but can sometimes be 1/2x28.

I am changing stock flash hider and wanted to see if anyone knows the thread on the M&P 15 300 blackout/whisper?

Thank you
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