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Old 08-27-2021, 11:17 AM
kabong57
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CMMG 16.1 M$ barrel ?



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I have a CMMG 16" M4 barrel inbound for a build . Would any one know the outside diameter of the barrel at the muzzle end ? Would like to find a 1/2-28 thread protector that doesn't look to hideous.
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Old 08-27-2021, 11:26 AM
octanejunkie

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I have one at home I can mic tonight but just under .735 give or take a few thou for finish thickness variation

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Old 08-27-2021, 11:35 AM
carbineone

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A quick call to CMMG would get a firm answer..But I have a CMMG barrel here and it measures .720..Should be good enough give or take..

Show us some pics of what you put together..
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Old 08-27-2021, 12:37 PM
zukiphile is online now
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.720-.735 sounds right.

I attach clamp-on gas blocks down by the muzzle for iron sight mounting, and it's only barely smaller at the end.

FWIW, CMMG threads are short like a 10/22, not long like a real AR.
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Old 09-06-2021, 07:50 PM
kabong57
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Two attempts w pics

Ordered 2 diff. thread protectors. GROVTEC GTHM245 , really liked the style and fitment (.740 OD ) but almost twice as long as needed @ .633 . AMAZON STG MFG X002JB453R, length was perfect @ .433 but outside diameter @ .400 was way to small. Maybe extra length won't affect anything and I will just run the GROVTEC
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  #6  
Old 09-07-2021, 12:29 AM
Mike_AK
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Quote:
Originally Posted by kabong57 View Post
I have a CMMG 16" M4 barrel inbound for a build . Would any one know the outside diameter of the barrel at the muzzle end ? Would like to find a 1/2-28 thread protector that doesn't look to hideous.
I just used an A2 flash hider without a crush washer tightened finger tight with some blue Loctite on my Lothar Walther barrel. It timed up perfect.
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  #7  
Old 09-14-2021, 08:46 PM
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langenc
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I like Grovetech products.
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