Barrel diameter

Discussions on all the Black Rifle variants of all calibers and manufacturers.
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FFC666
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Joined: Sat Jul 21, 2018 5:15 pm

Barrel diameter

Post by FFC666 »

I have a Smith & Wesson M&P15 and I am looking to replace my handgaurd and (of course) replace the gas block.

I dont have a micrometer and cannot get an accurate diameter of its barrel.

Anyone know what the outside diameter of the barrel of the M&P15?

Thanks!
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Tenzing_Norgay
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Location: Your mom's house, Trebek!

Post by Tenzing_Norgay »

Almost every "standard" AR barrel is .750"
- I can explain it to you, but I can't understand it for you... -
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Lastrites
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Post by Lastrites »

Unless you plan on keeping the front sight tower for some reason you could always just modify/chop off the tower and the bayonet lug and have a perfectly functioning pinned gas block. Your gas block journal should be as mentioned .750.
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Big_mike
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Post by Big_mike »

Lastrites wrote: ↑Thu Jun 25, 2020 4:07 pm Unless you plan on keeping the front sight tower for some reason you could always just modify/chop off the tower and the bayonet lug and have a perfectly functioning pinned gas block. Your gas block journal should be as mentioned .750.
+1, this guy knows.

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