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Dacapster
01-18-2011, 08:18 PM
Does the upper need the M4 style cuts or are they a waste on the 30 cal projectile?

pud-knocker
01-18-2011, 10:39 PM
Does the upper need the M4 style cuts or are they a waste on the 30 cal projectile?


I have both and have never had problems with either.

Hoser
01-18-2011, 11:16 PM
Cant hurt, might help.

srm109
01-18-2011, 11:30 PM
Mine has an M4-type barrel extension, but a standard-type upper. No problems so far, a couple of thousand rounds.

You could always use a Dremel or a chain saw file and carefully notch the reciever to match the barrel. Probably won't make any difference, it's such a small amount of material.