Bigfuzzy
Well-Known Fanatic
I am new to building ARs. Have no problem with lowers.(so far). my 2nd upper build will not complete the cycle. does all of the cycle except for the last 1/4 to 3/8 of an inch.
any idea as to the problem so i know what to look for? the lower runs fine with other uppers.
any idea as to the problem so i know what to look for? the lower runs fine with other uppers.