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new barrel break in question

kingfamous

Private
Full Member
Minuteman
Dec 12, 2010
45
0
53
just got a new 20" upper and manufacture said to break in the barrel. I know everybody has there opinions on break in, but does it matter if I use the cheaper fmj's to break in the barrel or do I need to break it in with what Im going to shoot, the 69 smk's.