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AR15 and M4 rifling buttons
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I am still new but I looked this up just recently and buttoned liners I guess is for lower caliber that mostly pistol caliber b it seems but you can get a barrel on I think it was A.R.15discount I think is the website I think I I see.556 barrel for $16 and up but imagine you would need a bigger barrel press to do those ones cause the barrel thicker showed me more pressure to cold stretch it