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Old February 11, 2013, 06:35 PM   #4
Senior Member
Join Date: November 20, 2008
Posts: 10,534
My older Colt Sp1 Carbine has been shot very little, and the A2 forged upper receiver hasn't been shot at all - both are forged, older and very smooth to the touch on the inside. Perhaps this doesn't matter, and maybe after using some lube and shooting the newer receivers it will smooth out some. I just found it odd that there would be that much difference in the texture inside the receivers.
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