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1/25/2018 7:38:29 AM
Posted: 9/9/2003 2:33:05 PM EST
I was wondering what was the difference between an upper in 50 Beo or even .458 Soc and a regular plain vanilla 5.56?

Seem to me, just get a barrel and a bolt carrier....But I am often wrong.

Link Posted: 9/9/2003 3:04:41 PM EST
Ejection port is opened up a bit, bolts for the 458 SOCOM are custom machined.
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