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Old January 27, 2013, 09:27 PM   #20
Senior Member
Join Date: July 18, 2011
Location: Indiana and Virginia
Posts: 128
Yes Sir!

.458 uppers will fit to basically any standard lower. I also know that 20 round 5.56 mags will hold 7 rounds of .458. No modification necessary. I have used a .458 and I can say that it is one of my personal favorite calibers.
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