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sigshepardo · January 27, 2013, 10:27 PM

.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.

January 27, 2013, 10:27 PM	#20
sigshepardo Senior Member Join Date: July 18, 2011 Location: North Eastern Indiana Posts: 118	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.