308AR.com - Frequently Asked Questions :

Can I Mix DPMS and Armalite Upper and Lower Receivers

While you can make it work the contours and profiles are completely different. I'm going to call this a NO

Can I Shoot .308 Winchester Ammunition 7.62x51 Chamber

NO. Note: Others will disagree

The cartridges are slightly dimensionally different and do not headspace the same. The .308 Winchester Cartridge operates at considerably higher pressures than the 7.62.51 NATO. The two should not be used interchangeably. My rule of thumb is to shoot the caliber stamped on the barrel. If you are not sure what your weapon shoots consult the original manufacturer.

Can I Use a .308 AR or AR-10 Upper Receiver on an AR-15

NO, The lower receiver is not large enough to accommodate the .308 Winchester/7.62x51 Cartridge

Can a Rock River Arms LAR-08 .308 Upper be used with a DPMS LR-308 Lower

No, the upper is longer than a DPMS unit. View image here

Title

Ipsum