308AR.com - Frequently Asked Questions :
While you can make it work the contours and profiles are completely different. I'm going to call this a NO
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.
NO, The lower receiver is not large enough to accommodate the .308 Winchester/7.62x51 Cartridge
No, the upper is longer than a DPMS unit. View image here