hunting upper
 

what is the biggest caliber upper that will fit on the 5.56 lower? is there a .308 that will fit it? what is the 300 blackout?

.50 beowulf

.458 socom.

40mm grenade launcher

12 gauge.

50BMG is the biggest.

my preference is for the 458 socom for hunting its on the same level as a 45-70. second would be the 6.8 or 300blk.

here is mine in a couple different configs:

http://img39.imageshack.us/img39/1773/img0294hb.jpg

http://img191.imageshack.us/img191/8618/img0299w.jpg

http://img403.imageshack.us/img403/1489/img0406z.jpg

strongly considering.....

I was going to go with the 40 mm but it might make me look like i'm compensating for something so i went with the .458

http://www.glovesandclover.com/ar15/458socom/sbr03.jpg

Caliber: 405 gr 458 SOCOM - CORBON
Energy: 2303ftlbs

Caliber: 62 gr M85 5.56 - Lake city
Energy 1280 ft lbs (Just over 1/2 the power)

This thread got me all riled up so i just took 2 quick pics
http://www.glovesandclover.com/ar15/...58_nikon01.jpg

http://www.glovesandclover.com/ar15/...58_nikon02.jpg

Don't forget the 450 Bushmaster. It'll kill anything up to and including the big bears out to 200 yards and beyond. People say it uses handgun bullets only but that ain't true. The factory Hornadys use the FTX bullet which is a rifle bullet and there are others. This is a great round and hand loading for it is a breeze. Factory ammo is way cheaper and easer to get than the 458 or 50 also.
The 308 will not work on the AR15 platform, you have to move up to the AR10. I don't know much about the 300 Blackout, you'll have to Google that.