Originally Posted by alto8345
Ok, no other difference besides caliber? Thanks
You can make any one AR-15 platform to make interchangable rifles in 204, 223, 221, 6.5,
As for any AR-10 lower can make rifles in 338 Federal, 308, 7-08, 260 Rem, 6.5 Creedmoor, and 243 type calibers..
There are only a few differences between for both of the two, Alto. The magazine and overall length and well, the stopping power.