Hey guys I know nothing about AR's I was wondering if any upper would fit on any lower. I want a 17 rem. did't know if you could get a upper and just slap it on a lower or if their is much gunsmithing involved. Thanks for the help... Mike
Thats exactly what you do, and Specialized Dynamics is haveing about the best deal on a 17 remington upper ever!
I'd email Scott and see if you can still get in one it. You cna go to his site in the link below me sig.
If you mean a .308 Winchester, the someone was right. You'll need to go to an AR-10 for a .308 Winchester length cartridge. There are a few shorter .30 caliber cartridges that will work on an AR-15 lower though.