The 50 THUMPER is not a little to long for the AR its a LOT to long and big for the AR.
We are just getting the info on the 338 THUMPER put together. As I get more information I will post it here. The 338 uses a 223 case cut back to the start of the shoulder and you stick a 338 bullet in it. It uses standard 223 mags and bolts. We will be carrying dies for the 338. We will be selling uppers and not full guns. We are not sure at this point if we will sell just barrels or not.