Did some reading, plus my dad loves this round in his new XP-100 (originally he was going to turn it into a 6mm BR, but changed his mind), and I statred to think it would make a pretty fun round in an AR-15. Obviliously you'll need a newly chambered barrel, but what else would you need to do to the AR? Would you have to modify the mags to get it to chamber properly? What about changing the recoil spring? Do you think a 1X9 barrel twist would work well on the 40-60 grain bullets at Fireball velocities? Any insight would be welcome.
