I recently purchased a 12.5 inch ARP 6.8 SPC barrel and sent it off to be cut to 10.5 and threaded 5/8-24 issue is it was a mid length gas system and I thought it was carbine so he could only cut it to around 11.5 and threaded it 5/8-24. I already bought a new 10.5 in barrel carbine length gas system. He fired 10 rds through it to test the function and that is the only rounds through it. Barrel has one little scratch close to where the barrel nut goes. I paid 190 for it but I'm willing to sell for 160. I can meet within reason of Killeen/Ft Hood area or ship on your dime and I can accept paypal. Also cross posted on other sites.