I have just finished a 14.5" .308 Mega Arms build and am having some issues. The barrel I used is a Red X Arms Stainless 1:10 RH twist 16", diamond fluted bull barrel. We crowned the barrel and reamed it out (professionally done) to 14.5" actual barrel length and ported the barrel. The barrel is chambered in .308 and I am shooting 168 gr Hornady Tap and I am using a .308 carbine buffer and spring. But I am having issues with stove piping. The spent casing is not ejecting completely from the chamber before the next round is fed forward. So I immediately thought it was a gas issue and we drilled out the gas port 1/1000th larger and it is still doing it. How large/small should my gas port be? Could I fix the issue with a lighter buffer? Or remove weight from the buffer I am currently using... Ideas? Insight?