@PappyM3 ok thank you. I will check that out. I am gonna use the carbine and see if that helps at all.
@whatluck I will check that out. Thank you.
@paul73 ah man. Ok. That stinks. Did you ever get the rifle length running well? I will do the sharpie to double check. I did run air through it after installed with compressor and got a lot though. If I was to enlarge it. What would be an appropriate size to enlarge to?
@Tallahassee I am gonna throw the lighter carbine in and see how she does.
i did not get good accuracy from my reloads on faxon and just returned it. and it was not critical for me to make it run properly on light 7.62 ammo, as i run only 168gr and 175gr bullets.
overall the 308 build is more picky to a particular ammo type and is more difficult to be 'universal' the way almost any .223 build can be.
if you want something that would run on anything you shove into it - i would look at medium length port barrels. that is what i got back to, and it cycles everything for me.
a carbine would be too short.
enlargement of the gas port in the barrel is a tricky task, as, obviously, it is not reversible. and it really will require an adjustable gas block as well to control the gas.
there are videos on youtube on that topic, but it is not something you can do with a hand drill, and, it is, again, something that may end up with you needing a new barrel.
plus, again, the whole deal is - you may get enough gas to cycle on the weaker ammo, but the heavier 308 175gr ones will smack the hell out of the gun. i would try to play first with different buffer and spring. but i have to say - i had a rifle and carbine buffer length lowers, none of them would cycle with that faxon, so i concluded its port was a bit too tight.
seriously - where did you get that faxon? just return it if it is an option. primary arms still has medium gas ballistic advantage builds. grr, they sold out on 18", only 16" are left. it would still cycle on anything, but, a 16" on 308 is a bit short for my taste.
DetailsAero Precision M5 Barreled Uppers are changing the way you shoot large calibers out of a semi-automatic AR-10 platform. The AR-308 platform is not as plug and play as the AR-15 platform and can be a headache when building a gun from the ground up from different manufacturers. Solve that...
www.primaryarms.com
Ps. It was same exact barrel btw, a pencil 18” faxon, and it closed on a 308 no go gauge as well, that did add to my happiness. So it went back to opticsplanet.