davsco
Ultimate Member
help please! so i put together an upper. aero m4e1 enhanced upper. 14.5" ballistic advantage barrel. mid length gas. bolt and charging handle out of another upper that's been working fine (16" barrel), full lower (incl buffer & spring) from that same rifle that has been working fine. seekins adj gas block .750.
started with gas adj screw all the way in (closed/blocked). backed it out a full turn or so. no ejection of spent casing. did this a few more times in half turns, and case ejected but only flew a foot or two, new round wasn't chambered. with block all the way open, 4 complete turns out, it stopped ejecting.
i plugged the barrel with a foam earplug and held that in place. put a hex key in the gas tube. put 80psi air down the barrel and the hex key went flying, so seems the block is aligned and air is going thru the tube. i cannot see the gas tube seating into the gas key on the bcg, but in looking at the relation of the front of the bolt to the gas key, and how far the bcg sits, sure looks like the gas tube is going inside the key.
what am i missing?
started with gas adj screw all the way in (closed/blocked). backed it out a full turn or so. no ejection of spent casing. did this a few more times in half turns, and case ejected but only flew a foot or two, new round wasn't chambered. with block all the way open, 4 complete turns out, it stopped ejecting.
i plugged the barrel with a foam earplug and held that in place. put a hex key in the gas tube. put 80psi air down the barrel and the hex key went flying, so seems the block is aligned and air is going thru the tube. i cannot see the gas tube seating into the gas key on the bcg, but in looking at the relation of the front of the bolt to the gas key, and how far the bcg sits, sure looks like the gas tube is going inside the key.
what am i missing?