Cycling 58g bullets

[r.tenorio671]

I’ve been fighting with a similar problem with a 22 inch barrel with a rifle +2 configurations.  I have sent my barrel back to the OEM they can find nothing wrong, as it cycles with the factory ammo but on my reloads using 87 Vmax is with a full load of varget it will not cycle. I can get it to work with 87 and heavier bullets with B3L-c2 and cfe 223.  I have been contemplating opening  up the Gasport a bit to try to get it to improve.  I have tried A mil spec rifle lower using a Sprinco Greenspring, a carbine  lower using a normal buffer, and a valtor A5 down to a H0 weight. I have Even tried 2 adjustable and 1 fix gas block. Of the three gas blocks the suplitve worked the best. With the valtor combo working the best.

Could you supply the exact size of your gasport measured with a plug gauge if you have that
available? Can you verify alignment via borescope too? My own specs will be gathered soonest
for comparison. The weight of your complete BCG is important to.

Here's to solving the mystery..   Badger

I do not have a bore scope, but was able to see the shadow on the barrel was centered when pulled the gas block off. I do not have any pin gauges at this point, but have been thinking about getting some. I should have the barrel back in my hands from shipping on 3-17.

...as an expedient measure, you can use drill bits in place of "pin gauges", just try fitting them in the gas port until you find one that drops down into the hole.