08-10-2020, 02:22 AM
bigdaddyjak Wrote:New build only a few rounds thru it . 20 barrel rifle length gas. Low pro non adjustable gas block ,Mil-spec carbine buffer , spring and adjustable stock . Lubed well, gas block, gas key , everything is lined up . Has been checked , swapped out gas tube and block , swapped lowers . Tried 3 different magazines , still same problem. First shot, then it short cycles . It will eject the spent casing but wont fully engage, causing a misfire . If I just load one round , instead of bolt locking back on extractor face, bolt catch is holding bolt back , therefore extractor is actually hanging over empty magazine . Only think I can come up with is that it is under gassed. Gas port seems to b 3/32 ( thats what size bit fits hole). Thanks for your time !
Undergassed and overgassed can have the same effects.
How does the gun react during recoil? Is it harse feeling and does it sling the case out hard? Where does the case land? And how far away?
At first blush it sounds undergassed but it could be overgassed as well.