Quoted:
Gun details:sa&a lower
Daniel defense 16 in barrel
Yhm free float rail
BCG is dpms
I've tried swapping this upper on a functioning lower, with a different BCG and still the same problem.Load a round, fire, ejects shell, then click, fail to freed.I have also upgraded the extractor with bcm parts and still same problem.Any help?
Thanks
Use the function B/C from the function lower as well in the new upper for a single loaded round in a mag to see if the bolt will lock back on the mag catch after a single fired round.
If you have problems still, the go back and clean the upper again, including the chamber with a chamber brush by hand with CLP, and with the bolt pulled off the old carrier, use the carrier alone in the upper to double check the alignment of the key to gas tube and to confirm that the carrier is not binding in the upper. This will at least narrow the problems down to either a bad head space, or leaking/blockage somewhere from the gas tube to the barrel port.