The fact that it fired 3 times on a single shot before it stuck is a pretty good indication that its related to the on-off and not a level 10 problem. It is more reminiscent of an on-off or possibly a sear issue. Is the rail bushing in place? If nothing has changed, I suspect the problem is an on-off issue. Perhaps there is a piece of dirt struck in an oring.
Originally Posted by codejunkie
Even though it stuck forward with the RT on-off, fire it a few more times to seat the oring and blow out any excess oil.
Except for the Automag in front, its usually the man behind the equipment that counts.