I bought a "converted by bill fleming" Colt Sp1 Reg Receiver recently. Form 4 came through and I took possession on Sunday evening.
It has a Tapco 4 position FCG in it.
I took it out today to test it out. Mated it with the upper from my Factory LMT MRP Piston 12" SBR.
Fired great in Semi. Safe works too :)
Auto fires a single shot, and then the trigger doesn't reset. If I put the selector on Safe (I can hear the trigger reset) and then back to Auto, and pull the trigger again, it fires another single shot. Rinse and Repeat.
Same with Burst.
It had the same problem with or without the suppressor on it.
Possible solutions?
1) How do I tell that my LMT 12" upper has a full auto bolt? I was told that it does when I bought it but never verified as this is my first M16 out of the Corp... and it is a piston upper to boot so I am even less experienced there.
2) What could be wrong with the lower, if anything?
3) the upper and lower are an EXTREMELY tight fit. I have to put in the front take down pin and then push the lower down in the back hard and then push the rea take down pin in.
I have no other uppers with full auto bolts.
The Upper works fine for several hundred rounds through it on the Factory SBR lower from LMT.
Thanks in advance for your assistance.
Semper Fidelis,
Kent