Hola,
Well my son in law put together an AR-15. He used a Tennessee Arms polymer lower and a generic parts kit. This was not from Tennessee Arms, not sure where. The upper was a generic, fully assembled upper (with BCG and charging handle) from PSA. At the range he put a standard (metal) AR-15 mag in. It went auto. It fired until he let off the trigger. Needless to say we bagged it until we could get home and then dismantled it. I told him I would take a look at it but was wondering where I should start. The upper ran fine on my AR-15, just to verify that. The rifle was not function checked after it was put together and before it was test fired. I would like to think that it is something in the trigger group but is there anything I should look at concerning the lower receiver itself?
Gracias
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