GETTING MY WHERE TO BUY AMMO TO WORK

In the first one hundred I'd a fired shell jam And so the motion couldn't even open up. This was my S&W M&P nine which cycles Something. Had to hammer a screwdriver down the barrel. Every thing fired good once more until finally a bit around 300 rounds and had a similar sort of jam, other than it was Reside! I whacked the gun versus a table about 1