I also have the M40 and the M40A1
My "M" also sent one back at me every few rounds. After about 450-500 rounds it seems to have stopped.
My A1 has been perfect. Great guns ............Welcome to the club
My "M" also sent one back at me every few rounds. After about 450-500 rounds it seems to have stopped.
My A1 has been perfect. Great guns ............Welcome to the club