what is the choke on the bbl you have?
featherweights...hmmm, not a good choice for heavy loads. it was intended to be an all day carry gun for bird hunting shooting light bird shot loads.
you screwed up.
m51's had a reputation to melt gas pistons and break carrier rods. if it fails to cycle look there first. basicially, you got a lemon. limit it to light loads. they were discontinued back in the 80's.
featherweights...hmmm, not a good choice for heavy loads. it was intended to be an all day carry gun for bird hunting shooting light bird shot loads.
you screwed up.
m51's had a reputation to melt gas pistons and break carrier rods. if it fails to cycle look there first. basicially, you got a lemon. limit it to light loads. they were discontinued back in the 80's.