I have one in the M2 12ga and never touch it..It shoots everything from dove loads to turkey loads.
I just ordered one for the M2 20ga and was told by a friend not to shoot the extra power spring if I was shooting light loads.
Haven't messed with the hammer spring but I am curious about it.
If you get one,don't get your finger in the way of the action..I would say you would be down to 9 1/2 fingers.
They slam hard,I like it.
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