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Choat barrel extention ?


Picked up a 935 a couple days ago. I was considering a 930 for self defense but ran across this used. It has had the barrel cut down very professionally and a choat magazine extension tube.

I am not sure how many rounds it should hold. It looks like standard is 4+1. The tube holds 6 2 3/4 shells but is tight. It looks like some folks need to cut the spring.

Question The extension is about 7" measured. How many should that be? If I need to cut the spring how far is to far?