I want to put a shorter barrel on one of my J's.

Same thread. It will work.

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Thanks, I'd heard the some of the non pinned barrels referred to as having "crush fit threads". Didn't know if that meant the barrels were different.

It has to do with where the shoulder is. The pinned barrels had a shoulder set so the barrel hit with the sight just a few degrees off of top dead center and little force was needed to put the sight in the center. The pin was counted on to hold the "not all that tight" barrel in place. The crush fit barrels have a shoulder that hits the frame sooner, and are designed to be tightened much tighter creating the "crush fit" that assures the barrel will stay tight. If you are putting a crush fit barrel onto a pinned frame, it is advisable to relieve this by setting the barrel shoulder back a bit so it is not so tight (read:"don't crack the old frame by overtightening the barrel") and then drilling for the pin and putting the pin back in.

If you are going the other way, and putting a pinned older barrel in a non pinned frame, it is not likely to tighten up enough to stay put without the pin. Either set it back a thread and leave it so it will crush fit, or drill your frame and pin it.

Louie

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Louie the Lump
NRA Life