![]() ![]() There is a dimensional relationship between the barrel face, the shoulder at the end of the threads, the face of the receiver and an internal shoulder. ![]() The older barrel threads (pre-855,000) had a pitch to the threads, just like on a bolt. The newer POST 855,000 barrels are interchangeable. Is there any truth in what he says or has he been miss-informed? He says that pre-855,000 guns are interchangeable with other pre-855,000 guns based on how old your barrel and shotgun are, but I have heard this is false from a variety of forum members and old timers at the gun club.
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