BE CAREFUL - if your receiver threads are too damaged, you could damage your barrel threads to match - not a good thing. If they are, then a thread chaser or actual re-threading may be needed. This technique MAY not work - if the threads are too buggered. It is NOT final fitting of the barrel - so, if you get it all the way in this way, DON'T just torque it down and decide that you are finished. Understand, this is to chase the receiver threads.and get the barrel TEST fitted. Working this way, you MAY be able to chase the receiver threads, by using the BARREL threads. Check for any debris or bits of shaved metal, etc.clean, re-lube, then try it again. Stop often, when it hangs up and back it out. After checking everything carefully, try this first: heavily lube the barrel threads (even a thin grease for this purpose will work).then slowly screw it into the receiver, a bit at a time, under more than hand pressure. You MAY need to obtain a suitably sized thread chaser and work over the receiver threads. The reason you are having trouble in screwing the new barrel into the receiver is probably that the threads are damaged. "Crush fit" is a bloody STUPID technique - period. Unfortunately, the old technique of fitting Mauser barrels with a "crush fit" tends to damage the receiver threads (compresses or "crushes" them). First, check the threads on both the new barrel and the receiver. Now that you've got the old barrel out.a word about installing the new barrel.
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