I recently acquired a nice M1884 Trapdoor Springfield. Good wood and metal, very clean bore. Buffington sight in perfect working condition. Only problem was the receiver was cracked in the usual place - in front of the extractor groove. I thought, "No problem, I'll just take off the old receiver and install another one from the same serial number range." Famous last words! The barrel was a royal pain to remove from the receiver, but I succeeded with patience, a homemade action wrench, a little cussin, and a long soak in acetone and ATF. I then went to install the replacement receiver and it will not thread on far enough to line up with the index marks on the barrel or to bring the sights to the correct position. I cranked so hard that I bent my home made action wrench. The receiver and barrel are not indexing by about 10 degrees. Is the solution to carefully file some of the barrel face ahead of the threads? Or, am I going about this the wrong way? Thanks! Dave