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I have been trouble shooting my M1 West Hurley for a while. The seller reported the gun was re-finished (parkerized and GI parts) in the 1990s by a smith named Gerald Macdonald of Selma AL. Supposedly ran perfectly, with the “Hurley bugs” worked out. Upon receiving the weapon I found all parts were GI except the barrel, upper, lower frame, and magazine catch. The gun suffers from fail to fire (light or no primer strikes) on occasion. This is worse with certain magazines. Semi mode suffers from these failures more often. Admittedly some of this could be from shooter inexperience with open bolt guns, but it seems to happen enough where I suspect the bolt is getting an abnormal amount of friction some where. I have been slowly replacing parts in an effort to find the problem. The gun came with a GI M1A1 savage bolt. A M1 bolt did not solve the problem. A NOS recoil spring (notably about an inch longer than what was in the gun) did not help. I replaced all the lower parts. The bolt used to get stuck forward in semi mode, a new rocker seemed to have fixed that issue (of note is the old rocker had a lot more “slop” to it – the old one was GI. The new one is more solid so the old must have been worn). I finally picked up a GI mag catch and had it parkerized to match the gun. I replaced the catch (and learned that catch spring is a pain to remove) and found the mags now sit higher in the lower, and the mags will not seat when the gun is assembled. The WH mag catch appears to have some filing around the catch protrusion so I suspect this was hand filed to make the mags seat reliable. Below I have included some recorded dimensions in hopes that someone with more experience could confirm if my GI mag catch is within tolerance. I think the problem might be the mag catch hole location in the WH lower. Last year while trouble shooting at a local shoot, board member “mnshooter” allowed me to try using the M1 complete GI lower from one of his guns. That lower functioned flawlessly with my WH upper (and the mags seated reliably). If anyone has a stripped GI M1 lower I would be interested in purchasing it. Sending to PK is on the radar if I can’t get this going on my own, but I think I am close to the remedy. Here are some pics of related dimensions, taken with a dial caliper (comparing WH to GI catch): http://i1303.photobucket.com/albums/ag143/kb0uxv/lower%20hole_zpsrolfhbl5.jpg http://i1303.photobucket.com/albums/ag143/kb0uxv/LATCHES_zpssdzha1q0.jpg http://i1303.photobucket.com/albums/ag143/kb0uxv/LATCHES3_zpsiawmekao.jpg http://i1303.photobucket.com/albums/ag143/kb0uxv/LATCHES2_zpsnbj5yevl.jpg