This is my story about a very good friend of mine and I's experience trying to install a new BCM A3 receiver on an existing Bushmaster upper that I owned.
I purchased a Bushy M4 right after the ban expired in 04' from my local Academy store mostly out of celebration and at the time the price was right $799.97 and home it came with me. Now at the time I didn't care but it was an A2 so I purchased a Trijicon Reflex II for it and it installed with their "goose neck" mount and life was good. Well here we are today and I had several projects going on and wanted to convert it to A3 so I ordered one of Bravo Company's recievers and once again life was good. A few weeks after I had the parts together I took it to my buddy's house who has all of the necessary tools and fixtures to be our AR "doctor" and we set upon it. At first everything went smoothly disasembly went quickly but then disaster struck when both of his barrel wrench's would not loosen the nut!! We had to apply so much torque that the wrenchs were shearing the teeth off of the nut ahhhhhhh! O.K. plan B we then thought solder or thread sealant was the issue so out came the MAP gas torch and we heated the receiver and barrel up pretty good. Still no luck!! OK Plan C the Dremel came out and we spent an hour cutting the barrel nut off what the Hell!! After finally getting it off there was no thread sealant or anything we could figure that would cause this. Therefore our conclusion was that it was a P.O.S. non spec nut that Bushmaster installed. Well fear not we had a spare nut and the new reciever went together slicker than "greased Owl shit". Anyone else experience anything like this?

