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AM180's are great little guns, but you have to keep in mind, they're spitting out nearly 30rds/sec - its a finely tuned piece of machinery. Last weekend was only the 2nd time Mike had his out, so he's still learning the quirks of his gun. I think his problem was his ammo though. Mine had one or two stoppages, but they were on the very last round in the drum. Probably an extra 1/8th of a turn on the winder would fix it. Once you figure out the particular quirks and idiosyncracies of your particular AM180, you can get them to run like a top. You have to remember there's a lot of things that will cause an AM180 to jam up - they run extremely fast, and use a particularly dirty little cartridge. If you don't know what to look for, you may never figure it out. They can be very finnicky about ammo (mine will only run cheap 40gr Federal HV) - some guns wil run other types of ammo, others won't. It all depends on your particular gun. The winding mechanisim must be properly wound - too much or too little tension and the gun simply will not run. The feedblock must be properly seated against the receiver. If it isn't, the gun is useless. There's a lot of other things to look for, but those are the basics. If you really have problems with them and can't figure it out, Val Cooper at E&L Manufacturing is the absolute guru on AM180's and can get ANY Am180 to run. Send it off to Val, and the gun will come back running like a champ. Last summer at a line shoot, I put almost 2500rds through mine without cleaning. It had a few jams, but it only developed reliability problems after it passed the 2000rd mark. Try getting 2000rds through an M16 without a jam ...and without cleaning it.
I love mine, but I wouldn't recommend one to someone for a first NFA gun, unless they really knew what they were getting into first. If you go in knowing there's a bit of a learning curve with AM180's, and can accept that fact, you'll be fine and you'll have a gun that will very quickly become your favorite toy.