I sold my M40 at a show last weekend ($400 w/ 6 mags), and Thursday I picked up my new M9A1 ($458 out the door). Basicly I was shooting about 5 times as much 9mm in my S9 due to the cost, and using the 40 only for outdoor IDPA matches for the longer sight radius (indoor idpa it doesn't matter as almost no stages are over 10 yards). So the m9 would be better suited to the role and the only way I could afford a new gun is to sell one. Did a quick field cleaning job and headed to the range on Friday w/ four marked magazines (the two that came w/ it and the two M9 mags I use as my extra S9 mags) and whatever 9mm I had at the house. First up 47 rnds of wwb 115gr FMJ..... NO Issues, really liking the gun Second up 50rnds of CCI Blazer (aluminum) 115gr FMJ....... 1 FTE, round stuck in the chamber pretty good. The case was not bulged and all spent al and brass looked good. But hey, it's aluminum and 1 out of 97 ain't bad for break-in period. Still liking it, and not concerned. Third up 100rnds of the same WWB 115gr FMJ ...... NO FTE"S, but this is where the fun starts.... By now I've moved on to doing some Hammer Drills*. Could've been my imigination, but it sounded like it might have doubled (Remember I'm pulling the trigger FAST) but all rounds on paper (-1 zone on IDPA target). Then for the last three mags it's rapid (but sighted and controlled, so not blazing fast) shooting at about 8 yards. DEINITELY NO MISTAKING THE FULL-AUTO EFFECT NOW. Don't know if it was 5 or 6 rounds, but it was one of those numbers as it happened mid mag and did not empty the mag. Not the same mag as when it doubled earlier. There was a hole on the top right portion of the target about 3/4 an inch in diameter so most were at the backstop, but I definetly saw sparks of, I think, 1 round bouncing off the ceiling baffle plates. THANK GOD I was indoors w/ deflector plates to keep errant rounds in or it would've been over the berm and into the wild blue yonder. The final few went bang no problem (in SLOW fire w/ a death grip on the gun to see if it would happen again). I WOULD LOVE A M VERSION OF A G18, BUT GUNS THAT ARE NOT DESIGNED TO GO FULL AUTO SHOULD NOT DO SO!!!!!! Now do I try to go shoot it again as is and see if the issue repeats itself (the shop dude's recomendation)? Or should I clean the ever loving bejesus out of it in all it's individual little dissasembled pieces and hope it doesn't happen again? I did strip the FP on the spot and saw no signs of brass flakes in the channel. If I do this it would be at least a 1000 problem free rounds before I would trust it at an outdoor match (this gun will be primarily for IDPA use as I have the S and my little j frame for carry). Or just back to the factory right now (if i don't do this immediately I WILL if it happens a second time after cleaning and inspection)? For now I have a $458 pistol case filler holding the case down in the closet as far as I'm concerned. This is the first time I've had a gun I don't trust; it is not a warm fuzzy feeling. * Hammer Drill is six shots as rapidly as you can pull the trigger point shooting (for me I do it at about 6 yards). Basiccly it's an exercise to see how well you're handling recoil by seeing you'r group size. Thanks to IDPA Steyr for teaching me this one.