Michaels machines. I believe he uses a PTR and rolls his own flats. When I first got it I asked for a refund. Had canted front sight, couldn't zero it even with maxed out windage/elevation, and it didn't run. The top pic rail was out of spec - couldn't use a geissele mount for instance. After a year of shipping it back and forth and some big arguments with Otte on subguns, he finally built a whole new receiver. That was January this year, and I got it back last week. Still doesn't run, although the front sight is straight and the pic rail is in spec.
I have tested it a bunch since getting it back and videoed all of it, and now he's replacing the whole feed (a couple pins fell out of it on video while shooting).
The main issue is that the bolt carrier is smashing the next round down onto the feed lever as it goes rearward, and it crushes the case neck/bends the bullet out of alignment, so it can't be chambered. Sometimes it won't feed the first round of the belt either. This happens quite often.
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