The American 180 Lexan drums in 177, 220, and 275 round capacity are used on the AM-15 upper. This is the drum's feed scoop that was blown out from an OOB round. Federal 333 round bulk pack ammo which is NOT the same as Federal 525 or 550 count bulk packages. All my Lexan bottom plates were eventually replaced with aluminum ones from E&L Manufacturing that actually seemed to function better. At any rate, I didn't loose a hundred dollar drum due to an OOB but rimfire ammo's method of ignition coupled with an open bolt subgun increases the risk of an OOB.
The "run on" you see in the video had never occurred before or after that day. It seems like anytime you shoot a match, your perfect gun turns to crap. I see it on a monthly basis at our subgun matches and I've learned several new and colorful expressions to express extreme displeasure over a malfunctioning subgun. :x
If you look very closely at six different brands of .22LR, you'll notice that each bullet is slightly
different. Even ammo from the same manufacturer will be different from one line to another if you examine it closely.
Getting most brands of rimfire ammo to run in semi auto is pretty easy. Full auto isn't, and I suspect you'll quickly figure that out. Once you find the right ammo/magazine combination things can be fun but it can be a chore getting there.
Most full auto .22 LR guns run very fast and that only compounds the problem. I hope you don't have any issues and this little beast and it will run on anything. All I'm saying is I'd try to have as many different brands of .22LR ammo on hand to maximize you potential for success. CCI MiniMag is spendy, but I'll bet it'll run when others don't and it's still half the price of 9mm. Yeah, I know everyone wants to run the cheapest bulk pack they can find, but it doesn't always work out that way.
I noted the suppressor in the photo and increased back pressure may or may not be your friend. I'd try it both ways with every type of ammo until you find the sweet spot. IIRC, I gave you some Eagle mags. I was briefly a local distributor and I still have the better part of a case. Many Akins Accelerator owners found these cheap mags worked well but we also discovered the wide variations in the way Ruger 10/22s are built. Heck, today's models use a plastic trigger pack!
I look forward to photos and a range report.