Decided i better do this today, may be a while before i can again. it run the SGM and a korean mag just fine. it did not like the ETS mags. jammed twice in ten rounds so i changed mag. i took a regular glock pistol mag but didn't use it. i figured it would have run it fine too. Ran everything suppressed. the one target where a bunch is to the right is sighting it in. was kinda fast firing a bit. not real fast. I was pleased with it, might be fun with an FRT in it.