I bought a 1927a1 commando back in dec. First time out I had a crappy 10 round drum with me, till I could find a preban 50 rounder (all we are allowed to have here), and jammed alot with it. took it apart noticed the bolt was dmg'd, and feed ramp was bent. sent to kahr wed, had it back by Monday, they replaced the bolt fixed the feed ramp. I replaced the wood with original savage m1a1 wood, put in Dan Blocks ez pull springs, and fell into 4 original seymore and bridgeport 50 round drums. Took to the range and ran flawlessly through the 500 mixed rounds of ammo I had (winchester, federal, wolf). I got the local PD to sign off on my form 1, so now waiting to have the 200 to send it in to convert to a proper looking SBR, as had an emergency vet bill to deal with. over all im happy with it, and looks great next to all my other original US WWII firearms.
BTW is it an aluminum receiver or steel receiver tommy? personally id stick to steel, but some people dont care.