Whichever one you go for, just don't use Nuprol RZR bbs like I did and bugger up the gun... Thankfully it's an easy fix costing £30 for the nozzle and £10 for a new hop rubber... but still that's beer money used up!
One point to consider, how easy is it to get hold of the AK MWS mags? I'm sure when the AK is released they may be available from the usual sources but you never know.... Also let's face it, that MK18 looks the dogs danglies....
Nothing to worry about it.... just press the bolt stop and release the mag.... I'm sure mine did the same too when it was working.... the MWS is not like a namby pamby AEG. This is a real mans gun who has hairy fingers and bigger muscles in their fingers... 😆