Thanks for the replies Steven and chaosnemesis; I've tried a couple of those solutions (including filing down the spring-loaded retainer and adding tape to the recessed portion of the mag catch) but unfortunately the issues still occur. The first 5 or so shots on semi will fire, but the mag simply won't feed afterwards.
I would disassemble the mag and stretch the spring, but unfortunately i can't seem to crack one open once i remove the actual mag portion from the outer aluminum shell
I've heard that some mid-caps require a "break in" time period before they're used. The mags look very new, so is this the case? I've heard from other people with similar problems that they should fill the mag and leave it overnight or something to weaken the the spring a little... is this something I should try?
If anyone has experience with these mags, or with the CA SCAR-H in particular, I'd appreciate your input. What mags do you use?