Welcome to the forum rmkelly, I went to the Colorado Aero Tech there in Broomfield back in its hay days. I imagine its about shut down by now.
There is a lot of discussion on reliable, as well as unreliable mags in this forum. You might try using the search button in the upper right of your control panel, and enter a mags brand name, to see what comes up on it. Your key words will appear in Red.
I bought some PMI mags, that work well. One thing, most after market mags have in common, is if you load them to full cap. They won't fit with the bolt closed, and the first couple of rds may not feed well. Try leaving a couple of rds out then try to see if they fit.
There is a lot of discussion on reliable, as well as unreliable mags in this forum. You might try using the search button in the upper right of your control panel, and enter a mags brand name, to see what comes up on it. Your key words will appear in Red.
I bought some PMI mags, that work well. One thing, most after market mags have in common, is if you load them to full cap. They won't fit with the bolt closed, and the first couple of rds may not feed well. Try leaving a couple of rds out then try to see if they fit.