So, I take my PSA AR9 Glock mag SBR to their range today to test fire it. I got it back last week from PSA after they replaced the ejector (bolt was hitting it).

Seems to work fine with OEM Glock mags.

I also tried a few of the Magpul GL9 17rd mags (date code 11 of 2015).

The last round from the GL9 mags would jam into the bottom of the chamber (feed ramp?). The last round jammed whether I had 2 rounds in the mag, it was fully loaded or anything in between.

I've read of other PSA AR9 owners using GL9 mags with no issues. Guess I'm just special...

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