rugerboy10
Works perfect with my “T-Rex” carbine (Aero lower, BCM upper). Some hiccups (don’t always fall free, feeding last few rounds) with a cheaper Anderson lower and upper build. Not the magazine fault. Just good to keep in mind if buying for a “cheaper” carbine. Magpul windowed mags might be better for that. My favorite, each of these mags comes with a card about mental health resources for firearm owners and make great book marks.