Got ha. I was just curious for when I just need a shot or 2. Don't always need a full load.Not that I'm aware of. "CTR" Compact Tactical Rifle. Get a T3X lite if you want small cap mags.
I believe you can install a standard T3X bottom plastic, mag retention clip, and use low Rd count mags. But the whole dbm 10rd metal mag is what ctr was built around.