Glock slimline G36 .45 ACP
Would be interesting if ShieldArms came out with a metal magazine that held a few more rounds, but that would also make the pistol heavier, and at around 27 oz. loaded 6+1, it is a very nice carry.
The Hyve +1 extension with extra cartridge that @EMC45 mentions adds 2 ounces to the G36. I bought a couple complete magazines from Hyve thanks to his recommendation.
Hyve +1 vs. Pearce +0 below
View attachment 1157183
Seems to me that one could make a staggered metal mag, sans rails, and have a flush 6 - 7 round, or 7 - 8 round OEM length.
One would think Mec-Gar could do it, but the G36 seems to be a bit of a pariah in most of the gun world.