hows about a highter capacity Emag 40? or more?
I use to have some 40rd mags and they seem like a bottomless pit of ammo. That extra 10rds goes a long way. Plus its just uber cool to have a really long mag. They lay flat when carrying it unlike a drum which is in the way and is a pain in the ass.
maybe you can make a 50rd or something with ridges (better designed and snag free)like surefire saiga 12 mags, you can just cut these to size and re-install the floorplate for however meny rds you want. You could also make a connector to add more onto it.
I stole the photo from mississippi auto arms