12-08-2014, 08:51 AM
If you really want to make a polymer mag, use the Colt 901 lower receiver and a new upper. You could use a 2.5" COL if you really wanted to. It'll be a one-off, needing a different reamer.
NRA Basic, Pistol, Rifle, Shotgun, RSO
CCW, CQM, DM, Long Range Rifle Instructor
6.5 Grendel Reloading Handbooks & chamber brushes can be found here:
www.AR15buildbox.com
CCW, CQM, DM, Long Range Rifle Instructor
6.5 Grendel Reloading Handbooks & chamber brushes can be found here:
www.AR15buildbox.com
