9mm para(not luger), .40s+w and .45acp.
Interesting poll, I am currently working on a dedicated 9mm and .45 AR lower receiver, utilizing the oly arms style pistol cal. uppers, using inexspensive sten mags and grease gun mags. These lower receivers will not be compaitble with Colt style uppers and it won't be a .223 receiver with blocks pinned in. The mag well is machined for pistol cal. mags ONLY. A truely dedicated pistol cal. AR carbine from the beginning. These are still in development right now.. i'll keep ya'll posted as to when they are available.
SNS Industries, Inc
~Mfg. of quality AR15 style rifles.~