Why? AR lowers are ludicrously cheap and common. You're going to need a generally "rifle-like" form factor for ease of use, so why not go with the most common d

Why? AR lowers are ludicrously cheap and common. You're going to need a generally "rifle-like" form factor for ease of use, so why not go with the most common design, and save money on things like pistol grips, buttstocks, etc? And the manual of arms is known to everyone who'll be using it.