Weight would be my concern with the VIS would weight...Below is the base weights without barrel, optics, sights or other gadgets.. pretty damn stout I'm sure.. but yikes.



With lower handguard and forward assist unit.
VIS-1 (carbine) - 21.5oz
VIS-2 (midlength) - 25.0oz
VIS-2A (ext midlength) - 26.0oz
VIS-3 (rifle) - 29.0oz