I got a picture of some cut weapons from Vegas 1 and 2. Not sure if you guys saw this. It was found among the files of the PC version.
I'll name them all from left to right:
P226, UCP, UZI, SR-2M, USAS-12, SAIGA 12-K, MOSSBERG 500 Cruiser, PKM, ULTIMAX 100 MARK 2, M60E3, SIG SG 550 (Some sniper variant of it), and the AS50 (Without a scope for some reason)