I don't really know anything about either of these products. I googled the ARMS scope mount and the first place that came up was $55. The upper is brand new, with the splintered A forge marking and it does not have the extended feed ramps. It's never been assembled but it has minor storage marks and apparently someone had a charging handle on it for a little while because you can see where it clamped on. It is in great shape still though. I would like to get $140 shipped OBO for both of them.
Excepting partial trade for a one piece scope mount for an AR flattop.
Please email me at email@example.com, I accept paypal (+4%) or MO's.