Yesterday only I was talking about this but left this specific point as I wasn't able to pinpoint the exact Chinese OEM
It's like HS503R in terms of the basic implementation of the concept but there are few differencesVortex's Crossfire II is $130 and SPARC is $160
SIG Sauer ROME5's $150
And Primary Arms SLx would be $150
Our "IDDM" industry, especially defence & aerospace is a case study on how much you can milk the customer