So I bought a new DPMS assembled .308 upper with charging handle and FA from Midway a few months ago for my AR-.308 build. I have been buying pieces here and there and today found a screaming deal on a Troy .308 TRX battle rail (with "low" top rail). These are made in a "low height" rail and a "high height" top rail versions as appearently DPMS changed their rail height on the uppers some time in 2009. So I have assumed that I had a "new" version with the "low" top rail height since I just bought it. On the Troy website it shows how to measure and see if it is 1/8" thick (above the charging handle) or 3/16" thick. I figured I would measure it just to confirm before I ordered the Troy rail and WTF? It is not 1/8" or 3/16"! In fact it falls right between the two on my tape measure. So I got out my calipers and measured it and it is 0.168" which is a little more than half way between 1/8" (0.125") and 3/16" (0.1875"). So WTF rail height am I supposed to use or am I fucked either way?
If someone has a Troy .308 TRX rail and knows if it is the high or low version top rail, can you please measure your upper (with calipers) as it shows in the troy website (link above) and tell me what I should use? How does your rail match up?
I also just noticed that the upper is stamped with a "DT" with a dot over the "D" and a dot over the "T" on the bottom of the rear lug (that would face into the lower receiver when assembled). The charging handle is also stamped "DT" on the flat up by the tip/gas tube opening (also facing the lower when installed). Is this really a DPMS upper? (or just DPMS compatible?)