I had most of the pieces of this build but was waiting for the Phantom and DPMS action block. I couldn't wait so I hacked the required clearance into my Brownells block, notpics of that since I did it with a 1/2 drill bit.
The final result:
A shot down broadway. It took about 4 test fits to get the barrel nut in postion for the rails to line up.
The LMT was not parked under the FSB nor was the FSB parked behind the hand guard cap. I just used a big ol sharpie to blacken the back of the FSB. Also on the barrel where the hand guard cap used to be, there is now gap since the cap is removed. The FSB pins on the LMT are straight pins and came out easily.
Overall, impressed with the quality of the LaRue. Somewhat dissapointed with the LMT not being parked under the FSB. Comparing my 2 LMT uppers with my CMMG upper, the fit and finish is pretty equal, with the slight nod going to CMMG. Both are very nice.
Thanks to The Tactical Solution for LMT upper and G&R Tactical for the LaRue.
Edit to add, sorry about the piss poor pics, no flash, batts were going dead!