I'm scraping up parts to round out an upper build (may eventually grow a lower, we'll see). Using a 14.5" Colt SOCOM barrel, BCM upper (had good luck with these and the slightly tighter bore), Larue LAT 11" handguard, Leupold Mk4 3.5-10 M3 Mildot scope in a Larue LT-158 VFZ (non-QD) mount (1.44" height with 10 MOA).
I know Geissele and others are much more modern and tend to be preferred. At the same time, Larue has a lot of runtime in theatre and frankly I was able to buy the Larue handguard + mount brand new for less than I was going to pay for a used Geissele mount.
I guess I'm just looking for a little validation and/or sharing of experience from those with experience with these things. As much as I've done with AR's, honestly most of it has been Geissele, BCM, DD, and Noveske-centric. I have a Larue mount on my T-1, I like it and have had several (LT660). I've also had a few Larue QD mounts on other optics (mostly 1-4's) and under ACOGs with good success.
Overall the upper will be setup with an AAC SPR/M4 reflex can as a hunting upper with a bent towards a short SPR-ish thing. In the future I'd like to add an RMR piggybacked at 12:00 to the Leupold (I've tried offset and piggyback and strongly prefer to keep the MRDS on the centerline). Was looking at the Trijicon mount for that as it seems to be a little lower than the Larue ring version.
Thanks for any feedback.