that is a fantastic looking build.
Seeing things like this really tear me up, I love my state but the no cans is killing me.
Great looking build! USO makes some really nice glass!
Very nice rifle… that scope looks amazing.
Silly question; Why not just use one of LaRue’s SPR scope mounts? Looks like the SPR-E would work no? Unless they don’t offer the correct ring size for your scope…
LT at one point made a version of their SPR mount to accommodate larger turret areas. I guess they stopped making them?
The Knights 34mm scope mount would work.
Not QD though. However, for an SPR (for me) QD isn’t a requirement.
According to an email exchange back in November of '09 with Brian Fulton at LaRue, I inquired about the LT-104 to fit the SN-3 T-PAL when I was first speccing out the scope and he informed me it would not clear but that I could try the LT-111, but the LT-111 doesn’t offer a forward offset to get the scope far enough out though so I went with the 2-pc design of a riser+rings. If there was an SPR-style foward-offset mount with wider spacing for large turret block scopes, I missed out on it 
However the vertical ring clamps might obscure the elevation turret which wouldn’t help things. The EREK knob is very large in diameter, but it’s fairly low profile and easily shrouded by the ring.
The Knights P/N 24755 30mm unit is a very interesting one. It’s listed as 1.4" which I don’t think will clear my rear BUIS. I’m running about 1.470" right now and there is probably less than .070" of clearance.
Nightforce’s Unimount is also another option without the QD, but I can’t find any dimensions on the unit. I might have to email Nightforce and get some dimensions. I can live without the QD levers if I can stow a small boxwrench in the buttstock to remove the sight if it fails.
I am using these (http://www.americandefensemanufacturing.com/view/product/5/) on three of my long range AR’s and have been very happy with them. I prefer the clamping system to the Larue and they don’t wear out the bottom of the rail like the Larue or ARMS type caming device.
Until that day,
Darkop
Replacement LaRue mount came in today. Sending back the old one tomorrow so their engineers can 
at how I bent the thing. Thanks LaRue!
Might be more delays before I get to fire though. I’m trying to get the M40 scalloped knob for the windage which was my original request, but it couldn’t be done with the old rheo and I ended up with a #3 knob which is knurled instead. Since switching to a smaller diameter turret on the new digital rheo, we can use the M40 knob again but I have a windage stop. Waiting to see if I can just send in the old knob to get a new one machined and timed in, or if the whole scope needs to go back. I don’t want to start the process of zeroing if I have to take the entire bloody thing apart again and start over. I’ve waited this long, a little more won’t hurt 
I have a rather silly/n00bish question…
I just noticed you have some kind of bubble level mounted on the rifle, what’s it used for? I’ve never seen anything like that!
Side to side cant produces downrange errors, left or right depending on cant angle. The bubble is a visual cue that the rifle is level to the target in contrast to the terrain. Some say it’s voodoo, some say it’s not…
Nice build w/ good components.
USO’s are built like a tank.
enjoy !
You will be amazed at the improvement in the brightness of the glass if you take the ARD piece off. On one of my USO rigs it made almost a 20% difference by my estimation. Now I wont use it unless I absolutely need to. It made THAT much difference in my application.
I’ll have to pop off the ARD and give it a try. I don’t think I’ve pulled that thing off since I’ve gotten it.
The cant issue isn’t a big deal until your bullet starts dropping massively, 600m+ for the 5.56mm. Even an error of 1 degree isn’t much inside normal ranges. At least mathematically, at 600m, you’re dropping about 133" with a 77gr Mk262 load out of an SPRish rifle so if you’re 1 degree canted, it would be (133" x sine of 1 degree) about 2.3" of horizontal component if the erector axis is off the scope/bore axis.
Interesting, thanks.
Very nice build!
Cesiumsponge- I think USO was at one time designing a Posa-Slide mount to work with the TPAL. Did you contact USO?
At any rate there are a few solutions posted on the Hide (albeit an older thread).
EDIT- I just realized that most of the above options might be too low for your KAC BUIS.