QD vs Standard mount for precision AR optic

[Flight medic]

Mounting a Vortex Razor 4.5-27x56 on my new precision AR build. Originally wanted to go with the Bobro 34mm Dual Lever Precision, but I'm concerned that the QD mechanism can be effected (affected?...always confused by those) over time by recoil and no longer hold zero after reading about a gentleman that had two different mounts suffer from "spring lug shrinkage" which allowed the mount to slide back and forth on the upper. Apparently Bobro doesn't use a machined-in recoil lug. If the lug doesn't shrink, the mount will hold with within .001 or so. However, if the lug shrinks just .006, it will go from holding zero to chasing zero, and the amount of zero shift will then depend on how straight the upper is machined.

I dont need or necessarily want a QD...I just wanted to save $100 withut compromising performance/reliability. My other choice was the Geissele 34mm Super Precision Hyper-Extended mount...but it will run me $100 more than the Bobro and I wasn't sure it was worth the added expense. Vortex's offering in 34mm was the least expensive, but they don't list a 20 MOA option.

Thoughts?
Alternative suggestions?

I need a 20 MOA cantilever model that will put the scope forward enough for eye relief. I cant use straight rings as my handguard will have no rail, so whatever I get must mount to the receiver and offset forward.

Also, is there an ideal ring height for a 56mm objective? I will be using a Lancer LCR5 round carbon fiber forend with a 2.0" outer diameter...if that makes a difference.

Any advice greatly appreciated.

 

[Klong]

The Geissele is worth it. No worry about any movement or failure over time. I would use the tallest mount to cover the 56mm scope.
What caliber are you shooting? I have 2 Geissele mounts on my AR's.

 

[bluestreakrem]

I'm a big fan of one piece mounts due to their rigidity and inherent alignment between the rings. I can't stand the thought of binding a high dollar scope tube even just a little. That can happen even with the best individual rings. Unfortunatley a one piece QD mount won't work for every application. But if I can get one with the correct elevation for the rifle and if it will mount to the rail space available, it will be a one piece mount for me. I like the QD type so I can remove the scope for cleaning, transport or if I want to swap optics between rifles for a particular situation or hunt. QD mounts from American Defense and LaRue have worked great for me and repeat POI. I'm sure the SPUHR mount is awesom but I don't want to drop the cash on it since the cheaper mounts have proven good for me.

If your mount has the ability to adjust for clamping force (which the above mounts do) you should never have a problem with "spring lug shrinkage'.
The LaRue mount has two specific recoil lugs that bare against the Pic rail slots.
The American Defense mount does not have specific lugs. The mounts clamping bolts bare against the Pic rail slots.