Which AR-10 has the least barrel deflection and is considered the best?
I feel like this topic is blown way out of proportion, yes not all uppers are created equally but at the same time you need to know your rifle.
Next time you're practicing at the range with a Bipod and rear bag, shoot from the Prone, Bench, Barricade and standing with tripod.
The 4 Rifles/Uppers that reduce the least POI shift the most are as follows...IMO
(1) LMT MWS and LaRue OBR.
The LaRue OBR is going to provide the best of both worlds with it's bullet proof design and true free floating barrel design.
With the LMT you won't be able to compete with it's rigidity from it's one peace Upper/Handguard but achieving Consistent all day Sub MOA is challenging, even with custom Bartlein barrels the LMT is just a finicky bitch.
(2) JP LRI-20 and Seekins SP10
The JP and SP10 are similar in design with their integral barrel nut design but both have area's to improve on.
The SP10 really needs Heli Coil inserts in the Upper receiver for the Handguard screws and the JP could benefit from a larger ejection port, bolth rifles would benefit from some alternative handguard designs.
(3) Another rifle that has excellent rigidity and accuracy is the LaRue PredatAR's. The accuracy that the PredatAR's have with a quality Cut rifled barrel are phenomenal.
With all the builds I've done over the years the most accurate rifles have been built off of LaRue OBR, PredatAR (Small and Large frame) and Seekins SP10 build kits.
I ALWAYS buy them just to have a few on hand for precision builds.
