Buffer Spring and Recoil

[LRRPF52]

Lrrp,

Thank you for the reply. The thermal is rated to .375 so it should handle the recoil. With the JP silent Capture spring setup the recoil was sorta jerky and I suspect that uneven recoil was causing the bad pixels.

If I understand your reply correctly, you run the spring and buffer that came with the Larue Ultimate Upper? The way I read your post you would not try to improve on the setup that comes with the Larue UU kit. Am I correct?

I have not tried the buffer and spring that came with the Larue UU kit and plan to try that this weekend. I was waiting on my Larue lower to arrive and have been just using the lowers from my .300 Blackout.

If someone describes optics being rated to a certain caliber or cartridge, it doesn't address the most challenging aspect of modern optics in semi-auto rifles, which is impact of the bolt and carrier upon the return stroke of the cycle (feeding, chambering).

An AR15 with excessive cyclic rate can be a lot harder on optics than any magnum bolt gun, because the bolt and carrier slam into the breech and extension with each firing other than last round.

Most optics are not designed for semi auto rifle actions, so they break. AR10s are especially brutal on optics because of the mass and velocity of the carrier slamming back home.

It's a deceptive practice to tell a customer that "this optic is rated for huge magnums" knowing that many people are mounting optics on modern rifles with self-loading actions.

This is one of the reasons you see low priced optics, versus expensive optics. There are additional processes in the mounting of critical components inside the optics to insulate them from bi-directional G forces or impulses on higher end optics, including thermals.

I was going to tinker with my LaRue until I shot it. It convinced me very quickly to just leave it alone due to how smooth it cycled. I haven't experienced an 18" MLGS 6.5 Grendel that runs that smoothly with a standard buffer and spring before.