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Screaming Deals on Armalite Barrels

T
LRRPF52 said:
One thing I would change for the dimensional specs on an 11.5” heavy barrel would be using 5/8x24 threads vs 1/2x28. It’s a big step down in mass when you want the benefits of a heavy barrel that is heat-tolerant, that you are sacrificing extra weight in-favor of better grouping at reasonable distances.

A tight-fit muzzle device and suppressor will mitigate that a bit, but I still don’t like such a dramatic change in barrel profile with the step down to such a small threaded muzzle. It’s just begging to absorb a lot of the heat load and bell out. Chrome-lining and CMV steel help counter that, but any advantage would be good in that area.

For gassing, you can choke the flow of a large port back at the carrier with a Bootleg. Instead of going to heavier buffers, try extra power spring weight in the action spring. I use standard buffers and extra power springs more now, after feeling and seeing how well that manages the cyclic rate.
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The whole thing with the 1/2x28 threads on a heavy barrel has always been something that bothered me. I've heard the notion of mitigating this with a muzzle device. What also worries me is overtightening the muzzle device and I dont think I've ever found a definitive torque spec on muzzle devices. If it matters, I always time my muzzle devices with shims.

As for controlling gas, we'll have to agree to disagree regarding using springs to affect closed bolt lock time. Nevertheless, I do agree that controlling gas flow is the way to go. Although I'm trying to get away from using "controls", my chosen method thus far has been riflespeed gas blocks. I think they truly are the best thing going.
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