adjustable gas block
- By TonyAngel
- Semi-Automatic Rifles
- 26 Replies
That's the rub. When setting up a rig for competition, you'll often setup the rifle to run as long as it needs to before cleaning, on as little reciprocating mass as possible so that you can run as little gas as possible and get less recoil. The downside to setting up a rifle like that is a sacrifice in flexibility.Of the three you listed, I've only used SLR. I think they're high quality and I like them for what they are but they definitely freeze up with carbon IME. And the only thing holding them on is two tiny little grub screws. So expect leaks.
As far as gassing the barrel "properly". It's only going to be gassed properly for one condition. Suppressed or unsuppressed. So, no fault to Ross but he can only do one or the other. If you do have a very low back pressure can I would definitely have it gassed for a brake and then just suck up the back pressure that a low back pressure suppressor will add. To me, the bigger evil is a poorly fitted adjustable gas block than a properly fitted non-adjustable gas block that doesn't choke down the extra gas. I think the standard two grub screw gas blocks are a liability and unnecessary weak point when you consider how much effort we're putting into other parts of the gun. If Ross could cut the journal to a slight thermal fit/ friction fit that would be ideal.
The lighter the reciprocating mass, the more sensitive the system will be to changes in gas volume. The heavier the reciprocating mass, the less sensitive it will be to changes in gas volume. When tuning more for reliability and flexibility, tuning to run an H2 or H3 buffer to get you the right closed bolt lock time is the way to go, but you will get more of a recoil impulse.