I installed an Adjustable Gas Block on my 3 Gun AR......what a difference. The STI upper was way over gassed.....much like most of the other AR's I have ever shot. What gives.....why not make these standard on AR rifles?
Adjustable AR Gas Blocks.....Why aren't they Standard Kit
- Thread starter 7.62mm
- Start date
The AR is a service rifle. Reliability and simplicity are important. Delicate and tempermental gas systems are not necessary nor a benefit.
Tdc
Bolivar
CGN Ultra frequent flyer
Agreed, I'd much rather run an over gassed system that can't become "un-tuned". I've had a couple of gas block issues as it is. One was mis-alighned by me, the other the set screws backed off and the block slipped. Turned my AR into a single shot during a Championship match. That sucked balls.
What brand was it?
I'm guessing you threw that STI upper on some other form of lower ?
Usually when you buy a complete AR it come tuned. Chances are there are other ways to make that big difference that doesn't use the gas block, like buffer weight.
But as mentioned, they can be temperamental. They can loose their adjustment, you have to check them all the time. Change loads, you guns stop running right and need re adjustment. They usually require locktite or staking so they don't loose their adjustment to quickly. I staked mine.
And typically, the application you'd use one for is to set up a low mass system, using a light buffer and sometimes BCG then gassing down to accommodate it.
Makes for smoother operation.
My Adjustable upper is no where near as reliable as my straight gassed uppers.
Usually when you buy a complete AR it come tuned. Chances are there are other ways to make that big difference that doesn't use the gas block, like buffer weight.
But as mentioned, they can be temperamental. They can loose their adjustment, you have to check them all the time. Change loads, you guns stop running right and need re adjustment. They usually require locktite or staking so they don't loose their adjustment to quickly. I staked mine.
And typically, the application you'd use one for is to set up a low mass system, using a light buffer and sometimes BCG then gassing down to accommodate it.
Makes for smoother operation.
My Adjustable upper is no where near as reliable as my straight gassed uppers.
That's not uncommon with a fresh build. Has it stopped leaking.
I've found with any of my new builds I'll get leakage, especially where the gas tube mates, but carbon buildup will eventually seal it up.
There is def some leakage around the adj screw on mine, and because if get adjusted it never fully seals up. If you think about it, I can't see how it would be possible for it not to leak unless I permanently sealed the adj screw somehow.
So you bought a complete rifle off the shelf and didn't change anything ?
Out of curiosity, what is the barrel length and gas system length ?
16.1" barrel, and mid.....I have added an ergo stock, from the a2 stock, but the gun jumped around the same with both of those stocks, as well as with the cheapo adjustable stock I had on at one time
We have a few .750" adjustable gas blocks in stock
http://ctcsupplies.ca/products/syrac-ordnance-750-adjustable-low-pro-gas-block
http://ctcsupplies.ca/products/syrac-ordnance-750-adjustable-low-pro-gas-block
Hmm, 16" Carbines are bad for overgassing, but a mid should be smooth.
Mind you, an A2 stock will have a 5oz buffer, and an Ergo would be a carbine stock, which are 3oz by default. That can explain over gassed timing issues.
But you say it was the same with the A2 ? Do you have an H2 buffer right now ?
I'm running an HSS 6oz buffer in my straight gassed systems.
How were you judging it to be over gassed ? Just the feel, or the ejection pattern?
I've found that even a well tuned, perfectly gassed AR (specifically carbine) can still have a bit of snap to it, it's the nature of the short stroke action of the DI system.
Adj' gas block def smooth that out. My adj' upper is like butter. Piston conversions also smooth things out by changing the cycle characteristics.
When I have my 11.5" set up in DI, it's tuning is perfect but it's def' snappier then when I run it with my Piston Conv'. Smoothest shooting carbine I've met to date in piston. Still on the fence which way I like better.
Mind you, an A2 stock will have a 5oz buffer, and an Ergo would be a carbine stock, which are 3oz by default. That can explain over gassed timing issues.
But you say it was the same with the A2 ? Do you have an H2 buffer right now ?
I'm running an HSS 6oz buffer in my straight gassed systems.
How were you judging it to be over gassed ? Just the feel, or the ejection pattern?
I've found that even a well tuned, perfectly gassed AR (specifically carbine) can still have a bit of snap to it, it's the nature of the short stroke action of the DI system.
Adj' gas block def smooth that out. My adj' upper is like butter. Piston conversions also smooth things out by changing the cycle characteristics.
When I have my 11.5" set up in DI, it's tuning is perfect but it's def' snappier then when I run it with my Piston Conv'. Smoothest shooting carbine I've met to date in piston. Still on the fence which way I like better.
P0WERWAGON
CGN Ultra frequent flyer
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wouldn't it make more sense to build the gun with the correct parts the first time , rather than have to tune it? not like we have varying gas pressures from taking on or off the suppressor.
set the gun up right the first time and you dont need that crutch.
set the gun up right the first time and you dont need that crutch.
