Save weight and regulate recoil with your BCG ... Say What ?

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SharpDog

SharpDog

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Variety is the spice...

I suppose if ones rifle was over gassed, and flatly refuses an adjustable gas block, this would be a solution.

The vented gas would not be in front of the shooters face, blasting them with hot gas, unless they were a lefty.:(
 
I'm running 1 carbine now with a low mass bolt and adjustable gas block and it flat out works; cleaner, less felt recoil, puts brass in a neat little pile, easily adjusted to load. Complete with titanium gas block it set me back abut $370, so if this functions reliably $439 isn't that outlandish.

I think the adjustable gas block might still be a cleaner solution as it bleeds off before it ever gets to the bolt carrier, but I'v also got to periodically clean my gas block in addition to my bolt.
 
This just proves that the aftermarket for all things AR is healthy. That's only possible when the "installed base" for an item numbers in the millions. The gun-banners need to mull this over. These millions of AR's aren't going to disappear no matter what the legislation.
 
Demi-human said:
Variety is the spice...

I suppose if ones rifle was over gassed, and flatly refuses an adjustable gas block, this would be a solution.

The vented gas would not be in front of the shooters face, blasting them with hot gas, unless they were a lefty.:(
Click to expand...

Doesn’t look to me it changes the gas vent location in any way. It appears to be merely a throttling valve between the gas key and piston chamber.

It’s an interesting product, mechanically - if a guy closed that valve entirely, the ported gasses would impinge upon the gas key, converting it to a real DI force. I can appreciate force would be less efficient acting on the carrier via impingement upon the key, rather than acting on the carrier via the piston chamber, but it would still work to move the carrier to the rear.

So throttling on the carrier instead of the gas block is kind of like taking two steps forward and one step back.

The relative price is a huge drawback. $440 for a carrier is a massive upcharge, whereas a guy can spend a much smaller relative increase to get an AGB.
 
Regulating gas at the bolt instead of the gas block... Great idea, wonder how much it costs?
Click to expand...

Sun Devil Mfg will sell you an adjustable carrier key for like $60 that you can install on your carrier.
https://shop.sundevilsales.com/ADIG...as-System-223-308-Compatible-SD-ADIGS-KIT.htm

Easy to swap out and they work well, bit of a PITA to adjust as you have to keep splitting the upper from the lower and removing the carrier, but it typically only takes 4-6 shots if you don't mess up and turn the setscrew the wrong way :)

I've a DMPS and CMMG that were seriously overgassed, especially when suppressed. Pretty simple fix. I didn't want to remove my suppressor QD mounts to swap in an adjustable gas block (whcih could be a bit less expensive if you ignore your time and effort).

Doesn’t look to me it changes the gas vent location in any way. It appears to be merely a throttling valve between the gas key and piston chamber.
Click to expand...
Correct, less gas vents out the holes in the carrier when its adjusted to reduce the gas. Might get a bit of extra leakage around where the key mates with the tube, but I've never noticed it.
 
Last edited:
wally said:
Sun Devil Mfg will sell you an adjustable carrier key for like $60 that you can install on your carrier.
https://shop.sundevilsales.com/ADIG...as-System-223-308-Compatible-SD-ADIGS-KIT.htm

Easy to swap out and they work well, bit of a PITA to adjust as you have to keep splitting the upper from the lower and removing the carrier, but it typically only takes 4-6 shots if you don't mess up and turn the setscrew the wrong way :)

I've a DMPS and CMMG that were seriously overgassed, especially when suppressed. Pretty simple fix. I didn't want to remove my suppressor QD mounts to swap in an adjustable gas block (whcih could be a bit less expensive if you ignore your time and effort).

Correct, less gas vents out the holes in the carrier when its adjusted to reduce the gas. Might get a bit of extra leakage around where the key mates with the tube, but I've never noticed it.
Click to expand...

That’s pretty neat.
 
The RCA uses a pair of set screws the Sun Devil has a single "self locking" setscrew. I found the Sun Devil because I was searching for .308 adjustable carrier key and they clearly stated theirs worked for either. The RCA doesn't say, although I expect it would.

If you are in the market for one, the RCA is in stock at the moment, the Sun Devil is not.
 
Varminterror said:
Doesn’t look to me it changes the gas vent location in any way. It appears to be merely a throttling valve between the gas key and piston chamber.

It’s an interesting product, mechanically - if a guy closed that valve entirely, the ported gasses would impinge upon the gas key, converting it to a real DI force. I can appreciate force would be less efficient acting on the carrier via impingement upon the key, rather than acting on the carrier via the piston chamber, but it would still work to move the carrier to the rear.

So throttling on the carrier instead of the gas block is kind of like taking two steps forward and one step back.

The relative price is a huge drawback. $440 for a carrier is a massive upcharge, whereas a guy can spend a much smaller relative increase to get an AGB.
Click to expand...

You could also just buy a barrel (if building) or a rifle that is properly ported and gassed to begin with.

You get what you pay for in my opinion.
 
Coal Dragger said:
You could also just buy a barrel (if building) or a rifle that is properly ported and gassed to begin with.

You get what you pay for in my opinion.
Click to expand...

I honestly don't think that's the issue they're (or most with AGB) are trying to solve. It's the ability to lighten recoil, save some wear/tear and keep the action clean. When you combine an adjustable gas block, low-mass BCG and a decent compensator/brake the difference between it and a standard "gassed" AR is pretty remarkable when it comes to recoil and muzzle rise.
 
I have been using JP low mass carriers for years. With a properly tuned adj gas block, and a good comp, the recoil characteristics are much improved. It is not a setup that I would use for a duty rifle. That being said, my such equipped rifles are boringly reliable.

I favor adj gas blocks over the adj gas keys. Makes more sense to me to restrict the gas at that point.

People who shoot my rifles who are accustomed to a typical m4 clone, pause after the first shot and say, "How do you get it to shoot like that?"
 
Chuck R. said:
I honestly don't think that's the issue they're (or most with AGB) are trying to solve. It's the ability to lighten recoil, save some wear/tear and keep the action clean. When you combine an adjustable gas block, low-mass BCG and a decent compensator/brake the difference between it and a standard "gassed" AR is pretty remarkable when it comes to recoil and muzzle rise.
Click to expand...

Well said.
 
Chuck R. said:
I'm running 1 carbine now with a low mass bolt and adjustable gas block and it flat out works; cleaner, less felt recoil, puts brass in a neat little pile, easily adjusted to load. Complete with titanium gas block it set me back abut $370, so if this functions reliably $439 isn't that outlandish.

I think the adjustable gas block might still be a cleaner solution as it bleeds off before it ever gets to the bolt carrier, but I'v also got to periodically clean my gas block in addition to my bolt.
Click to expand...

This is a key point - a gas block that requires cleaning renders the rifle not easily field serviceable.
 
Coal Dragger said:
You could also just buy a barrel (if building) or a rifle that is properly ported and gassed to begin with.

You get what you pay for in my opinion.
Click to expand...

What port diameter should I use for my next rifle barrel? The one it is replacing runs about half of the time with a 50 Vmax and half of the time with a 77 smk, and half of the time with a brake, the other half with a SiCo Omega. Oh, and I just got an OSS out of jail...
 
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