Adjustable gas....key--2A Armament Regulated Bolt Carrier

[muddywings]

I'm intrigued by this:

https://youtu.be/fTobcE4XwgY
Now my little pea brain can understand an adjustable gas block-turn down the amount of gas that goes down the tube that hits the gas key on the BCG, the less force there is to push the BCG. Logical.
What I don't understand is how regulating the gas after the gas key will slow it down in a similar fashion. Obviously I'm missing some understanding of how the gas interacts with the BCG.
Shinny new things fascinate me. Probably a bit pricey for me but curious about other people's thoughts.
I have also seen this on a BCG by Gemtech but it just has two positions-suppressed and suppressed.

Thanks for any insight.

ETA: Sorry I have obviously lost the ability to embed. Follow the linky to youtube.

[Irving]

https://www.youtube.com/watch?v=fTobcE4XwgY&feature=youtu.be

[muddywings]

show-off.....thanks

[ray1970]

I suppose regulating it there isn't much different than at the gas block as far as function. Either way limits the amount of gas hitting the chamber behind the bolt.

I think if you had a handguard that made accessing the adjuster on the gas block difficult this might be a viable option.

[muddywings]

I suppose regulating it there isn't much different than at the gas block as far as function. Either way limits the amount of gas hitting the chamber behind the bolt.

I think if you had a handguard that made accessing the adjuster on the gas block difficult this might be a viable option.

I guess this is what I don't understand

yes

[SAnd]

The AR15 is NOT direct impingement. It is a piston / cylinder. The bolt is the piston and the bolt carrier is the cylinder. The gas from the barrel goes down the tube through the gas key to the cylinder / piston chamber. The gas pressure then expands in the cylinder pushing the bolt and bolt carrier apart. The end result is the bolt carrier gets pushed back hard enough operate the system. By regulating the gas that gets to bolt / cylinder chamber it regulates the force available to push operate the action.

This is long version of what Ray 1970 said.

[muddywings]

Ok gotcha. PFM....pure freaking magic

Thanks


Sent from my iPhone using Tapatalk

[ray1970]

This is long version of what Ray 1970 said.

And much better explained by you. Sometimes the right words elude me.

[BPTactical]

And yet another thing to get the unsuspecting or gadget whore part with more of their cash.

A fix for a non existent problem.

[Danimal]

Deleted

[muddywings]

thanks for the education!

[Great-Kazoo]

I'm leery of something that has the potential (though rare) of coming loose and doing a job on the upper , possibly the lower.

[BPTactical]

^^^What he said.
Parts left off cost nothing, parts left off cannot fail.

[ray1970]

However, when in battery the bolt does not move forward when the chamber in the bolt carrier is pressurized.
It can only go one direction, the path of least resistance which in this case is rearward.

Dumb it down for us peasants.

The gas launches the carrier backwards. As the carrier goes rearward, it works the cam pin which turns the bolt to unlock it from the lugs in the barrel extension and allows it to travel rearward with the carrier.

[MarkCO]

And yet another thing to get the unsuspecting or gadget whore part with more of their cash.

A fix for a non existent problem.

Yes. Don't fall for it. There are a bunch of companies out there trying all sorts of things, some even called "game changers" that are not only poorly conceived and designed, but some which impair the operation.

[BPTactical]

Dumb it down for us peasants.


Pull trigger, stick go boom.

I edited the post you quoted because after going through the thread again there were plenty of dissertations on the result of the gas impulse on the bolt/carrier combination.

Eugene Stoner knew what he was doing, he designed a reliable operating system with a minimum of mechanical interfaces. What had traditionally been accomplished by the gas impulse acting upon a mechanical system such as a piston, operating rod, linkage etc (Garand, FAL, MAS, SKS and the like) Stoner eliminated. He "dumbed it down" pretty intelligently. He eliminated many points of mechanical failure.


About the only benefit I can legitimately see from an adjustable gas system is for a weapon that is severely over gassed. I would be more concerned as to why the weapon is over gassed in the first place. Out of spec components, poor mix of components etc.

[ray1970]

I bought a crappy barrel from Model 1 Sales back in the mid 90's. I was young and dumb and didn't know better back then. Turns out the gas port was way too big and the rifle was having cycling issues because of it. I ended up just buying a new barrel from a reputable manufacturer. Problem solved.

About the only real reason I could ever see myself running an adjustable gas system is if I were running a suppressor. Then it might be a nice feature to have.

[BPTactical]

Here is what you can get with the "Model 1 sale of the week":62259

Yes, that is two gas ports in that barrel. Neither was indexed correctly relative to the pin on the extension either.

[ray1970]

Here is what you can get with the "Model 1 sale of the week":62259

Yes, that is two gas ports in that barrel. Neither was indexed correctly relative to the pin on the extension either.

Now that's funny. I guess I was lucky mine only had one hole. Like I said, I was young and not as wise back then. Oh, and my budget was quite a bit tighter back then.

[Danimal]

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[Danimal]

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