Adjustable Gas Block of Any Benefit?

[Phil3]

Is there any benefit to using an adjustable gas block (JP Rifles) on an AR10 (or AR15). I am building an AR-10, and was not sure what type to get. Adjustable or non-adjustable? I will be shooting 308 but may move to another caliber later on. Barrel will be 22" to 24" if that makes any difference.

- Phil

 

[Outsydlooknin75]

Re: Adjustable Gas Block of Any Benefit?

3 gun shooters like em as an additional way to tune the gun. Use a low mass carrier, a brake, and adjust the gas to it just cycles the action will give you a faster follow up shot with minimal muzzle movement.

 

[tuckner]

Re: Adjustable Gas Block of Any Benefit?

An adjustable gas block is only advisable in "clean" range environments, correct? I would imagine they are finicky in the field and a dirty weapon would cease operating effectively.

Edited: As an afterthought you can always turn the gas back up if your getting dirty.

 

[AXEMAN]

Re: Adjustable Gas Block of Any Benefit?

i chose one over non when i built the lr308. i want a supressor eventually, i heard it woukd be better.

 

[FromMyColdDeadHand]

Re: Adjustable Gas Block of Any Benefit?

I think the main issue is that the main adustable GB I've seen is the JP and it is adjustable, and then you are supposed to Locktite it in place. I guess it really is tunable, since once locktited it is no longer adjustable.

I wish someone would come out with a something besides the two step and big Noveske Switchblock.

I think the conventional wisdom is that the Adj GB are not appropriate for a defense or duty gun since the adjust screw could cause issues.

That adjustable gas and light operating system also can make for a faster running gun. I noticed it when I was taking pics of standard ARs versus JPs. That bolt is moving way faster in the JP then in the standard ARs- it seemed to cycle twice as fast. When taking a pic of standard AR, I would easily capture the ejecting brass near the rifle, I struggled to get the brass in the picture frame with the JP.

 

[KClark]

Re: Adjustable Gas Block of Any Benefit?

I've owned and used two brands of adj. gas blocks and a gunsmith built version on three different barrels fitted by three different gunsmiths. They all functioned exactly the same. With adjustment screw turned all the way in (closed) the rifle operated as normal. Bolt cycled fully to the rear and stayed open on an empty magazine. The only reason for this I can think of is the gas port was way too big to start with.

Barrels were:
26" Krieger 6mm gas system extended 2"
28" Blackstar (KP) .224 gas system extended 4"
22" SGW .224 rifle length gas system


Seems like a good idea but it never worked for me.