Adjustable gas blocks

[Schlyme]

I was looking into adjustable gas blocks for my future 300 blk build. For those of you who use them, does it matter who makes them? I'm looking at those available on the Midway website.

[FMJBT]

I think the Syrac adjustable block is one of the better options out there for adjustable blocks. Kind of pricey, but the detent for the set screw is a nice feature that lets you adjust it for different loads without having to use locktite to keep everything set.

Having said that, I'm not certain that a 300 Blk really needs an adjustable block. Typical barrels for the 300 use a very short gas system length in relation to barrel length to maximize dwell time for cycling the bolt. This would indicate that the 300 is a fairly low pressure round that most likely will not have issues with being over gassed.

[henmar77]

Go with the kies sold at Joe bobs. It's around 33 bucks and one of the best I have used. Put it on three different uppers.

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[TheExiled]

I have a JP, wont go back again

[bonesurf]

I dunno the adjustable gas block but I got a .300blk and it doesn't kick very hard at all. I messed around a little heavy buffers and a stiffer spring an found that I would get double and triple fires. So long story short I'm not sure I would mess with the gas system.

[starsnuffer]

The gas system must be in balance with the ammunition and action spring/buffer. The point of having an adjustable gas system is to aid in finding this balance.

Once a "working point" is found, the user can then tailor the gas system to suit his/her needs. If the ammo is very consistent, the user can create a very soft/slow gas system for increased shoot-ability at the cost of reliability. If the user wants a robust gun that can function in adverse environments and is still capable of firing with poor lubrication, the user can turn up the gas and increase the power of the action spring at the cost of shoot-ability.

It's just another tool in the toolbox.

-W

[FMJBT]

The gas system must be in balance with the ammunition and action spring/buffer. The point of having an adjustable gas system is to aid in finding this balance.

Once a "working point" is found, the user can then tailor the gas system to suit his/her needs. If the ammo is very consistent, the user can create a very soft/slow gas system for increased shoot-ability at the cost of reliability. If the user wants a robust gun that can function in adverse environments and is still capable of firing with poor lubrication, the user can turn up the gas and increase the power of the action spring at the cost of shoot-ability.

It's just another tool in the toolbox.

-W

I agree completely, I'm just not sure it's needed on a 300 BLK. For an adjustable block to be useful, an over-gassed condition must exist so that you can tune it down to the minimum level needed to run reliably. From what I've read, the 300 BLK needs a very short gas sytem length just to generate enough pressure/dwell time to reliably cycle. I don't think excessive gas pressure is going to be an issue with most 300 BLK builds.

[G38xOC]

Do you likely have to change the setting of the gas block , let's just say from carbine to rifle length buffer is changed?

[Schlyme]

The reason I ask is that cmmg had ammo recommendations for their carbine vs pistol gas port barrels. For the pistol system, they basicly said don't use supersonic ammo. For carbine, subsonic is well not ideal.

Thanks for all the info so far.

[FMJBT]

The reason I ask is that cmmg had ammo recommendations for their carbine vs pistol gas port barrels. For the pistol system, they basicly said don't use supersonic ammo. For carbine, subsonic is well not ideal.

Thanks for all the info so far.

Interesting. If you plan on using both, the Syrac would probably be a good option as you can adjust it back and forth for both without having to locktite the set screw. Another option would be the 3 position block from Paladin Machine. They custom make them per application. Typically they are used for suppressed rifles, with settings for suppressed, non-suppressed, and cutoff. I would think it could also work for supersonic, subsonic, and cutoff.

[L4D]

I've used the syrac, JP (A2) and kies.

The kies is the best option. It's not advertised but it does have a detent pin that clicks to keep the adjusting screw in place.

Syrac does too but the cost is double that of the kies.
It's funny the JP does not have this feature and it's supposedly touted as top of the line... Go figure.

[FMJBT]

I've used the syrac, JP (A2) and kies.

The kies is the best option. It's not advertised but it does have a detent pin that clicks to keep the adjusting screw in place.

Good to know. Thanks for the info.

[Arnelcheeze]

im running a JP low pro on my Maten build (LR308) runs great. i like to have the option of gas adjustment.

[wash]

I've used the syrac, JP (A2) and kies.

The kies is the best option. It's not advertised but it does have a detent pin that clicks to keep the adjusting screw in place.

Syrac does too but the cost is double that of the kies.
It's funny the JP does not have this feature and it's supposedly touted as top of the line... Go figure.

I just ordered a Syrac, the reason is that the adjustments are in the front so you can tune it without removing your free float tube or drilling holes in it.

Does the Kies adjust from the front or the side?

Thanks.

[L4D]

I just ordered a Syrac, the reason is that the adjustments are in the front so you can tune it without removing your free float tube or drilling holes in it.

Does the Kies adjust from the front or the side?

Thanks.

It adjusts from the side. I got lucky and it ended up dead center in one of the vent holes on my TRX Alpha rail.