Is gas an issue on 300 Blackout AR's like 5.56?

[Leshaire]

I might want to build a 300blackout to run my 30 cal can on. I know this probably sounds dumb, but does this round when suppressed typically have over gassed issues like shit in your face and carrier velocities that could be harmful to the gun?

It doesn't seem like nearly as many people are running as much adjustable gas type crap on these guns, like you see on 556 ARs.

TL;DR
My plan is to build a 7.5 - 9 inch suppressed AR in 300 blackout and run mostly subsonic ammo but would like to be able to shoot supersonic ammo as well. Should I look into controlling gas or nah?

 

[SouthernSlammed]

Sub'd!

I'm curious if you run the same lower for 300blk & 556, will 300blk operate well with the heavier buffer needed for suppressed 556!

 

[Mac11FA]

I do not have an SBR however I think that it will not be an issue as you will be running lower chamber pressures with subsonic rounds. Make sure you go with a length that will stabilize projectile as well as an adjustable gas block in case you have cycling issues.

Since bolt is same as 5.56 another thing to consider is an M16 bolt (full auto) as the added weight will help with lock time.

Of course as I initially stated, I have not built an SBR. I do have a standard length 300 blkout and have no gas issues when suppressing subsonic rounds.

 

[shootin4fun]

@Leshaire let's test mine at the range. I have a 8.5" 300BO that I want to see how it does suppressed.

 

[permaneo vox]

Sub'd!

I'm curious if you run the same lower for 300blk & 556, will 300blk operate well with the heavier buffer needed for suppressed 556!

Yes, same lower & mags(except the D-60). I run a Kaw Valley powdered tungsten(H2) with super sonic 300. Still has a sharp recoil impulse.

 

[Rwjeter]

Sub'd for a 300BLK pistol build!

 

[Leshaire]

I do not have an SBR however I think that it will not be an issue as you will be running lower chamber pressures with subsonic rounds. Make sure you go with a length that will stabilize projectile as well as an adjustable gas block in case you have cycling issues.

Since bolt is same as 5.56 another thing to consider is an M16 bolt (full auto) as the added weight will help with lock time.

Of course as I initially stated, I have not built an SBR. I do have a standard length 300 blkout and have no gas issues when suppressing subsonic rounds.

Do you have problems suppressing supersonic rounds? Increased carrier velocity and gas coming out towards your face?

 

[Leshaire]

@Leshaire let's test mine at the range. I have a 8.5" 300BO that I want to see how it does suppressed.

Nice! Id love to mess around with supers and subs and canned and not.

 

[Rwjeter]

Nice! Id love to mess around with supers and subs and canned and not.

@Leshaire let's test mine at the range. I have a 8.5" 300BO that I want to see how it does suppressed.

Sounds like a research project! In for the report or help with the research!

 

[Leshaire]

Sounds like a research project! In for the report or help with the research!

Haha im googling now. Have been for a few days but still. I dont think Im gonna get by as easy as on my 556. That gas port on that barrel is effing perfect! Surprisingly runs all ammo suppressed and not so far. Im not gonna be as lucky with 300 though since I wanna run subs and supers I think.

 

[Mac11FA]

Do you have problems suppressing supersonic rounds? Increased carrier velocity and gas coming out towards your face?

Unfortunately I cannot shoot supers at this time. I am awaiting my Sandman Ti for that. I will definitely test once I get it!

 

[Leshaire]

Unfortunately I cannot shoot supers at this time. I am awaiting my Sandman Ti for that. I will definitely test once I get it!

All good!

Im leaning towards the Gemtech adjustable bolt/carrier maybe since I really dont want to have to stress to get under the rail to the gas block thats 4 million effing degrees if I decide to change ammo. Or that WAR upper. Idk. Either is better than an adj gas block imo

 

[Mac11FA]

All good!

Im leaning towards the Gemtech adjustable bolt/carrier maybe since I really dont want to have to stress to get under the rail to the gas block thats 4 million effing degrees if I decide to change ammo. Or that WAR upper. Idk. Either is better than an adj gas block imo

I would go with WAR upper.

 

[Leshaire]

I would go with WAR upper.

Why is that? I looked pretty hard for actual real reviews the other day and couldnt find more than unboxing bullshit and like "Its so great ive shot it once!" type reviews. Im wondering how they hold up over time. If im gonna drop 250 on a stripped upper I want to make sure its worth a damn lol.

 

[Rwjeter]

I would go with WAR upper.

@Leshaire this is what I was about to say. It would be the easiest to adjust quickly between loads.

 

[Mac11FA]

Why is that? I looked pretty hard for actual real reviews the other day and couldnt find more than unboxing bullshit and like "Its so great ive shot it once!" type reviews. Im wondering how they hold up over time. If im gonna drop 250 on a stripped upper I want to make sure its worth a damn lol.

@Red Dawn has one on one of his builds. I cannot remember which, but he loves it!

 

[Mac11FA]

https://www.ar15.com/forums/t_3_118...s_WAR_adjustable_upper_review__Pics_too_.html

 

[Leshaire]

https://www.ar15.com/forums/t_3_118...s_WAR_adjustable_upper_review__Pics_too_.html

See this is another "I shot it once" type deals.

 

[Leshaire]

@Red Dawn has one on one of his builds. I cannot remember which, but he loves it!

Calling red dawnnnnn

 

[Rwjeter]

Calling red dawnnnnn

Start speaking Russian. He'll come screaming naked from the woods brandishing an AK while hollering "Wolverines!"