AR Over Gassed ?

[chasem5657]

I was shooting my New PMSA Upper today Chambered in .556 on a POF Multi Lower and noticed it is over gassed. The Brass was shooting out around my 1:00 - 2:00 (Angle) when im told that a normal AR shoot's brass out around 3:00 to 4:30 (Angle) This is my first AR build any suggestions how to fix the problem ?

[russ69]

If it runs, it's good.

[GUNNTZ]

I agree, if it runs leave it alone. Keep in mind not all ammo is created equally, some hotter and some weaker; so this could be creating your concern. But if you got a real stiffy to do something, a heavier buffer is the cheapest and easiest.

[StuckInTheP.R.O.Ca]

Heavier buffer, OP. One of my builds is still overgassed even after putting a H3 buffer in it. I'm going to replace the buffer spring next as it has noticeably less tension than my other springs. What's weird is the barrel has a mid length gas system so I wasn't expecting this.

[Truck286]

JP Adjustable Gas Block.. Lets you dial in the Gas Port..
Next Question..

[Oceanbob]

JP Adjustable Gas Block.. Lets you dial in the Gas Port..
Next Question..

Exactly....This^^^^

Problem Solved.

Bob

[Jimi Jah]

JP gas block, I use several here. Lowers recoil too.

[RumT]

Its new

Its functioning

After 1000 rounds start fine tuning

[ScottsBad]

Its new

Its functioning

After 1000 rounds start fine tuning

A lot of rifles are over gassed. Is in a mid-length, carbine, of some other gas system length?

I ended up tuning all my ARs. While I think an adjustable gas block is an elegant solution I don't think it is the best solution for a hard use rifle (JMHO) because the adjustment system adds a small variable to the rifle.

The simplest solution is probably the best in this case. Changing the buffer is easy and has little consequence as long as you don't go too heavy. I am assuming you have a standard adjustable carbine buffer tube.

Open the action and look at the end of the buffer. If it has no mark it is a carbine buffer. If it has a H it is a Heavy also known as an H1 buffer.

Whatever it has; Start by buy buying the next heaviest buffer. If it is a carbine buffer, buy an H buffer. If it is an H, buy an H2.

The buffer spring also has a small part to play. Your rifle is new now, but in the future most buffer springs will begin to degrade. If you decide to put in a better quality spring I recommend Springco.com. They make better quality (longer lasting) springs. The WHITE spring is equivalent to the a better quality standard carbine spring, the BLUE spring provides a little more tension.

If you change the buffer, make sure that all of the ammo you use works properly. So if you put in an H or H2 be sure that the rifle cycles properly with the weakest and most powerful ammo you use.

Lastly, I run H2s with a BLUE Springco spring in most of my rifles, except two. One is a BCM mid-length LW profile where I'm running a WHITE spring and an H buffer. And the other is a Noveske barreled rifle with a Vltor V5 buffer system. The V5 is also a completely different system created by Vltor which extends the buffer tube and uses different springs and weights. This system is not necessary unless you are having serious problems with reliability, or you need the absolute best in reliability.

Start by simply buying the next heaviest buffer. If thats not enough get the next heaviest. Thats all I can think of right now.

[FeuerFrei]

Check for swipes on the bases of fired cases before claiming over gassed condition.
1'oclock ejection doesn't necessarily mean it's over gassed.

Sent using 2 cans and a long string.

[MarikinaMan]

Spinco makes 308 buffer spring, just sayin.

http://www.sprinco.com/tactical.html

[AceGirlsHusband]

Adjustable block OR a pig tail gas tube. I've done that before to solve that problem.

[Truck286]

Change ths.. Do that... Please..
Just get an Adjustable Gas Block and be done with it...
Changing out Springs and Buffers is a Temporary Fix...
Reason, If you are out and have a failure YOUR STUCK..
Because You may Not be able to Borrow from another Rifle or its Parts.....
Where if You have an Adjustable Gas Block It Will let YOU DIAL the Gasses To Accommodate Any Part Within the Gassing System.. Which in Turn Allows YOU Options...
But What Do I know I've only been Twisting and Build The AR Platform for 24 years..

[Jimi Jah]

My 20" doesn't really need one but the 16's sure do. My 7.5" pistol required it.

[Dezrat]

Check for swipes on the bases of fired cases before claiming over gassed condition.
1'oclock ejection doesn't necessarily mean it's over gassed.

Sent using 2 cans and a long string.

This /\/\/\
Along with no showing of case rim stress & operating reliably, it's good.
More than just Gas affects the "ejection angle". People make too much of it.