Overgassed?

[judgedelta]

Would someone who knows, please explain the symptoms of a gas gun being overgassed? I read someone on here while ago complaining that his .308 Bushie was overgassed because it was throwing brass at 1 o'clock about 2 feet away. I thought my MWS might be overgassed because it is throwing brass at 4 or 5 o'clock about 10 feet away (remembering that it has 2 ejectors on the bolt face). What is the true clue to overgasification?

Thanks...

 

[problemchild]

Re: Overgassed?

Forward is overgassed rearwards is normal (most of the time).

Check to make sure you do NOT have brass marks on the front of the ejection port (indicating port bounce)

You are fine!

 

[Fried Chicken Blowout]

Re: Overgassed?

I just had the opportunity to see the difference. I knew what to expect but it's nice to see it actually happen. I have two identical ARs now for games. Built the first one for 3-Gun and liked it so much I did another for long range team field matches where I'm the carbine shooter with a bolt gun partner. Vltor upper, 16" mid-length match barrel and an AAC brake on the 3-Gun upper but I didn't do an adjustable gas block... Big mistake. After installing my new Mini-4 suppressor, it was clear the gun was over gasses. Lots of gas back in my face and the ejection pattern was about 8 feet to the 1 o'clock position. I even had some malfunctions with the bolt over riding the next round in the mag because is was returning to battery so fast the mag couldn't keep up.

Knowing that my other Form 4 for an AAC Ranger 2 was almost due, I decided to build another AR just like the first for the field matches. The plan was to keep the Ranger 2 mated to this rifle all the time since I didn't have to deal with the 3-Gun rules that would put me in open for using a suppressor I don't need to be able to shoot the gun without the suppressor on. So I installed a Syrac gas block on the new upper. While breaking in the barrel I adjust the gas block down to where the action would no longer run with the suppressor off, then installed the suppressor. The gun would then run again so I adjusted it down some more. Turned out there was only about half a turn left in the gas block before it bottomed out. Even totally turned down there's enough gas getting through the port that the gun runs flawless with the suppressor installed.

The gun is noticeably quieter to an observer, I don't notice it shooting. But I do notice the lack of gas in my face, less recoil as well as the change in ejection pattern. The cases eject 4 feet to the 5 o'clock. Lesson learned, for any gamer AR i build in the future I'll be installing an adjustable gas block. Not sure I'd do it for a gun that I would grab in the middle of the night just because it's one more thing to have an issue with but it makes the gun much more flexible and nicer to shoot since you can tune the gun for your specific ammo.

A little off your specific question but thought I would share the learning experience. Adjustable gas blocks are worth the little extra money.

 

[judgedelta]

Re: Overgassed?

From what I understand, brass marks are standard on the deflector lump on a MWS. I and a lot of others use a piece of Velcro to save dents on the cases. Thanks guys for the info.

 

[problemchild]

Re: Overgassed?

Please RE-read what I typed about brass marks as you clearly did NOT understand what I said.

---> FRONT OF EJECTION PORT<----- NOT BRASS BUMPER!!!


<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: judgedelta</div><div class="ubbcode-body">From what I understand, brass marks are standard on the deflector lump on a MWS. I and a lot of others use a piece of Velcro to save dents on the cases. Thanks guys for the info. </div></div>

 

[wilecoyote]

Re: Overgassed?

the direction of the throw is related to the mechanical engineering and/or the conditions of the ejection system_ you have a overg.when the brass is throwed too much far & fast,respecting to the constructor's tech. spec. of a determinate s/auto rifle,independently from the direction of the throw_

 

[Ballista One]

Re: Overgassed?

"Overgassed" is a relative term. Analyzing ejections patterns is pointless given that it will change with different ammunition or the use of a suppressor.

 

[JonnyHawes]

Re: Overgassed?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: problemchild</div><div class="ubbcode-body">Forward is overgassed rearwards is normal (most of the time).

Check to make sure you do NOT have brass marks on the front of the ejection port (indicating port bounce)

You are fine! </div></div>

Sorry to steal your thread OP, but My AR has been throwing brass forward for a long time now. I sent it to S&W for repair, and they sent it back and said it was fine. My rear of my ejection port has been beat to death, the brass never touches the deflector to throw it backwards.

Any suggestions on a remedy?

 

[Ballista One]

Re: Overgassed?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: JonnyHawes</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: problemchild</div><div class="ubbcode-body">Forward is overgassed rearwards is normal (most of the time).

Check to make sure you do NOT have brass marks on the front of the ejection port (indicating port bounce)

You are fine! </div></div>

Sorry to steal your thread OP, but My AR has been throwing brass forward for a long time now. I sent it to S&W for repair, and they sent it back and said it was fine. My rear of my ejection port has been beat to death, the brass never touches the deflector to throw it backwards.

Any suggestions on a remedy? </div></div>

Brass striking the deflector or rear part of the ejection port is what causes it to eject forward. There is nothing wrong with your rifle.

 

[BobD]

Re: Overgassed?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: JonnyHawes</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: problemchild</div><div class="ubbcode-body">Forward is overgassed rearwards is normal (most of the time).

Check to make sure you do NOT have brass marks on the front of the ejection port (indicating port bounce)

You are fine! </div></div>

Sorry to steal your thread OP, but My AR has been throwing brass forward for a long time now. I sent it to S&W for repair, and they sent it back and said it was fine. My rear of my ejection port has been beat to death, the brass never touches the deflector to throw it backwards.

Any suggestions on a remedy? </div></div>

If you're having feeding issues from the bolt moving too fast You can use a heavier buffer to slow the process down, there are a number of different weights to choose from.

If you're having ejecting issues you could consider increasing the weight of you BCG or replacing it with something heavier if bothers you that much.

Just a note...Its my understanding that Magpul's BAD lever can sometimes stir issues when combined with higher gassed systems.

Bolt to fast = heavier buffer, or increase weight of BCG
Bolt to slow = lighter weight buffer, or decrease weight of BCG

Good luck man