Gaspains DIY AR15 Exhaust (update: made one pg1)

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[ARCHIVED THREAD] - Gaspains DIY AR15 Exhaust (update: made one pg1)

Posted: 1/22/2009 9:46:46 PM EDT

Here is an idea that I have had for several years, I just never took the time to actually do it. So I figure I would share it with you all. Its simple enough, i'm surprised no one else has thought of it...well maybe they have but I missed it.

As some of you are aware that excess gas can make it to your nose or eyes causing tears or can make your cigar taste funny because you have been busy breathing burnt gun powder. To solve this problem that Eugene Stoner overlooked when designing the AR15, you can buy a PRI Gasbuster which is reportedly effective at mitigating the gas, these cost about $80.

On paper this looks like it would work well. Anyone want to give it a try? I dont do much shooting anymore, so I wouldn't be able to do a range report for some time. Considerations, dont make the hole to large or you will weaken it.

Its pretty self explanatory..

*modifications should be done by a competent gunsmith

*I'm not responsible for any damage to property or limb that this modification or process causes

*If you want to sell it...ya gotta ask me permission first. I will defend.

Posted: 1/22/2009 9:50:55 PM EDT

[#1]

I have an extra second tier CH. I'll give it a go. Range report won't be until Feb though.

Since I use irons I figure that I can just become a lefty if something goes wrong

Posted: 1/22/2009 10:00:30 PM EDT

[#2]

That's an interesting approach.

Personally I've really never had a problem with this "gas in the face" issue, with any M16A2 or AR I've ever used.

Posted: 1/22/2009 10:02:16 PM EDT

[#3]

I think you've come up with a good idea there.

Posted: 1/22/2009 10:15:54 PM EDT

[#4]

That's basically how the Gas Buster works, but with a couple of shallow vent channels instead of a hole (probably for strength). I did actually modify one of my spare GI charging handles to replicate the GasBuster channels, and added high-temperature RTV sealant too, both aimed at eliminating the spit back from my Ciener .22 kit... the modified charging handle works very well, but I'm not sure how much of a contribution comes from the vents as opposed to the RTV sealant.

For my serious guns, I prefer to spend the $$$ and get a real GasBuster. As well as greatly reducing the gas-in-face issue, it also seems like a much more stout design than the GI charging handle. I've had a GI charging handle break, so I am wary of them now.

Here are some photos of the CH I modified, along side an original GasBuster:

Posted: 1/22/2009 10:21:59 PM EDT

[#5]

nice work StealthyBlagga

one problem I can see though, is that you cut though a lot of anodizing, which may or may not weaken the part. I dunno.

Posted: 1/23/2009 2:50:43 AM EDT

[#6]

Only had that gas issue with my 6.8 and that was once.

Posted: 1/23/2009 2:58:54 AM EDT

[#7]

That red RTV trick works like a champ. Here are the instructions I used to do it if anybody is interested. Its really easy and cheap as well, plus you don't have to drill anything.
'
http://www.coloradoshooting.org/gas%20buster.htm

Posted: 1/23/2009 4:16:20 AM EDT

[#8]

NICE IDEA GASPAIN!!!!!

Ill try drilling one this weekend for kicks!

Posted: 1/23/2009 4:33:43 AM EDT

[#9]

my daddy once told me.
if you dont like the smell of gas, dont fart.

Posted: 1/23/2009 4:52:25 AM EDT

[#10]

when you do put RTV on there, get BLACK. they sell it.

once it's on there don't lock the charge handle in, leave it out 1mm or so.
this will make it a tight fit once it has dried.

Posted: 1/23/2009 5:36:51 AM EDT

[#11]

I use high temp RTV when I build N.M. M1As and Garands. It is good quality material.

This does give me an idea though, try Devcon Steel Putty instead of RTV. Put mold release where you do not want the putty to stick. I may give this a try.

Posted: 1/24/2009 4:14:33 PM EDT

[#12]

Quoted:
nice work StealthyBlagga

one problem I can see though, is that you cut though a lot of anodizing, which may or may not weaken the part. I dunno.

I don't know if the CH is weakened; the cuts are curved and pretty shallow. The anodizing does not do much to strengthen the aluminum, though it does provide a harder surface (not really needed, as these are not abrasion points). Aluminum does not corrode as the thin film of trasnsparent oxide stops further corrosion. In any case, I only use this CH for my .22 kit... I use a GasBuster when I go to 5.56.

Quoted:
when you do put RTV on there, get BLACK. they sell it.

once it's on there don't lock the charge handle in, leave it out 1mm or so.
this will make it a tight fit once it has dried.

I used the red RTV as its a high temperature variant available for cheap at WalMart (their black stuff is not high temp). Maybe the high temp is not needed, but it does no harm. In any case, I don't much care what the color is as I only use it on my .22 upper.

Posted: 1/24/2009 4:32:12 PM EDT

[#13]

Thanks
Alot
Gaspain

Posted: 1/24/2009 6:46:09 PM EDT

[#14]

good stuff

Posted: 1/25/2009 7:09:22 AM EDT

[#15]

Quoted:

I used the red RTV as its a high temperature variant available for cheap at WalMart (their black stuff is not high temp). Maybe the high temp is not needed, but it does no harm. In any case, I don't much care what the color is as I only use it on my .22 upper.

I checked Permatex's site and the red is good to 650*F and the black to 500*F.

http://www.permatex.com/products/Automotive/automotive_gasketing/gasket_makers.htm

Posted: 1/25/2009 7:32:26 AM EDT

[#16]

What, the black ink from a sharpie won't stick to that red sealant?

This does give me some ideas though as I'm a leftie and the Gas Buster C.H. doesn't do me a damn bit of good. I've got an extra forged C.H. and I've got a mini-mill in my garage. I just might make a southpaw version of a Gas Buster out of one.

Posted: 1/25/2009 8:11:29 AM EDT

[#17]

This would be useful for shooting suppressed which is hte onyl time that I have had issue with gas in the face.

Posted: 2/7/2009 4:36:55 PM EDT

[#18]

anybody try this out yet?

Posted: 2/7/2009 5:11:07 PM EDT

[#19]

I'm going to take one of my Charging handles and chuck it up on an end mill and have a go at it.

Posted: 3/3/2009 3:06:02 PM EDT

[#20]

btt

Posted: 3/3/2009 3:17:41 PM EDT

[#21]

That's a great idea - assuming that it doesn't weaken the CH too much.

I've never broke a CH nor have I ever had gas blowback in my face, but it's interesting nonetheless.

Posted: 4/19/2009 5:58:40 PM EDT

[#22]

ok I finally did it!

here's my version. I admittedly screwed up, when drilling the bit got off course and blew out the bottom, so I just notched it out with a dremel. Its still plenty strong.

I cant provide a range report for some time...sorry.

Posted: 4/19/2009 6:45:49 PM EDT

[#23]

TAG

Posted: 4/19/2009 7:06:36 PM EDT

[#24]

I'll have to try that, nice idea.

What kind of paint you got going on there gas pain? Looks nice

Posted: 4/19/2009 7:08:26 PM EDT

[#25]

Is KAC not doing this on the SASS?

Good idea anyways

Posted: 4/19/2009 7:13:37 PM EDT

[#26]

Quoted:
Is KAC not doing this on the SASS?

Good idea anyways

http://www.knightarmco.com/images/sr25_3.jpg

well i'll be damned

Posted: 4/19/2009 7:45:20 PM EDT

[#27]

I did that years ago when the Gasbuster first came out. It does help a bit and since I am a lefty it was kind of needed. Plus, I was very cheap then and never liked to pay retail.

Posted: 5/3/2009 2:34:28 PM EDT

[#28]

Quoted:
I did that years ago when the Gasbuster first came out. It does help a bit and since I am a lefty it was kind of needed. Plus, I was very cheap then and never liked to pay retail.

Same here, I did the mod explained here a few years ago when I got my first .223/5.56 suppressor and it works pretty good but I also used a RTV/gasket sealant on mine in conjunction with the hole...........It does work good.

Posted: 5/3/2009 3:49:30 PM EDT

[#29]

Looks like I got a new project

[ARCHIVED THREAD] - Gaspains DIY AR15 Exhaust (update: made one pg1)

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