Dissipators

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Anyone have one of these? I find it very nifty/handy looking and it kinda fills that gap of not having a 20" AR around even though its only 16". Im seriously thinking of one for my next AR...

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well I think mid length gas systems are preferred on these but you can have all either of the 3 configurations, rifle, mid length and carbine
 
I really like the idea of the longer sight radius, but think that a mid-length handguard is more esthetically pleasing to the eye with a 16" barrel. The barrel also doesn't stick out far enough to attach a bayonet if you run out of bullets - you'd have to throw your rifle at the zombie:)
 
I had one and it was a carbine length gas system. Yes under the handguards there's another gas block and short tube. I'm not really sure of the purpose.
I really liked the longer sight radius for my aging eyeballs.
 
My question is why would anyone bother putting a carbine or mid length gas system on a 16" barreled rifle that has a rifle length handguard and front sight/dummy gas block (other than to save a few $$ on production)
 
actually it probably doesnt save any money on production but different gas systems have different advantages, I have yet to find out what they are though...
 
yeah they could have put a rifle gas system and it would be good for me. Lots of the real users say they like the mid-length system.
Maybe it has to do with the buffer.

Yarr! I gots no idear what I'm talkin' about!:pirate:
 
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w squared said:
My question is why would anyone bother putting a carbine or mid length gas system on a 16" barreled rifle that has a rifle length handguard and front sight/dummy gas block (other than to save a few $$ on production)
Click to expand...

The purpose of the dissipator setup is to provide the handguard length and sight radius of a longer gas system, while actually having a short one.

So, you have rifle or midlength handguard and sight radius with a carbine system, or rifle handguard and sight radius with a midlength gas system.

The gas system is only pressurized during that period when the bullet is past the gas port, but has not yet exited the barrel. Thus, trying to run a short barrel with a longish gas system begets functioning problems, as the time/pressure curve has a very small area, due to its very short duration. For example, a rifle length system on a 16" barrel will provide only 3" of barrel past the gas port, as opposed to the 7" enjoyed by a 20" barrel with rifle system, 16" barrel with midlength system, or 14.5" barrel with carbine system.
 
On the movie The Bourne Identity U.S. Marines guarding a U.S. Embassy/Consulate in Switzerland are shown using Dissipators to clear the building of threats.

Anybody know if this is plausible?
 
Greenhorse six said:
They probable started out using the carbine system ,like back before anyone even thought about a mid-length system.
Yeah,you need so much barrel in front of the gas block for the action to work,don't think you could do that with a rifle length system.
Click to expand...

Which also raises the WHY question for a 14.5 midlength?
 
Well Gents

I have been working on dissipator for the last while. I stumbled across a very uniquie barrel made by DPMS. It has a 1 in 9 twist, and has a rifle length gas tube system. It is also a very heavy barrel, arround 0.9+.

Before I bought I check with a Tech with many years of experince working on varrious AR's and configurations, as well as teaching Armour couses. His thoughts were that the Rifle length gas system should work just fine. He went on further to say that such a system may actually be somewhat less temprimental than a carbine length system.

As such I decided to build a compact DMR style rifle, and am close to completion.

Here is a couple pictures of the barrel and hope to have a few of the complete project soon.

look forward to thoughts and comments.

regards

AbH

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dissy-3s.jpg
 
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