Bushmaster Dissipator?


December 21, 2007, 03:41 PM
I am new AR systems and thinking of getting one. I am considering Bushmaster Dissipator at the moment for its short overall size and longer sight radius. Is there any advantage/disadvantage on this configuration when shooting as compared to M4s other than sight radius? My concern is that the muzzle is too close to the gas port that it may affect the cycling of the action especially when the system gets a little dirty. Thank you.

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Dave Markowitz
December 21, 2007, 03:45 PM
The Bushmaster Dissipator has its gas port on a shaved gas block underneath the handguards, in the same position as a carbine gas port. So don't worry about that part. Note that some other AR15 makers sell Dissipator-type rifles. They may or may not have a similar setup. I would not buy one which doesn't.

If you get one with an HBAR barrel profile, it will be heavy. IIRC, you can get a Dissipator with an M4 barrel profile, which would be a lot handier.

If you plan to use iron sights then the Dissipator offers a better sight radius than carbines. If you're going to use optics it doesn't offer any advantages over a carbine.

December 21, 2007, 05:44 PM
I've got a Bushie hbar dissi. It's pretty hefty, and when I swapped out the fixed stock for a collapso stock, the balance shifted dramatically towards the nose. The one advantage of this is negligible muzzle rise.

As Dave points out, the gas block is at the carbine position, not the rifle position.

Folks who spend time obsessing over AR-15 performance swear by the virtues of the mid length gas system, rather than the carbine gas system.

Therefore, if I had it to do all over again, I would get a flat top dissipator, with a mid length gas system and an m4 profile barrel.

Float Pilot
December 21, 2007, 06:14 PM
I have been wanting a Disappator (or however you spell it) set-up to replace the stubby 11.5 inch and long flash hider I currently have on my old Bushmaster. Better sight radius, in my case more velocity, and more of the hot barrel is under a handguard thus giving ou more options for support hand placement.
I just need to find somebody to buy my 11.5 one of these days.

December 21, 2007, 06:25 PM
Thank you guys for the response. Now I am learning.

December 21, 2007, 06:30 PM
I had a BM Dissipator and it was my favorite .223 ~ A2 stock and iron sights.
If I had to do it again I would get a flat top with an A2 stock.

I sold my Dissi to help fund my very first M14 clone :D

December 21, 2007, 06:34 PM
I had a Bushy Dissapator. I liked it when I first got it, but I grew to dislike it pretty quick. Mine has the heavy barrel, which I though was the only way they came, or at least when I got mine they were. I've never seen one with a "light" barrel. The rifle is muzzle heavy and just heavy in general.

Even with the heavy target type barrel, it wasnt all that accurate. Of all the AR's I own or have owned, it was the least accurate. It also had some function issues when I first got it, but it got better.

I dont know if the few added inches of sight radius is really an issue. I have 16" mid length guns that shoot better using the iron sights. Truth be told, the only "fixed" iron sighted AR I shoot these days is my old SP1. I prefer flattops with Aimpoints (with cowitnessed BUIS) and/or a Leupold 1.5x5 over the irons. The flat tops are way more versatile, and the medium profile barrels much handier. The rifle is also more balanced, both weight and look wise with the carbine/mid length furniture.

Bottom Gun
December 21, 2007, 08:24 PM
My A2 Dissipator has the heavy barrel with carbine gas system. I like it. The longer sight radius really helps and this one is very accurate.
I find the heavy barrel makes for a steadier hold than the lighter weight barrel when I'm shooting offhand.
I have never had any malfunctions or issues with this one even when running the dreaded Wolf ammo through it.

Everyone has different preferences in these. If I were buying another, it would be the same as this one.

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