sarduy
Member
can anyone tell me what's a "DISSIPATOR UPPER HALF"? i know there is a Full lenght, CAR, and M4...but i just came across a DISSIPATOR UPPER HALF....what's the difference between a DISSIPATOR UPPER HALF and a standar lenght ar?
Dissipator Upper Half
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The barrel.
Essentially, it's a 16" barrel with a handguard from a 20".
16" Dissipator:
20" rifle and 16" carbine:
The gas block is under the Dissipator handguard, not at the front sight base like on a standard 20" or 16" configuration:
A Dissipator actually does not have a rifle-length gas system. It has rifle-length handguards and a rifle-length sight radius, but as you see above, it has a carbine-length gas system.
Essentially, it's a 16" barrel with a handguard from a 20".
16" Dissipator:
20" rifle and 16" carbine:
The gas block is under the Dissipator handguard, not at the front sight base like on a standard 20" or 16" configuration:
A Dissipator actually does not have a rifle-length gas system. It has rifle-length handguards and a rifle-length sight radius, but as you see above, it has a carbine-length gas system.
ChristopherG
Member
16" barrel, but with a rifle-length handguard and sight location, right? Bushmaster makes 'em with a Carbine length gas system; when CMMG uses a mid-length gas system, I don't know if it technically qualifies as a Dissipator. P'rhaps someone who knows will clarify further.
modifiedbrowning
Member
Actually, the real dissipator by by Bushmaster is a carbine length gas system with an extra front sight tower at the end of the handguards.
rero360
Member
I believe, and I could be wrong, that the dissipator is a 16" barrel with a rifle length gas system instead of the normal carbine gas system found on most 16" guns. This gives you the shorter barrel length but with the longer sight radius of a full sized rifle. I personally think they are weird looking and saw one fail during an appleseed shoot, one failure on her lower (buffer retainer pin came out) and then a stuck round in the chamber after we put her upper on my RRA lower, I believe that the culprit was poor handloads that her husband had made, beat my buffer up something mean.
Now there IS a different gas system. This is a mid-length upper. It's also a 16" barrel, but with a handguard and gas system that are both longer than the standard carbine. The handguard is shorter than the Dissipator, of course.
See the above picture for the Dissipator confiuration under the handguards.
See the above picture for the Dissipator confiuration under the handguards.
OP
OP
sarduy
Member
Thanks a lot...
i love THR people, very very helpful info!
i love THR people, very very helpful info!
Eightball
Member
Dissipators with the rifle length gas system seem to have reliability problems, as there isn't enough pressure to cycle the action properly after the bullet passes the barrel. Rifle length gas system on an 18"? Sure. On a 16"? Nope. Nifty concept, though I figured it would mess with barrel harmonics less to just get a Mid-length anyway, and be halfway between the benefits of a sight radius from a Dissipator, and get the (IMO) better location for the gas block over a CAR system. YMMV.
Though, I wonder how effective a "dissipator" style quad-rail (rather than fixed FSB) w/mid-length gas setup would work? Same principle of rifle sight length, reliability of mid-length, adaptability of quad-rail to fit whatever front sight and/or accessories you wish.....seems to me like it might be the next style upper I buy
Though, I wonder how effective a "dissipator" style quad-rail (rather than fixed FSB) w/mid-length gas setup would work? Same principle of rifle sight length, reliability of mid-length, adaptability of quad-rail to fit whatever front sight and/or accessories you wish.....seems to me like it might be the next style upper I buy
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