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Posted: 10/2/2010 5:34:45 PM EDT
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I have a Rainer Arms upper (no barrel) & have tossed around the idea of a Disapator barrel for some time.
Most have stated that rifle length gas system on a 16" barrel have issues at hire elevations or refuses to cycle certain ammunition. So my second option would be a Mid-Length gas system, I have never owned a rig with this set up & know nothing about there Pros/Cons. I'm sure there is a post in the archive on this issue, if so please point me in the correct direction & disregard this post. Thanx in advance. 
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The usual form of these threads is comparing midlengths to carbine length for 16" barrels. Rifle length is essentially the opposite extreme... late timing and little dwell makes gas port size critical and gas system typically has minimal extra energy to overcome fouling or extreme climate (cold) conditions.
Since the common form of "dissipator" (from Bushmaster) takes the form of a carbine length gas system hidden underneath the full length handguards, here's the typical carbine v. midlength discussions... http://www.ar15.com/forums/topic.html?b=3&f=118&t=512091&light= http://www.ar15.com/forums/topic.html?b=3&f=118&t=510516&light= http://www.ar15.com/forums/topic.html?b=3&f=118&t=510555&light= Oldie but a goodie... http://www.ar15.com/forums/topic.html?b=3&f=118&t=435853&page=1� The long and short is that midlength is functionally a better gas system length for a 16" barrel than either carbine or rifle length in the AR platform. ADCO has a midlength gas dissipator-like barrel available, which is what I'd recommend if you are interested in that kind of configuration. Another alternative is just using a full length free float tube over a low profile gas block on a midlength gas barrel aka a "Recce" configuration. |
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Quoted:
The usual form of these threads is comparing midlengths to carbine length for 16" barrels. Rifle length is essentially the opposite extreme... late timing and little dwell makes gas port size critical and gas system typically has minimal extra energy to overcome fouling or extreme climate (cold) conditions. Since the common form of "dissipator" (from Bushmaster) takes the form of a carbine length gas system hidden underneath the full length handguards, here's the typical carbine v. midlength discussions... http://www.ar15.com/forums/topic.html?b=3&f=118&t=512091&light= http://www.ar15.com/forums/topic.html?b=3&f=118&t=510516&light= http://www.ar15.com/forums/topic.html?b=3&f=118&t=510555&light= Oldie but a goodie... http://www.ar15.com/forums/topic.html?b=3&f=118&t=435853&page=1� The long and short is that midlength is functionally a better gas system length for a 16" barrel than either carbine or rifle length in the AR platform. ADCO has a midlength gas dissipator-like barrel available, which is what I'd recommend if you are interested in that kind of configuration. Another alternative is just using a full length free float tube over a low profile gas block on a midlength gas barrel aka a "Recce" configuration. Thanx again, It's good to have some reading & research to go on. |
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The only con with a middy is that there are fewer hand guard options than a carbine. The reality is that there are enough that you won't be disappointed. If you plan on a Dissy with a fixed FSB then you will only need to concern yourself with rifle length hand guards.
I own a middy and a carbine length gas system. I do prefer the middy over the carbine, but you'd be fine with either. |
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