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Posted: 1/3/2020 7:33:32 PM EDT
[#1]
It’s referring to the gas system. There’s carbine, mid-length, and rifle going from shortest to longest. You need to know what length your barrel’s gas port is drilled to determine what you need. The longer the gas system the softer the rifle shoots and the longer the dwell time I believe. Someone correct me if I’m wrong.
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Posted: 1/3/2020 7:40:56 PM EDT
[#2]
Gas system length is what they're referring to. Carbine length gas on a 16" barrel can be snappy, consider an H2 Buffer. I'd recommend going midlength on the gas for a 16" barrel. Remember to have enough handguard to cover the gas tube length and protect the gas block, especially if you get one of those screw on low profile gas blocks for $14.
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Posted: 1/3/2020 7:41:40 PM EDT
[#3]
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Posted: 1/3/2020 9:31:29 PM EDT
[#4]
I'd just go mid-length with a standard buffer and spring, and a carbine buffer tube. Overall not going to be a huge difference vs the carbine length, but I like the appearance of a longer handguard a little better. If going with a free float handguard, it's moot, although the mid is smoother to shoot.
As other have already stated, it's just the length of the gas system. The other side to this, though, is that some people think that the carbine gas system will cycle more reliably when things get really dirty. I guess I never got dirty enough to notice... |
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Posted: 1/3/2020 9:54:22 PM EDT
[#5]
Quote HistoryQuoted:
It’s referring to the gas system. There’s carbine, mid-length, and rifle going from shortest to longest. You need to know what length your barrel’s gas port is drilled to determine what you need. The longer the gas system the softer the rifle shoots and the longer the dwell time I believe. Someone correct me if I’m wrong. |
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Posted: 1/4/2020 3:14:20 AM EDT
[#6]
The posts above are all correct. just to add my 2 cents I would suggest the mid length gas for the softer recoil and cycling of the rifle. The mid length causes less wear and tear on a rife and it’s assorted parts then a carbine system, the wear and tear difference between the two isn’t astronomical by any means but it’s there.
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Posted: 1/4/2020 9:59:47 AM EDT
[#7]
It also gets confusing, because you also have carbine and rifle buffer assemblies. They are totally independent of the gas system.
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Posted: 1/4/2020 11:52:53 AM EDT
[#8]
Thank you all for sharing this info. It's just what I needed. I understand this much better now. The photos are very helpful (worth many words).
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Posted: 1/4/2020 11:58:48 AM EDT
[#9]
By the way I'll just put out here, after reading these post I feel myself leaning towards an 18" barrel with mid length gas system and carbine buffer.
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Posted: 1/4/2020 12:19:52 PM EDT
[#10]
Quote HistoryQuoted:
By the way I'll just put out here, after reading these post I feel myself leaning towards an 18" barrel with mid length gas system and carbine buffer. If you are looking for an 18" barrel, I would suggest an Intermediate gas system length, or a rifle length as an alternative instead of midlength. The second photo above is incorrect - a "dissipator" is a carbine gas system hidden underneath rifle length handguards and with a front sight base at the rifle position. What that photo calls a dissipator is just a 16" barrel with a rifle length gas system. |
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Posted: 1/4/2020 10:48:08 PM EDT
[#11]
Longest gas system you can run with chosen barrel length.
Less recoil. Less wear and tear. |
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Posted: 1/4/2020 11:02:14 PM EDT
[#12]
Quote HistoryQuoted:
By the way I'll just put out here, after reading these post I feel myself leaning towards an 18" barrel with mid length gas system and carbine buffer. |
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Posted: 1/9/2020 8:05:16 AM EDT
[#13]
Quote HistoryQuoted:The second photo above is incorrect - a "dissipator" is a carbine gas system hidden underneath rifle length handguards and with a front sight base at the rifle position. What that photo calls a dissipator is just a 16" barrel with a rifle length gas system. The Colt Model 605 was the original "Dissipator" developed around 1963-64: 
The Model 605 was the first "carbine" version of the AR-15, it had a 15" barrel with the standard rifle gas system, similar to the photo. However, these were not as compact as the later CAR-15 and faded. The idea of a carbine gas system under the handguards with a standard front sight is a new development to increase the reliability, and since it looks like the 1965 "Dissipator" it has been called such. (Some, more correctly refer to this arrangement as a "faux-Dissipator" So, what is pictured is a "Dissipator" in the form of the original, and what you refer to is a "Dissipator" in the modern sense. 
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Posted: 1/9/2020 11:07:41 AM EDT
[#14]
Quote HistoryQuoted:
Errrr, not quite that simple.... The Colt Model 605 was the original "Dissipator" developed around 1963-64: https://bpullignwolnet.dotster.com/retroblackrifle/sitebuilder/images/605-22-713x401.jpg The Model 605 was the first "carbine" version of the AR-15, it had a 15" barrel with the standard rifle gas system, similar to the photo. However, these were not as compact as the later CAR-15 and faded. The idea of a carbine gas system under the handguards with a standard front sight is a new development to increase the reliability, and since it looks like the 1965 "Dissipator" it has been called such. (Some, more correctly refer to this arrangement as a "faux-Dissipator" So, what is pictured is a "Dissipator" in the form of the original, and what you refer to is a "Dissipator" in the modern sense. Dissipator was invented and marketed by Bushmaster in the 90s (80s?). There is nothing "faux" about it, it is what it is. Believe they trademarked the name even at the time. It's simply incorrect to call a 16" rifle length a "dissipator". The whole point of the "dissipator" was to NOT be a 16" rifle length.  Attached File |
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