Results 1 to 15 of 25
-
12 March 2016, 07:00 #1
Intermediate and Rifle Length Gas
Hey guys. I'm just full of questions here. Trying to learn as much as I can. I've been trying to read up on intermediate and rifle length gas systems, especially in regard to how they work with a 16" barrel. I have a 14.5 mid-length that is very smooth-shooting, and I'm wondering about how intermediate, and even rifle length gas systems are on a 16". If anyone has experience with these, I'd like to know what you've experienced. Additionally, if you know of places offering these, let me know. I've found a few, but I don't know all of the places to look for who makes these.
Thanks again for any information or help. Mostly just trying to learn as much as I can!Graphic Designer
Instagram: @EO3actual
-
12 March 2016, 10:25 #2
I've been shooting Rainier Rock Creek Match barrels, 16" with Rifle Gas, and a 12.5" with mid-length gas. Both run, but they need to be tuned.
If you want a project shooter to tune and shoot very soft, it might be something for you.
-
12 March 2016, 11:58 #3
Closest I've ran is a MicroMOA 17.3" barrel with rifle gas. They're ported to work with 5.56 pressure stuff using a carbine buffer and Springco "White" spring, and a full weight bcg, and say they may not be reliable with anything under 5.56 loads.
I set mine up with an adjustable gas block and run a V7 Titanium bolt carrier and a Spike's T1 buffer with a Springco "White" spring. She's a pussycat.
The MicroMOA barrels are definitely ported small though. Even with my lightweight bcg, my gas block is running only one click from full open as that's where I've found the reliability.
No experience with a 16" on rifle gas.-One Nation, Under God
-"The bad news is time flies. The good news is you're the pilot." ~ Michael Althsuler
-
12 March 2016, 12:04 #4
-
12 March 2016, 12:49 #5
It is, but I don't think I'll go through the trouble or expense (mostly the expense) of setting up another gun with a lightweight bcg. At the time I wanted the smoothest, softest, flattest shooting rifle I could make with legs to really reach out there. At least in 5.56 terms.
And that's really what I got. That said, it doesn't seem to be a HUGE improvement over a 16" middy running a heavier buffer and/or spring, and that's with both the rifle gas and low reciprocating mass in play. It's not the same as adding a brake per se. More like going from a pure flash suppressor to a sorta kinda good hybrid device.-One Nation, Under God
-"The bad news is time flies. The good news is you're the pilot." ~ Michael Althsuler
-
12 March 2016, 14:35 #6
-
12 March 2016, 16:41 #7LEO / MIL
- Join Date
- Aug 2011
- Posts
- 667
- Downloads
- 0
- Uploads
- 0
For the OP:
I think dissipator (spelling?) pattern uppers have been discussed in detail in the forum a few years ago. May be worth looking into if you are curious about non-standard gas system/ barrel length combinations.
Spoiler: You don't get much more compared to the standard combinations.
-
12 March 2016, 16:48 #8
-
12 March 2016, 18:03 #9
-
12 March 2016, 19:40 #10LEO / MIL
- Join Date
- Aug 2011
- Posts
- 667
- Downloads
- 0
- Uploads
- 0
Your right.
Original dissipator-style rifles were tested by colt. They started with 20" barrels with rifle gas systems. The barrels were cut to 16", gas ports opened etc.
Bushmaster started selling a 16" barrel with carbine gas and rifle FSP configuration as a way to make something that was similar to colt's design but was arguably more reliable. They coined the term "dissipator" and the term stuck.
I think that in general, when people refer to a dissipator they are referring to a 16" barrel and a rifle length gas system.
-
13 March 2016, 00:59 #11
I've got an 18" Noveske SPR with an intermediate length gas system. Runs like a champ with anything from el cheapo 55gr .223 to heavier NATO pressure stuff like Black Hills Mk 262. The two mid-length gas 14.5" guns i own likewise will eat anything i feed them and are generally soft shooters.
"It's time to start slapping people." - George Carlin
NRA Life Member | SAF Life Member | FPC Member
ΜΟΛΩΝ ΛΑΒΕ
-
14 March 2016, 02:25 #12
"Dissipator" means a full front sight "a-frame" at the rifle position and a carbine or midlength gas tube wi low-profile gas block under the handguards.
KAC's gas tube length is proprietary and is longer than a standard mid-length. They simply took the gas tube from their .308 carbine and used it on the 5.56 version.
The further you deviate from the standard, the. Pre fiddle-fuck you endure. That goes for even the vaunted "mid-length" used by Armalite for 20+ years and popularized in the last half-decade. There seems to be a sense that if carbine is bad, and mid-length is better, then intermediate must be better still and rifle length better than that. There is a point of diminishing returns and the fiddle-fuck increases with the gas tube length, as reliability decreases.
People ask questions about what the "standard" is for the gas tubes longer than carbine. There isn't one. Truth be told, there isn't a standard for the carbine length either unless you're using a 14.5" barrel. Therein lies the problem.WWW.TACTICALYELLOWVISOR.NET
-
23 March 2016, 18:37 #13
I have a question that ties in with the OP's original query. On a rifle length gas system, with a full auto weight carrier, how heavy is "too heavy" with regard to the buffer? I ask because I have an H-Buffer in a rifle length AR but the weapon feels unbalanced to me as I have it currently setup. I was considering putting in a heavier buffer to try and balance it out but am concerned that it may slow the timing down too much and cause cyclical issues especially under rapid fire conditions. Thank you.
Sturgill Simpson - You can have the Crown https://youtu.be/tNV16tz1NK0
-
23 March 2016, 19:49 #14
As a point of reference, a rifle buffer weighs 5.2oz. A carbine H buffer weighs 3.8oz, an H2 is 4.6oz, and an H3 is 5.4oz. Buy some buffers and experiment. Run the heaviest buffer that still gives you reliable operation.
*Don't quote me on those weights, but i'm pretty sure they're correct."It's time to start slapping people." - George Carlin
NRA Life Member | SAF Life Member | FPC Member
ΜΟΛΩΝ ΛΑΒΕ
-
24 March 2016, 03:23 #15