FightingWombat
Member
I want to make a gas piston AR-15A2 possibly a Dissipator, Just I'm not finding any piston kits that are rifle length that also allow for a A2 front sight. Anybody know of any?
Piston AR-15A2/Dissipator
- Thread starter FightingWombat
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Carter
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I had been looking at piston kits for awhile and all I found were carbine length and a few mid-length kits. I also believe almost all of them required losing the front sight.
sv51macross
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http://www.adamsarms.net/details.asp?sku=RPS-D-ADA
It's pricy; $380, but it is a rifle-lenght piston kit. And the block is railed at the same height as a flat-top, so finding a front sight won't be that hard.
It's pricy; $380, but it is a rifle-lenght piston kit. And the block is railed at the same height as a flat-top, so finding a front sight won't be that hard.
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ThePunisher'sArmory
Member
Unless you plan on jumping in a lake with your rifle or draging it through the mud, you dont "need" a piston system. Just build a standard gas dissipator.
Zerodefect
member
Skip the piston, it only makes an AR worse. Build a regular Dissy.
modifiedbrowning
Member
The Bushmaster Dissipator uses a carbine length gas system with a low profile gas block hidden under the handguards, other companies may use the carbine system also. So, theoretically you could use a carbine piston kit to build the rifle you want.
1KPerDay
Member
Stupid question... why were these called "dissipators"?
FightingWombat
Member
I'm going to get a regular 20" barrel and then if that felt too long either cut it down or get a dpms 16" A2 barrel which I believe is a rifle gas system
RainDownmyBlues
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1kPerDay said:
I've been wondering this too.
V
Van Blamm
Guest
I believe the dissipator title comes from the extra few inches of ventilation/ heat shielding provided by the full-length handguard. Basically the advantage of dissipator assemblies is the ability to equip a full-length quad rail so you can hang more crap off your gun without adding four inches to the barrel. Also, if you're using irons or BUIS it gives you a longer sight radius.
To all the die hard ar-15 owners get over the whole screw piston guns idea. It's where the entire industry is heading. I highly doubt in 5 years any manufacturer will make a Di gun any more. There is a better design and its a piston system. Your going to have build up regardless in any firearm but there are better places to dump it than in your guns chamber. Open your eyes. If he wants a piston system good for him.
RainDownmyBlues
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PT1911 said:
Ah good to know. Guess not important to me however, I pretty much always held it at the corner where the magazine/handgaurd meet. It will probably take years to break that habbit which formed over 5 years
And I have no use for other bits hanging off my rifle. Sling and optic, maybe a bipod if I build a replica of my SDMR I was issued. No need for NV in civvie life
1KPerDay
Member
Come now.
Quentin
Member
Nothing could be further from the truth. In fact, with so many proprietary AR piston designs out there, many will become orphans over the next decade as the industry standardizes and shakes out the piston losers. So if yours isn't one that survives - better buy parts from your manufacturer while you can. Of course with scores of manufacturers making standardized DI parts this isn't a worry for us with regular ARs.
Not saying don't get a piston if you want - good for you - but don't knock other people's choices. And be aware that someone is painting themself in a corner. Doubt that it's me.
Uh huh. If piston were actually the direction anything was going, everyone would be making Daewoo K2 clones, which is far better than these crazy short-stroke "anti-tilt" AR shoehorn mods. A piston that shoves the bolt carrier by 1 inch is just plain crazy, and I can't think of a single successful rifle that's used anything like that. Whereas the Daewoo uses a FAL type piston, AK type bolt carrier, and AR type bolt.
John Wayne
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I think "dissipator" refers to heat dissipation.
benEzra
Moderator Emeritus
Given that right now the DI AR is the most popular centerfire rifle in the United States, and that a whole lot of AR owners (both casual and serious) prefer the original DI system over piston-AR adaptations, I would say that they're not going away, in 5 years or 50. After all, they're still making 1911's...
Oh and with regard to the Osprey piston system, a couple of things that I should mention. As said before, it does run very well. I mean very well. Another perk is that the system is almost a closed system. In other words, it doesn't vent, but there is some blow by. Meaning that you will get a tad bit of carbon under the handguards, but it's really just a little bit, since there is no venting, just leaking (I guess).
The downside is that the system is advertised as being a very painless 5 minute drop in upgrade that can be undone in the same amount of time. In my experience, the installation is pretty simple and straight forward, but you do have to use an included solid steel pin (in place of the gas tube roll pin) to hold the piston chamber in place in the gas block/FSB. Getting it in isn't easy and takes a knack of sorts. Now, going back to DI isn't nearly as easy as they say it is. In reality, after you've put thousands of rounds through the rifle and carbon has built up, I've found that getting the steel pin out of the gas block is next to impossible without breaking either your tools or marring the finish on the block. Once you do get the pin out, I've never been able to get the chamber portion out of the block without separating the chamber from the spicket (which isn't supposed to happen).
For a KISS carbine that you plan to leave as a permanent piston rifle and only want to have to do a minimum of maintenance, the Osprey system is really nice. Just don't look for it to be a simple swap back and forth proposition.
The downside is that the system is advertised as being a very painless 5 minute drop in upgrade that can be undone in the same amount of time. In my experience, the installation is pretty simple and straight forward, but you do have to use an included solid steel pin (in place of the gas tube roll pin) to hold the piston chamber in place in the gas block/FSB. Getting it in isn't easy and takes a knack of sorts. Now, going back to DI isn't nearly as easy as they say it is. In reality, after you've put thousands of rounds through the rifle and carbon has built up, I've found that getting the steel pin out of the gas block is next to impossible without breaking either your tools or marring the finish on the block. Once you do get the pin out, I've never been able to get the chamber portion out of the block without separating the chamber from the spicket (which isn't supposed to happen).
For a KISS carbine that you plan to leave as a permanent piston rifle and only want to have to do a minimum of maintenance, the Osprey system is really nice. Just don't look for it to be a simple swap back and forth proposition.
heck ? i'ed say in five years.. the pistons will be GONE.
and the good ol' DI, will be with us forever
just like ugene stoner intended... Amen.
[20'' service rifles and dissipators rock !]
i wouldn't have a piston, but thats just me. i like my old skool retro stuff.
and the good ol' DI, will be with us forever
just like ugene stoner intended... Amen.
[20'' service rifles and dissipators rock !]
i wouldn't have a piston, but thats just me. i like my old skool retro stuff.
Zerodefect
member
Been said a hundred times: If you want a piston system get a Sig 556. Robinson XCR, Shrubby ACR, FN SCAR. Those weapons have the proper Ak like internal rails to prevent carrier tilt and enhance reliability.
Piston AR's have proven to be less reliable than a good combat grade AR IME. The Ar can only evolve so far, and piston conversions have crossed that line.
But be warned, while the new breed listed above offer slightly better reliabilty, they also come with rarer, more expensive parts. And they are all bigger, heavier, slower (swing weight), and slightly less acurate than an AR. Hard to get proper rifle length handgards on any of those as well.
IME, an AR vents it's piston gases out the ejection port before the chamber opens. It's not dumping anything in the chamber. What carbon dust gets cought by the action and slammed back in, has never really been an issue with my rifles. Just lube properly with something wetter than CLP.
And 16" dissys with rifle grips are alot of fun.
Piston AR's have proven to be less reliable than a good combat grade AR IME. The Ar can only evolve so far, and piston conversions have crossed that line.
But be warned, while the new breed listed above offer slightly better reliabilty, they also come with rarer, more expensive parts. And they are all bigger, heavier, slower (swing weight), and slightly less acurate than an AR. Hard to get proper rifle length handgards on any of those as well.
IME, an AR vents it's piston gases out the ejection port before the chamber opens. It's not dumping anything in the chamber. What carbon dust gets cought by the action and slammed back in, has never really been an issue with my rifles. Just lube properly with something wetter than CLP.
And 16" dissys with rifle grips are alot of fun.
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