AR-15 platform: gas piston, or gas impingement?
This is a discussion on AR-15 platform: gas piston, or gas impingement? within the Defensive Rifles & Shotgun Discussion forums, part of the Related Topics category; Am considering an AR-15 style rifle, but specifically want to understand the pros/cons of one specific system, at this point: the gas system.
In particular, ...
January 8th, 2007 10:38 PM
AR-15 platform: gas piston, or gas impingement?
Am considering an AR-15 style rifle, but specifically want to understand the pros/cons of one specific system, at this point: the gas system.
In particular, I would like specific feedback from folks that have direct experience with either (a) a standard AR with gas-impingement operation, or (b) a variant AR with gas-piston operation, or (c) both.
To my way of thinking, dumping hot and dirty gas from the end of the barrel into the action mechanisms doesn't seem a very smart thing to do. Yeah, I know: the troops have used this for a long time. A number of companies are trying to address this one aspect of the AR's operating mechanisms.
There are alternative gas-piston systems out there, notably AR-15 class rifles by Olympic Arms with their OA platform rifles, Patriot Ordnance with their P-415/416 rifles, the Robinson Arms XCR, and the Leitner-Wise CP and SOC rifles.
Questions, for both platforms:
- At what point during shooting does your gun dump get fouled such that it absolutely requires cleaning (if you've hit that limit)?
- Have you ever gone 500rds without cleaning out the relevant fouled (action/chamber) areas on your gun without a failure?
- What, if any, difference in reliability have you found in the gas-piston variant versus the standard AR-15?
- Which would you pick and why?
For sheer sense of design and the potential for improved reliability and durability, I'm leaning toward the gas-piston variants. However, other than Olympic's system, the others are relative newbies on the market with their gas-piston systems, and I'm not too fond of being a guinea pig.
Let 'er rip.
January 9th, 2007 11:56 AM
cut and paste from the other thread....
Gas operated is fine IMO. I have used it in desert and winter conditions with minimal cleaning and some harsh treatments. Not to mention harsh treatments from many Marines before me. Although carbon builds up, it self limiting because of the movement of the bolt.
I've fired about 300 rounds out of a bone dry M-16 with no problems, I've dumped multiple mags on 3 rnd burst until the bbl glowed a dull red with no problems etc....
January 9th, 2007 12:06 PM
I've never had an issue with eithier one, but I do tend to keep my rifles clean.
January 9th, 2007 12:22 PM
The most I've run at a time has been ~900 rounds at a range day with some friends. No malfunctions attributable to the gun at all (had one bad mag, which was ID'd early and removed from the pool - no other issues).
Originally Posted by ccw9mm
This is in a standard gas impingement design (Bushy M4A3).
IMHO, if it ain't broke, don't "fix" it. No matter how well designed, the fact is that the piston variants are all adding moving parts, some with close tolerances. That's adding more potential failures.
(n) - a list of things that aren't going to happen if you are attacked.Blame it on Sixto
- now that
is a viable plan.
Learning to shoot again : Starting Over
January 17th, 2007 04:27 AM
At this years Shot Show 2007 a SWAT Team was looking for a suppressor their SIG 552's. Sorry, but it uses a piston operation and will not allow a sound suppresor to function properly without causing a catastrophic failure. Just one thing to think about if your ever going to want to mount a sound suppressor.
The SWAT boys walked around with their tail between their legs when each and every suppressor manufacturer told them it's not a good idea to suppress that operating system.
Gas impingement is just fine.
U.S. Army retired
January 17th, 2007 04:46 AM
That may be true for particular weapons, but it's certainly not true for piston operation in general. The Robinson Armament XCR, for example, functions fine with a suppressor. Check out the entry on their Technical Updates page or this video of an XCR with a suppressor on it.
Originally Posted by Skygod
January 17th, 2007 07:39 AM
The big problem, IMO, is not that the gas impingement system requires excessive cleaning to maintain reliability, it's that it is simply more difficult to clean. The "star chamber" on the AR series is notoriously hard to clean properly, and if you don't clean it properly, it can cause problems.
That being said, I have absolutely no problems with the standard gas impinged ARs from any quality manufacturer, and can tell plenty of war stories about abused, dirty, wet, frozen, et cetera M16s/M4s that have functioned flawlessly for hundreds and hundreds of rounds without being cleaned. As has been mentioned - if it were truly an unreliable system, it wouldn't be the longest serving standard long arm in the history of the US Military...
A man fires a rifle for many years, and he goes to war. And afterward he turns the rifle in at the armory, and he believes he's finished with the rifle. But no matter what else he might do with his hands - love a woman, build a house, change his son's diaper - his hands remember the rifle.
January 17th, 2007 08:20 AM
My AR works fine. I like the ease of cleaning and access to all parts. Most rifles it would be a bigger chore to strip down .
"In matters of style, swim with the current; in matters of principle, stand like a rock." Thomas Jefferson
Nemo Me Impune Lacesset
January 17th, 2007 08:42 AM
IMHO the whole piston + ar action thing is another solution in search of a problem . You will just replace one set of issues with another by changing the way the system operates . Realisticly either should be fine as long as the arm is maintained but I for one would not pay a premium for one over the other , nor would i worry about which one i had .
Make sure you get full value out of today , Do something worthwhile, because what you do today will cost you one day off the rest of your life .
We only begin to understand folks after we stop and think .
Criminals are looking for victims, not opponents.
January 18th, 2007 01:16 AM
Related note from John Farnam
January 18th, 2007 07:42 AM
But let's note that he's talking about attempts to RETRO-FIT AFTERMARKET parts to "stock" AR-15s.
Originally Posted by gunmetal
John LOVES the Robinson XCR, and has found it to be stone-cold reliable through multiple courses
Life Member - American Society of Armed Political Malcontents
Question Authority. Hang As Necessary!
In God I Trust. Everybody Else Keep Your Hands Where I Can See Them!
January 23rd, 2007 03:50 AM
Thanks for the comments, everyone. After handling a few more and speaking with a number of folks at the range, basically everyone's of the same opinion: quality gun, quality mags, tuned and cleaned, a decent AR should have no more issues than anything else, gas impingement or not.
So. I just purchased a Stag 3L (lefty). Will worry about an SBR conversion once I've wrung out the gun at the range. Or, earlier, if the Pelosi virus hits too hard.
By Diesel 007 in forum Defensive Rifles & Shotgun Discussion
Last Post: September 28th, 2014, 03:28 PM
By noonan in forum General Firearm Discussion
Last Post: July 12th, 2010, 07:24 PM
By los in forum Defensive Carry Guns
Last Post: April 22nd, 2010, 08:09 PM
By TN_Mike in forum Defensive Rifles & Shotgun Discussion
Last Post: October 26th, 2009, 03:06 PM
By comeandtakeit in forum Defensive Carry Guns
Last Post: October 29th, 2007, 08:45 PM
Search tags for this page
ar 15 gas impingement vs piston
ar 15 piston vs gas
ar platform pros and cons
ar-15 gas piston vs gas impingement
ar15 gas piston operation
best ar 15 platform
best ar-15 platform
best ar15 platform
gas impingement vs gas piston
gas piston vs gas impingement
is the olympic arms ar 15 gas impingement
olympic piston ar
Click on a term to search for related topics.