AR Sponsor
Posted: 4/5/2013 5:16:49 PM EDT
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Anyone using the CMMG piston kit?
A friend has one and thinks it is the best piston kit on the market. Anyone else have any personal experience using this piston kit? |
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Quoted:
It's a bitch to take apart to clean. I had one, never needed to clean it, ran great 1500 rds no cleaning no problems. I took it apart once to see the piston and such. That said the AA system is a better system for an "upgrade" just the ease of take down. I have a Stag M8 which uses what appears to be a similar or the same piston as a CMMG and it's a breeze to take apart for cleaning, etc. I'm not familiar with Adam Arms piston but I am curious to know what you found difficult about disassembling / cleaning the CMMG piston set up? How is the Adam Arms piston better? |
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Quoted:
Quoted:
It's a bitch to take apart to clean. I had one, never needed to clean it, ran great 1500 rds no cleaning no problems. I took it apart once to see the piston and such. That said the AA system is a better system for an "upgrade" just the ease of take down. I have a Stag M8 which uses what appears to be a similar or the same piston as a CMMG and it's a breeze to take apart for cleaning, etc. I'm not familiar with Adam Arms piston but I am curious to know what you found difficult about disassembling / cleaning the CMMG piston set up? How is the Adam Arms piston better? Stag piston is heavy duty and solid but...heavy/bulky. Adams Arms is simple, very easy to clean and lighter....also widely popular and more likely to be available in the future than most pistons!!! |
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I have a CMMG (carbine length) piston kit on my 14.5 BCM barrel, with a Samson Star EX rail.
I have run at least 1K through it with no issues. I don't think it's that difficult to take down. It's slightly heavier that the others, but the total weight of the rifle loaded is still only 10.3 lbs. |
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I have a Stag Arms Model 8 which uses the same piston system CMMG makes. It's definitely heavy duty but it's also extremely reliable.
The dude above claiming the AA kit easier to disassemble and clean is full of it. The CMMG kit is no harder to take apart than the AA system. |
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i have seen 2 CMMG piston kits in action personally, 1 was at a 2 gun match and it would not run to save the poor guys life, the other was on a 10.5 SBR that ran like a top.
i'm a Adams Arms guy, i feel they are the best kits out there. very easy to remove piston and op rod, vents gasses forward, not under the handguards and is pretty light weight. Stag is very very good company and i feel them using a CMMG type system should say something. on the flip side, Adams is used by Spikes, S&W, Core15, Huldra, ATI, etc........so the end user needs to be the judge. |
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Cleaning Procedures
Assure that the weapon is unloaded and follow all recommended firearm safety procedures. 1. Remove the gas plug (1) by depressing the plug detent and unscrewing the gas plug. 2. Remove the gas piston (2) and piston spring (3). NOTE: The gas piston may need to be tapped out depending on the amount of build up. 3. Insert a 0.375” cleaning brush with solvent, such as a 9mm bore brush, into the gas piston housing and scrub until all residue is removed to your satisfaction. Clean the piston and plug by simply wiping them down with solvent. 4. Remove all solvents. Any residual solvent will burn off when the weapon is fired. 5. Apply a small amount of oil to the piston plug before re-installing. 6. Re-assemble in reverse order, being careful to properly install the gas plug. Tighten all the way down to the ON position COPIED FROM CMMG WEBSITE |
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Quoted:
Cleaning Procedures Assure that the weapon is unloaded and follow all recommended firearm safety procedures. 1. Remove the gas plug (1) by depressing the plug detent and unscrewing the gas plug. 2. Remove the gas piston (2) and piston spring (3). NOTE: The gas piston may need to be tapped out depending on the amount of build up. 3. Insert a 0.375” cleaning brush with solvent, such as a 9mm bore brush, into the gas piston housing and scrub until all residue is removed to your satisfaction. Clean the piston and plug by simply wiping them down with solvent. 4. Remove all solvents. Any residual solvent will burn off when the weapon is fired. 5. Apply a small amount of oil to the piston plug before re-installing. 6. Re-assemble in reverse order, being careful to properly install the gas plug. Tighten all the way down to the ON position COPIED FROM CMMG WEBSITE How hard was that plug to remove? Did you use just your fingers?(<-- must have gorilla hands) If not did you keep a Tool in your grip to help unscrew it? Ever take a AA system down to clean? try it and tell me which is easier to clean... |
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Quoted:
Quoted:
Cleaning Procedures Assure that the weapon is unloaded and follow all recommended firearm safety procedures. 1. Remove the gas plug (1) by depressing the plug detent and unscrewing the gas plug. 2. Remove the gas piston (2) and piston spring (3). NOTE: The gas piston may need to be tapped out depending on the amount of build up. 3. Insert a 0.375” cleaning brush with solvent, such as a 9mm bore brush, into the gas piston housing and scrub until all residue is removed to your satisfaction. Clean the piston and plug by simply wiping them down with solvent. 4. Remove all solvents. Any residual solvent will burn off when the weapon is fired. 5. Apply a small amount of oil to the piston plug before re-installing. 6. Re-assemble in reverse order, being careful to properly install the gas plug. Tighten all the way down to the ON position COPIED FROM CMMG WEBSITE How hard was that plug to remove? Did you use just your fingers?(<-- must have gorilla hands) If not did you keep a Tool in your grip to help unscrew it? Ever take a AA system down to clean? try it and tell me which is easier to clean... Are you serious? Really? Unscrewing the gas plug isn't hard at all. You definitely don't need "gorilla hands" to do it. 
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Quoted:
Quoted:
Quoted:
Cleaning Procedures Assure that the weapon is unloaded and follow all recommended firearm safety procedures. 1. Remove the gas plug (1) by depressing the plug detent and unscrewing the gas plug. 2. Remove the gas piston (2) and piston spring (3). NOTE: The gas piston may need to be tapped out depending on the amount of build up. 3. Insert a 0.375” cleaning brush with solvent, such as a 9mm bore brush, into the gas piston housing and scrub until all residue is removed to your satisfaction. Clean the piston and plug by simply wiping them down with solvent. 4. Remove all solvents. Any residual solvent will burn off when the weapon is fired. 5. Apply a small amount of oil to the piston plug before re-installing. 6. Re-assemble in reverse order, being careful to properly install the gas plug. Tighten all the way down to the ON position COPIED FROM CMMG WEBSITE How hard was that plug to remove? Did you use just your fingers?(<-- must have gorilla hands) If not did you keep a Tool in your grip to help unscrew it? Ever take a AA system down to clean? try it and tell me which is easier to clean... Are you serious? Really? Unscrewing the gas plug isn't hard at all. You definitely don't need "gorilla hands" to do it. Meh to each his own,  I don't think I have jelly hands, but after 1000+ rounds it was much to hard for fingers. I kept a allen wrench that fit the hole of the piston plug in my grip to help out. My system ran fine, and so did my friends AA system. And when it was time to take his down, there was no wrench, no detent to depress, just push turn done.
The CMMG system works great, with a 5-7000 round interval before spring change thats a whole bunch of $$$ in ammo before you need to worry about a $5 part. But, if I was going to do piston again it would not be the CMMG system. |
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Exactly to each his own.... I have a love for piston guns Springfield M1A, Mini 14 , 30 carbines, and now AR piston platforms. Currently have an Adam Arms, CMMG, Sig, and Ruger. All have there good and bad points. The CMMG is by no means hard to take apart ( yes I use just my fingers... ) and no I am not a silverback. The toughest AR piston to get apart so far has been the Ruger but it was a very tight gun all around. The Adam Arms is easy to get apart but no more so than the CMMG and it seems a wee bit whimpy compared to my CMMG. All in all I like them all...... When it hits the fan my M1A is what I will go for first.
Just my two cents.... Try as many as you can and buy what you can afford.... |
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