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Thread: AR-15 DI to piston conversion?

  1. #41
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    Quote Originally Posted by dylank0723 View Post
    Hey. I've got a colt 6920. No problems whatsoever. But I've been reading about the piston ARs and the benefits. Just wanted to get some opinions about converting it to a piston system. Thinking about the CMMG kit from Brownell's. Thanks everyone!!
    It's kinda like trying to put a junkyard LS2 into a brand new M3... sure you can do it, and it'll probably work if you spend enough money on it, but you're taking something hat's been engineered to work really well, and shoe-horning a system that is actually less sophisticated and has some of its own problems onto there.

    On a 6920, absolutely don't bother. Spend money on a good sling, good weaponlight, good magazines, and a case or two of ammo; then start seeking the most skilled trainers you can to get to and start making the software improvements (and give yourself the opportunity to validate the configuration you have in mind for the rifle as a tool). If you wind up looking at a suppressed short-barreled setup, then it would be worth including a gas piston complete upper into the equation, but I'd still argue that an adjustable gas block and VLTOR/BCM A5 lower setup will still give you a wider operation range suppressed/unsuppressed with a variety of ammo (not to mention smoother shooting).
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  2. #42
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    Quote Originally Posted by dylank0723 View Post
    Hey. I've got a colt 6920. No problems whatsoever. But I've been reading about the piston ARs and the benefits. Just wanted to get some opinions about converting it to a piston system. Thinking about the CMMG kit from Brownell's. Thanks everyone!!
    The Army also looked at an op rod system in 1968. It proved to be less reliable, more complicated, recoil impulse was harsher, muzzle climb was higher, it was more difficult to manufacture, harder for soldiers to disassemble, and offered nothing but cons, no pros. The Colt Model 703


  3. #43
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    Quote Originally Posted by LRRPF52 View Post
    The Army also looked at an op rod system in 1968. It proved to be less reliable, more complicated, recoil impulse was harsher, muzzle climb was higher, it was more difficult to manufacture, harder for soldiers to disassemble, and offered nothing but cons, no pros. The Colt Model 703
    Time for an intervention before this thread goes full barfcom, which is where it is headed with this last post.

    The question was conversion of a DI rifle. The debate of DI vs. Piston is more than settled and there is a place for both in this world. If there were no place for Piston rifles, the market would have spoken and there would be none, which is definitely "not" the case.

    With all of those definitive piston "drawbacks" please to 'splain the US adoption of the M27 IAR and HK416 by the Marines and NSW respectively. They're all just a bunch of retards right?

    Not to mention the {gasp} piston operated SCAR family that are also quite popular with firearms enthusiasts. Though technically not "AR's."

    But thanks for the ancient history lesson just the same.

    Not gonna change it none. Just gonna shoot it lol.
    Wise choice OP.....I have no experience with the piston systems you ask about but am sure there are folks here who do.
    Last edited by HKGuns; 02-03-15 at 21:48.

  4. #44
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    After trying to deal with successive problems related to carrier tilt, malfunctions, ejection problems, etc, my brother finally got to the point of admitting defeat with his Adams Arms piston conversion kit, and converted that rifle back to DI.

    I don't have experience with their complete uppers.

  5. #45
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    Quote Originally Posted by HKGuns View Post
    Time for an intervention before this thread goes full barfcom, which is where it is headed with this last post.

    The question was conversion of a DI rifle. The debate of DI vs. Piston is more than settled and there is a place for both in this world. If there were no place for Piston rifles, the market would have spoken and there would be none, which is definitely "not" the case.

    With all of those definitive piston "drawbacks" please to 'splain the US adoption of the M27 IAR and HK416 by the Marines and NSW respectively. They're all just a bunch of retards right?

    Not to mention the {gasp} piston operated SCAR family that are also quite popular with firearms enthusiasts. Though technically not "AR's."

    But thanks for the ancient history lesson just the same.



    Wise choice OP.....I have no experience with the piston systems you ask about but am sure there are folks here who do.
    Actually its now YOU thats complicating this thread with your HK worship.

  6. #46
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    Stoner made a fine piston AR. Its called the AR-18.

  7. #47
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    Also in a SHTF situation you can use parts outa just about any DI gun,with the piston gun your gona have to find another piston gun to get parts. As you can see most of the ones your gona find are going to be DI. There is no reason to change a 6920 in the end you will be putting it back DI,save your money and buy ammo and go shoot it.

  8. #48
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    ^^^This. It's great to be able to have a set of common spare parts for multiple rifles. Saves money on extra parts, and reduces the weight of my range bag.

    The example of an Adams Arms piston gun that I fired seemed reliable and handled very nicely, but it is a lot more expensive than a similar quality DI gun, which has been enough to keep me solidly on the traditional side of that fence.
    Last edited by sevenhelmet; 02-06-15 at 12:44.
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  9. #49
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    Cool

    I did an Adams Arms piston conversion about four or so years ago to an older Bushmaster (circa 2001). I know, crap to more crap but that wasn't the case as the BM ran fine for many years before the conversion and it ran fine afterwards. I had also added a anti-tilt buffer and carrier and it proved to be reliable and accuracy was not affected. The BM also came from a time before they went to complete crap and that probably made a difference, also. But (a BIG but), in the end, the rifle wasn't any better after the conversion. Heavier but not better so it was all for naught; a wash. I later sold the upper to a friend and it carries on with no issues today that I know of.
    Would I do another? No. Would I recommend a conversion? No and I am now all BCM DI except for my 22LR upper. The conversion, in my experience, only added cost but not quality. Outside of the knowledge of doing it I ended up gaining nothing.
    Last edited by wetidlerjr; 02-06-15 at 12:52.

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  10. #50
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    Quote Originally Posted by HKGuns View Post
    Time for an intervention before this thread goes full barfcom, which is where it is headed with this last post.

    The question was conversion of a DI rifle. The debate of DI vs. Piston is more than settled and there is a place for both in this world. If there were no place for Piston rifles, the market would have spoken and there would be none, which is definitely "not" the case.

    With all of those definitive piston "drawbacks" please to 'splain the US adoption of the M27 IAR and HK416 by the Marines and NSW respectively. They're all just a bunch of retards right?

    Not to mention the {gasp} piston operated SCAR family that are also quite popular with firearms enthusiasts. Though technically not "AR's."

    But thanks for the ancient history lesson just the same.



    Wise choice OP.....I have no experience with the piston systems you ask about but am sure there are folks here who do.
    I woulsn't discredit him so quick, he seems to have a lot of experience in some areas alot don't.
    Quote Originally Posted by C4IGrant View Post
    Colt builds War Horses, not show ponies.
    Quote Originally Posted by Iraqgunz View Post
    This is 2012. The world is going to end this December and people are still trying to debate the merits of piece of shit, cost cutting crap AR's. Really?

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