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Direct Impingement Conversion?

Discussion in 'Black Rifle Forum' started by eaglefrq, Dec 7, 2011.


  1. eaglefrq

    eaglefrq
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    I recently got my first AR and it's a direct impingement. I've seen some kits to convert it to a piston and I'm trying to figure out why?

    I know the direct impingement have been around since the beginning and the pistons are fairly new.

    For a recreational shooter, is there a benefit to converting?
     

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  2. faawrenchbndr

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    They run cooler.
    They have a cleaner bore/chamber.
    They are to operate with less lube, because of the above.

    I've been shooting the M16/AR15 for 27 years. I AM a DI fan, but,
    I do see some pros and cons of a piston upper.
     

  3. eaglefrq

    eaglefrq
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    Other than being fairly new, are there any cons to the piston?

    I haven't had a chance to shoot mine yet, the only range around here is about 1 hr away and closes about the same time I get off work. I'm going this weekend to shoot.
     
  4. mjkeat

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    The only cons I know of are from them being proprietary. Some also claim they are overgassed as well.
     
  5. faawrenchbndr

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    Some state they are less accurate than a DI as well. More moving parts,
    heavier weight due to the additional parts. Some piston guns suffer from
    carrier tilt. Many have fixed this issue.

    I am VERY new to the piston upper, I chose an Adams Arms complete upper.
    Shown below on a BCM lower.......

    [​IMG]

    [​IMG]
     
  6. boomhower

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    Their are pluses and negatives to the piston system. Do some research and if you want one just get a quality system. LWRC would be my first pick but they certainly aren't cheap. LMT has gotten good looks as well. For the cheaper end AA would certainly be worth a look. If you get a system that isn't done right you'll have nothing but problems.
     
  7. WoodenPlank

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    They are not new in the least. They just never hit mainstream in the AR platform until recently.

    However, the piston is often more difficult to access for cleaning, parts are often proprietary, more reciprocating mass over the barrel can (and usually does) affect accuracy, carrier tilt in some systems, less rail systems and gas blocks available for modification/replacement.

    IMO, it's a solution looking for a problem. The only time I have seen serious benefit to a piston was with very short (12" or less) barrels, being run with a suppressor, and heavy volume.

    I'll gladly stick to my DI gun, and just keep it lubed.
     
  8. rockapede

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    While I don't think there is anything inherently wrong with the concept of a piston AR, look up Filthy 14 and tell me if a piston system is necessary. The two most important factors affecting AR reliability are the quality of the weapon and healthy lubrication.
     
  9. eaglefrq

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    Thanks to everyone for the info. It was more of a curiosity question than anything else. I think if I went home and told mama I wanted to get a conversion kit, I would have a black eye later that evening. :whistling:
     
  10. Eurodriver

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    I love when people buy piston conversion kits for their DPMS AR15s. :rofl:
     
  11. rockapede

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    Of course, a piston converted DPMS will never be complete without an optic worth more than the rifle and every part Magpul makes.
     
  12. faawrenchbndr

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    My hunting/go to rifle is a DI 6.8 SPC.......the AA upper'ed BCM is a "fun gun"
     
  13. WoodenPlank

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    Fixed that for accuracy.
     
  14. mixflip

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    I say dont convert it to piston because you think you "need" to. Chances are you dont.

    Change it because you simply want to.

    A failzero coated (nickle boron) bolt and BCG will not need hardly any oil due to its lubricity of its nickle boron coating and carbon fouling wont stick to it much either so cleaning is a since from what I hear?

    Look into all options before you buy a piston conversion. For the record, I own a piston gun and I am a big fan of them but I have no illusions of it being technically better. Its different. Period. It has its own share of weakness's.
     
  15. boomhower

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    This is true. Mine has never seen a drop of lue, they actually recommend against because it won't stick anyways. Not cheap but very very nice to have.


    Outdoor Hub mobile, the outdoor information engine
     
  16. Javelin

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    I honestly see no purpose of a piston on an AR. If you want a proper gas piston system there are plenty of other (and better) options out there for cheaper.

    :wavey:
     
  17. eaglefrq

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    Thanks for the advice. I was just curious if the pistons were better. I have no intention of converting it right now.
     
  18. Halojumper

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    My understanding is that it's actually the DI guns that are overgassed.
     
  19. Halojumper

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    Another thing to keep in mind is that the guns Eugene Stoner designed after the AR were piston guns. Apparently he felt it was an improvement FWIW.
     
  20. WoodenPlank

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    In both cases, it comes down to the individual barrel, gas block, etc.
     
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