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Thread: Opinions on Adam Arms Mid-length Piston Upper

  1. #61
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    Quote Originally Posted by Tzook View Post
    That's exactly what I did. The piston system itself is great, I can't speak for the rest of Adams Arms parts. I never had any sort of a carrier tilt issue, ultimately I just got tired of the extra weight and sold it off. If you NEED a piston, Adams Arms is definitely one of the better choices.
    This strikes me as backward - if you get the complete upper the gas block is pinned, while if you get the add-on kit it's a clamp-on. Alignment and spacing of the parts is especially critical in a piston system, and with a complete upper you get that done by the factory with their warranty if it's wrong.
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  2. #62
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    Opinions on Adam Arms Mid-length Piston Upper
    My opinion: If you want a piston gun, get one that was designed as such from the ground up. That would mean something like an FN SCAR, HK93, etc. There are just way too many reports of piston designs failing for me to have faith in one. I did own a CMMG piston upper. It locked up solid after 3 rounds. CMMG rebuilt it for free and I sent it on down the road.

  3. #63
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    Quote Originally Posted by 500grains View Post
    That would mean something like an FN SCAR, HK93, etc.
    HK93 is a roller locked, so try again...

  4. #64
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    Quote Originally Posted by DeltaSierra View Post
    HK93 is a roller locked, so try again...
    I had a "wait a minute..." moment when I saw that too.
    We miss you, AC.
    We miss you, ToddG.

  5. #65
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    Quote Originally Posted by ruthless View Post
    Since the newbie dug up the post. What say you Phila? Keep it, or sell it?
    I have shot the piss out of my Adams Arms 16" piston upper using nothing but Wolf .223 H/P ammo and so far no issues. I have not clean the upper since the first customary cleaning out of the box and she is still running strong.

    Pluses,
    Runs well
    Inside upper/lower receiver has minimal fouling
    Minimal lubing required
    No signs of excessive wear

    Dislikes,
    I still think on the base model the upper receiver coating is a bit cheap but barrel and bolt which are Melonite treated look great.

    I called A/A and asked if my upper receiver could be Melonite treated because I was not happy with the current coating and I should have a answer in the next day what they are going to do.

    4.0 stars out of 5.0 because of the upper receiver finish but if A/A refinishes it for me in Melonite it will earn a extra star and a buy recommendation.
    We are all inclined to judge ourselves by our ideals; others, by their acts.

  6. #66
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    shot the piss out of = about how many rounds. Sounds like a great review. I'm gonna get one.

  7. #67
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    I called A/A and asked if my upper receiver could be Melonite treated because I was not happy with the current coating and I should have a answer in the next day what they are going to do.
    The answer will be, you cannot. You cannot melonite aluminum.

  8. #68
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    Quote Originally Posted by Phila PD View Post
    Received my Adams Arms complete mid-length piston upper back yesterday from the manufacturer and it appears they completely replaced the unit. This one is in much better condition then the one I received from Midway which I now strongly feel was a return they sold as new.

    The reason I feel the unit was a resold return was the bolt and flash suppressor had carbon deposits and the finish showed contact marks that it had be mounted to a lower receiver.

    Now these marks could have occurred when Adams Arms test fired the unit after assembly but the replacement upper displayed none of the carbon or wear signs the old unit did.

    So I give Adams Arms good marks for fully replacing the unit with new but I still have to give failing grades on being able to contact their customer service and the lack of contacting you back when they promise to do so.

    Also I requested to purchase a MagPul Mid-length MOE forearm from Adams Arms and to have it fitted by them to replaced the standard set supplied on the upper. Matt agreed and stated it would be done, but I received the unit back wearing the standard set. I was not charged so its more of a inconvenience of them not following through with a parts replacement order.

    I post a review once I have a chance to test fire the upper.
    I ordered a sparc from Midway, that was obviously a return, they sold as new. It had scratches on the front lens, a big gouge on the battery cover, and wear on the turret o rings, one was actually cut in half. You could also see tool marks on the hex key of one of the mounts, proving to me, that it was indeed mounted to someones weapon, returned, then sold to me. I called Midway, but decided to just send it in for warranty to Vortex , to avoid getting another return, or who knows what. Needless to say, I will never do business with midway again.
    Last edited by camoman; 10-26-12 at 00:48.

  9. #69
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    Quote Originally Posted by Taptaps View Post


    Adams Arms midlength upper on an LMT lower receiver.
    So far, this rifle has been perfect. It is light, less than 7 lbs - piston and all, and it loves to make nice, neat little groups with 70 grain otm ammo.
    I know there is a lot of hate for the piston designs around here. Part of the reason I mainly stick to my 1911forum. According to many here, AR's aren't meant to be anything other than DI, shoulda bought a rifle that is "supposed" to be piston driven, etc,. People get kinda nasty about it, telling others that they are wasting their money, stuff like that. I would have thought that with all the tinkerers minds on these forums, there would be more support for people who want to find out which piston system works best.
    Well, I think that the system on my rifle is exactly how my rifle is supposed be. It is not too heavy. I would have gotten a lighter barrel if that was a problem. More weight there than the piston adds. The midlength recoil impulse feels sweet and the rifle is as accurate as any other I have shot.

  10. #70
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    Quote Originally Posted by 40Arpent View Post
    We're talking about AR platforms here, and the SCAR is not an AR platform.

    The biggest problem with your argument is that the DI vs piston debate has raged ad nauseum here many, many times in the past. No sense in rehashing the same shit all over again.
    I guess that the Marine Corps is wrong as well since they are changing over to an H&K M27 with a gas piston system that passed all of their tests and has now deployed to Afghanistan with great success, and will now be their new battle rifle. Also the Army is conducting testing now for a possible M4 replacement and the ADCOR BEaR a gas piston rifle is tied with the #1 carbine and may be selected as the M4 replacement (the Army may scrap the program now with the budget problems) but I don't think the hardcore testing the Army and Marine Corps put these weapons systems through can be wrong so I guess that means your argument is fatally flawed from lack of knowledge or the entire ground fighting force of the United States Military is wrong and you are correct. Somehow I doubt that very much. Oh and the Special Operations Community has been using gas piston rifles for a long time, so once again I go with the Military and not you. Thanks, and I was in the Army for 15 years and I work at the base where this testing is happening.

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