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Thread: LMT MRP piston Cam Pin Wear? - Pics

  1. #11
    Dano5326 Guest
    As you are clearly not familiar with the parts or function of your carbine, I suggest a recalibration before asking about a "known problem".. inferring issues with LMT's products.

    Cam pin is a bearing surface, when metal on metal force is transmitted, it will show surface wear.

    Surfaces wear spots are where one should grease/lube

    Is there a functional problem?

    Piston MRP's should have a H2 buffer and a reputable recoil spring. How is your lower configured?



    If a DI MRP barrel is purchased, a regular bolt group is used.
    Last edited by Dano5326; 09-18-10 at 10:05.

  2. #12
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    I cleaned up the title some to help you out.

    If you can clean the oil and debris off, set your camera to "macro" and get some better pics, we could see the wear more easily.

    More than likely it will wear to a certain point and then stop.
    Employee of colonialshooting.com

  3. #13
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    This is an excellent example of why you do not ask a gun store about what to buy. Research it first and gather information from other sources.

    An AK47 was designed from the ground up to use a piston, AR platform weapon were not. There are many differences between the two.

    If you get a DI gun, lubricate it and maintain it correctly you woill not have any problems whatsoever.

    I also suggest you spend some time reading about the AR as well as the operators manual.

    Quote Originally Posted by rifle_eyes View Post
    so you're saying just keep wearing the gun out more? like I haven't had any malfunctions out of any of my shots all of them that i've shot, but the wear worried me, they look pretty deep, but i dunno. you can barely tell by moving your thumb over them, but def some difference in surface. I contacted LMT and they told me it was normal wear and all the piston rifles did that, which didn't really make sense. does this mean that I'm going to have to replace parts on it all the time just because it's a piston rifle? I bought the rifle on impulse not knowing much about the ar15 platform, mostly just shooting 10/22s and my glock 19, but the local gun dealer that I went to which is Clyde armory (https://policeguns.com/catalog/) he sold me into the piston mentioning how it had the same function as the ak47, so basically the same reliability, plus my BCG would be a lot cleaner and cooler & all of this sounded wonderful to me being a noob, not realizing it seems like a gimmick and is only eating away at my rifle, which I spent a little more on because I wanted a solid AR rifle that would last and had a reputation.
    Last edited by Iraqgunz; 09-18-10 at 13:48.



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  4. #14
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    While I can't be of much help to the OP, I figured I'd play with fire a little bit and say this.

    It seems like the OP is being scrutinized a bit much, for this site. If this sort of trial-by-fire for a new guy was on ARFCom, I could understand since it's ARFCom afterall, but here? Come on, guys. I come to this site because the posters are by and large more mature and less likely to chew someone and spit them out. Maybe I'm just reading into some of the responses in a different light than they were meant to be, but they seemed to come across a little harsh to me.

  5. #15
    Dano5326 Guest
    if you expect spoon-fed, non-justified, ignorant, back-slappery... probably the wrong forum to

    I expect discerning interaction in places I frequent.. or I don't.

    The reality of the www is that there is frequent "viral" advertising & unfortunately detraction campaigns from less than ethical parties. If one purports a "problem" with an established and well recognized product... stand by clearly articulate & justify your words

  6. #16
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    Its normal my LMT's cam pin looks like that. I will say It took about 1500 rounds through my DI with enhanced LMT BCG to get to that point. The cam pins need to replaced for good PM any ways.
    To the OP I would use it but I would keep an eye on it if it keeps getting worse replace it. Other than that just replace it at normal intervals every 3-5k for good PM.

  7. #17
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    Quote Originally Posted by Frank207 View Post
    Not being sure how your bolt is set up.

    By removing the gas rings on your bolt and replacing with a bolt spring is suppose to help/stop cam pin wear.



    good luck
    When your aftermarket operating system needs a third party upgrade something not right.

  8. #18
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    Quote Originally Posted by Thomas M-4 View Post
    Its normal my LMT's cam pin looks like that. I will say It took about 1500 rounds through my DI with enhanced LMT BCG to get to that point. The cam pins need to replaced for good PM any ways.
    To the OP I would use it but I would keep an eye on it if it keeps getting worse replace it. Other than that just replace it at normal intervals every 3-5k for good PM.
    Spend money for new parts ever 3-5 rnds? I don't think that sounds very good. I bought the LMT in the first place hoping I wouldn't have to replace anything and that it would be a rifle to lasts, guess not. If I'm going to have to keep putting money into this thing for it to work then it's not something I want. I'll probably trade it in and get a nice WASR ak47 and a glock 19 and be done with it. I'm not a plinker anyway, I just want a rifle/handgun for survival/defense purposes.

  9. #19
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    Quote Originally Posted by rifle_eyes View Post
    Spend money for new parts ever 3-5 rnds? I don't think that sounds very good. I bought the LMT in the first place hoping I wouldn't have to replace anything and that it would be a rifle to lasts, guess not. If I'm going to have to keep putting money into this thing for it to work then it's not something I want. I'll probably trade it in and get a nice WASR ak47 and a glock 19 and be done with it. I'm not a plinker anyway, I just want a rifle/handgun for survival/defense purposes.
    K stand for thousand every 3000-5000 rounds. The buffer spring life is normally 3000 rounds give or take. If you want a rifle with the least PM requirements designed for any retard to run then the AK would be it.

  10. #20
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    Quote Originally Posted by Thomas M-4 View Post
    K stand for thousand every 3000-5000 rounds. The buffer spring life is normally 3000 rounds give or take. If you want a rifle with the least PM requirements designed for any retard to run then the AK would be it.
    Yes, I know it was every 3000-5000 rnds, I know what "k" stands for. I also know that you shouldn't have to replace weapon parts every "xx-xx" rnds. A weapon should last a life time with what's in it. You have AKs/1911s/garands, why should this gun be any different?

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