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Thread: LMT MRP piston Cam Pin Wear? - Pics

  1. #31
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    Quote Originally Posted by rifle_eyes View Post
    You have AKs/1911s/garands, why should this gun be any different?
    All of which require parts replacement, two of which can require those parts to be fitted.

    Plenty of cam pins in DI guns have gone 10-15k without replacement....

    Your Glock 19 will require parts around the same time frame too. You can choose to not do that and eventually shorten the functional lifespan of the weapon...which you can do with your MRP too.

  2. #32
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    Quote Originally Posted by rifle_eyes View Post
    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?
    You are showing an alarming lack of understanding of mechanical devices. Do you never change your brakes on your car?

  3. #33
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    You have AKs/1911s/garands,
    I don't know much about AK, how maintenance intensive they are but 1911s and Garands will not go tens of thousands of rounds without attention and parts and they require the intervention of a skilled gunsmith, not a hobbyist. The 1911 is known for broken mainsprings, links and troublesome extractors. The M1 is known for bent operating rods. For the most part the hobbyist can maintain an AR. I looked at my LMT piston gun and the cam pin shows the same wear. It appears to me that it is wearing in, not wearing out as I see metal displaced but not removed. I'm going to keep mine clean and lubed and keep an eye on it. If it needs to be replaced, I will replace it.

    Looking at at more closely, it is evident that the pin is not galling or being abraded which is good. Usually when a machine part experiences plastic deformation as the cam pin here is it is bad and will lead inevitably to failure. Not always though. Sometimes and this may be a case, the metal will work harden and the contact area will increase, reducing stress until an equilibrium is reached and there is no more deformation. This is occasionally done by design but plastic design is very sophisticated engineering and to be avoided unless a compelling reason exists.

    Bear in mind that a DI gun does not have an unlimited life. Bolts break, extractors fail to extract.

  4. #34
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    If I had a problem or question regarding (questionable) excessive parts wear I would call the manufacturer. I have consistently read positive reviews about LMT products and customer service. That is the reason why I bought a MRP (should be here next week). To the OP, I would ask LMT about that cam pin & then post results. Good luck.

  5. #35
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    Sorry, I tried to answer this a few times last night but the forum was all screwed up. Anyway, I am speachless that no one actually answered your question.

    I am no professional so you should always go ahead and do additional research:

    I have had bolts do the same exact thing as yours. This is the part of the bolt which locks and unlocks the lugs in to the chamber, therefore its constantly being slammed inside the bolt carrier group against the hard and sharp edges. Thats what is causing this deformation in the metal. In my experiance its perfectly normal, however, I replace the cam pin when it shows about that much wear. Its probably not terribly necessary, however, the better shape you keep your rifle in, the longer it will last.

    I would call LMTand try to get a cam pin sent to you. If not, I bet you can get a LMT cam pin for around 10$. No need to get a new bolt.

  6. #36
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    Quote Originally Posted by rifle_eyes View Post
    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?
    This logic doesnt really make sense. Your lifetime with a gun could consist of 1000 rds and then yea you would be g2g with "whats in it." But if you're running a gun hard and often: parts will wear and eventually break. But you should be replacing them before they break. Hence - preventative maintenance.

  7. #37
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    Quote Originally Posted by rifle_eyes View Post
    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?
    This logic doesnt really make sense. Your lifetime with a gun could consist of 1000 rds and then yea you would be g2g with "whats in it." But if you're running a gun hard and often: parts will wear and eventually break. But you should be replacing them before they break. Hence - preventative maintenance.

  8. #38
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    Quote Originally Posted by rifle_eyes View Post
    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?
    I'm sure your rifle is fine and I would heed what the subject matters experts and senior members of this forum have stated about your weapon. It's LMT, so if there is any issue that you feel you have with it, you can contact them and I'm sure they will address it. LMT is an extremely reputable company.

    Firearms are mechanical systems, and like all mechanical systems it requires scheduled maintenance to be conducted on it to ensure that it operates correctly every time you pull the trigger. Glocks, Garands, and AKs need scheduled maintenance, as well, to ensure maximum reliability - failure to do so increases the risk of failure at an inopportune time. You're simply wrong if you think otherwise.

    If you're unhappy with your LMT, or even just the upper receiver, send me an e-mail and I'll negotiate purchasing it from you.

    Oh, and if you're looking at buying a WASR, you're probably going to be plagued with all kinds of problems, as well.

  9. #39
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    Quote Originally Posted by rifle_eyes View Post
    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?
    I'm sure your rifle is fine and I would heed what the subject matters experts and senior members of this forum have stated about your weapon. It's LMT, so if there is any issue that you feel you have with it, you can contact them and I'm sure they will address it. LMT is an extremely reputable company.

    Firearms are mechanical systems, and like all mechanical systems it requires scheduled maintenance to be conducted on it to ensure that it operates correctly every time you pull the trigger. Glocks, Garands, and AKs need scheduled maintenance, as well, to ensure maximum reliability - failure to do so increases the risk of failure at an inopportune time. You're simply wrong if you think otherwise.

    If you're unhappy with your LMT, or even just the upper receiver, send me an e-mail and I'll negotiate purchasing it from you.

    Oh, and if you're looking at buying a WASR, you're probably going to be plagued with all kinds of problems, as well.

  10. #40
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    Quote Originally Posted by rifle_eyes View Post
    so you're saying just keep wearing the gun out more?
    I am sorry for not being clearer.

    As others said, the cam pin is a wearable item. The LMT enhanced bolt carrier produces a different wear pattern on it than other bolt carriers. While this wear pattern is slightly more pronounced than other bolt carriers it is not an issue.

    Quote Originally Posted by rifle_eyes View Post
    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?
    Really?

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