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Thread: MK262 and maintenance

  1. #1
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    MK262 and maintenance

    If a person runs mostly MK262 rather than M855 or 193 is there increased wear or decreased parts life associated with the hotter ammo?

    The majority of my shooting is MK262 through a Colt LE6920.

  2. #2
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    How many rounds of it do you shoot through any particular gun in a Day/Week/Month/Year?

    Is your gas/recoil system tuned to this load in any gun you shoot it with?

    Do you regularly inspect and maintain your guns?



    I doubt you'll ever notice a marked difference, but you can always use quality parts, and fine tune your gas/recoil system for your particular load and have nothing but a benefit regardless.


    Here's a good read:
    http://www.shootingtimes.com/ammo/sp...-mod-1-review/
    Last edited by ColtSeavers; 10-07-17 at 12:56.

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    They are all 5.56 pressure ammo so I'm not sure there would be much difference.

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    I’ve never heard that 262 was any hotter than normal stuff.

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    The muzzle velocity of Mk262 is less than M193 so wouldn’t that result in a slightly longer barrel life?

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    Quote Originally Posted by 17K View Post
    If a person runs mostly MK262 rather than M855 or 193 is there increased wear or decreased parts life associated with the hotter ammo?

    The majority of my shooting is MK262 through a Colt LE6920.
    In a word, no.

    How much of it are you shooting, and are you shooting genuine Mk262 or an imitation?
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    My understanding regarding Mk 262 ammo was besides the grain weight... you can scroll down to the Mk 262 part and read the rest. Shoots bug holes for me. I've had good luck with FGMM 69s as well.



    https://en.wikipedia.org/wiki/5.56×45mm_NATO#Mk_262
    Last edited by Spin Drift; 10-07-17 at 19:55.

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    I mostly shoot IMI and CBC 7gr SMK loads. The guns I use are functionally stock 6920s with H2 buffers.

  9. #9
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    Quote Originally Posted by 17K View Post
    I mostly shoot IMI and CBC 7gr SMK loads. The guns I use are functionally stock 6920s with H2 buffers.
    Not Mk262 then.

    Short answer still no, but you'll have to check with those manufacturers and any testing to determine what pressures they might be running and resulting effects.
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  10. #10
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    Quote Originally Posted by 17K View Post
    If a person runs mostly MK262 rather than M855 or 193 is there increased wear or decreased parts life associated with the hotter ammo?

    The majority of my shooting is MK262 through a Colt LE6920.
    Yes, but as mentioned above probably not enough to matter. Lubrication, firing schedule, gas system tuning, and suppression probably affect it just as much if not more.

    Looking at my guns with a bore scope, the douglas 18" spr barrel ( EDIT: 1100 rounds, almost all suppressed, all 77gr heavy reloads) even under slow fire is taking more of a beating to the gas port than expected:


    This is a LaRue 16" lightweight barrel with 1400 rounds (much faster fire, 99% .223 pressure reloads) is doing better even though the port is 2" closer:


    Maybe not the most instructive comparison, as I do not know what LaRue's barrel steel is.
    Last edited by mgrs; 10-12-17 at 22:09.

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