MP5 brass has fluting marks on it
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Thread: MP5 brass has fluting marks on it

  1. #1
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    Default MP5 brass has fluting marks on it

    I bought a new MP5 and was shooting it today. First 100 rounds smooth and wonderful then about 20 rounds into the second 100 and the weapon stopped.
    I grabbed the charging handle and nothing...it was stuck very very tightly about 1” from full forward position.

    I got a small diameter delrin rod and was able to stick it between the bolt and receiver and it took a lot of force to get the bolt to retract rearwards. The casing came out and had DEEP fluting marks.....

    I am a newbie but I racked the CH a few times out in a fresh 30 round mag and dumped it without issue and had no farther issues. I just wanted to run this by folks familiar with the platform and get some opinions.
    Attached Thumbnails Attached Thumbnails MP5 brass has fluting marks on it-fdea7df9-e8f5-45db-84f9-fcbbf250322c_1531445709189.jpeg   MP5 brass has fluting marks on it-98ec7a51-371a-4f66-973a-809f7fe69a64_1531445721856.jpeg   MP5 brass has fluting marks on it-ba3f21d3-93c8-4916-a302-252f58c1e372_1531445735431.jpeg  

  2. #2
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    Roller locks = tiger stripes. Always.

    I'd switch ammo.

    DG
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    Wow that is deeper than riflings on a bullet. Can you physically feel the marks? Mine are usually just powder marks, not indentations into the brass.

    Who made the BBL? Who made the ammo?

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  5. #4
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    It is a brand new POF.

    You can feel them alright, look at the leading edge where the projectile sits the brass took on the shape of the chamber...this was only one out of 250 rounds but like I said the damn thing was seriously stuck partially in the chamber.

    It was Perfecta 9mm. Cheap stuff

  6. #5
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    A few more pics....deep fluting! Must have been an overpressure round.
    Attached Thumbnails Attached Thumbnails MP5 brass has fluting marks on it-e1cba05d-d357-49ae-9e3b-852647c6e202_1531448237108.jpeg   MP5 brass has fluting marks on it-bcff82a7-6779-4f51-8a39-e64e1fd7284f_1531448245799.jpeg   MP5 brass has fluting marks on it-e329c8bc-f32f-4149-96fc-7501212fb32e_1531448253361.jpeg  

  7. #6
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    Quote Originally Posted by Conelrad View Post
    Roller locks = tiger stripes. Always.

    I'd switch ammo.

    DG

    Thanks I was hoping for a response saying something like hey moron quit buying cheap ammo! Thanks!

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    Folks on the board are not that critical... but Ditto's on using better/quality ammo. Stay away from Winchester white box and other "bargain" ammo. Pay more but you have a better range experience. Congrats on the purchase and give us a Range Report when you use different ammo.

  9. #8
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    I think it must have been overpressure. Primer looks cratered to my eyes.

    Might have been as hot/hotter than a proof round. Or potentially something else could have caused excess pressure, like the bullet too deeply seated in the casing.
    Last edited by FergusandCo; 07-13-2018 at 03:41 AM.
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  10. #9
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    Welcome to the site, and congratulations on the acquisition!!!
    100+ Octane in a Ferrari (HK or clone).

    Tony

  11. #10
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    I had great luck with perfecta ammo when I picked up several thousand rounds at Wally World on clearance. I'd agree with the above posts though. That one looks like it was HOT!

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