What types of .40 ammo require the HI locking piece for the MP5 40?
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Thread: What types of .40 ammo require the HI locking piece for the MP5 40?

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    Default What types of .40 ammo require the HI locking piece for the MP5 40?

    (not 10mm), I was not able to find any chart for which types of ammo to use for the HI and LO Locking pieces for the MP5 40

    Anyone know what .40 S&W ammo types require the HI locking piece of the MP5 40?

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    Rule of thumb with the 40/10mm is to always start with high locking piece and see how the brass ejects. If the brass ejects like normal keep the high locking piece in. If the ejection is weak then switch too the low piece.
    Spent most of my tax return on Hk parts, booze and ammo....the rest I just wasted

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    Quote Originally Posted by Anopstyx View Post
    Rule of thumb with the 40/10mm is to always start with high locking piece and see how the brass ejects. If the brass ejects like normal keep the high locking piece in. If the ejection is weak then switch too the low piece.
    Yup. I’ve never taken my HI LP out of my 40, no issues.

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    What's a good ejection?

    On my 40 using the LO locking piece firing 180 gr factory Brazer and Maxtech I get a 3 to 4 ft ejection distance at 3 O'Clock

    Gold dot +P 5 ft at 3 o'clock

    Are those good distances and angles?

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    Three feet doesn’t sound like much, actually sounds not so good for any LP.

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    3-4 feet

    Yeah, I noticed it's kinda short too and I'm on the LO locking piece.

    Gold Dot +p only added about a foot or two

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    Quote Originally Posted by VX666 View Post
    3-4 feet

    Yeah, I noticed it's kinda short too and I'm on the LO locking piece.

    Gold Dot +p only added about a foot or two
    I am far from mechanically inclined. I wonder what other factors could be affecting the ejection? Clone build or German?
    Last edited by SudS; 10-09-2019 at 06:23 PM.

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    I thought that it was annything over 1000 fps needed the high locking piece.

    I load 180gr to 1260 fps, runs great with the high intensity locking piece.

    Annything below about 950 fps mine will not cycle correctly with the high intensity locking piece.

    With the low locking piece, mine will cycle 950 fps ammo.
    But annything over about 1100 fps I need to worry about getting roller marks when the bolt comes back too hard.

    But yours may be a little different.

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    @SudS it was a German

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