circles on inside of slide of hk45 and brass shavings in vp9sk
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Thread: circles on inside of slide of hk45 and brass shavings in vp9sk

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    Default circles on inside of slide of hk45 and brass shavings in vp9sk

    I have recently noticed circular indentations on the inside of my slide on hk45. Im guessing it is from the bullet loading as the slide comes back but want to make sure its normal. Also noticed a lot of brass shavings in my vp9sk. Guessing this is from some cheap ammo but some reassurance would be appreciatedcircles on inside of slide of hk45 and brass shavings in vp9sk-kimg0370.jpgcircles on inside of slide of hk45 and brass shavings in vp9sk-kimg0369.jpg

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    Pretty sure those circles are just machining marks

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    Howdy,

    Those are marks from the milling head that cut out that surface.

    As that is not a fine working surface, they use a rougher bit to finish it, which leaves extremely fine marks on the surface that you see there. It's much more efficient than working that surface completely smooth.

    Theoretically, all milled steel will portray some kind of pattern or marks from tooling (swirls, grain, lines, etc). If they are working surfaces, they are polished and finished as necessary.

    circles on inside of slide of hk45 and brass shavings in vp9sk-millingmarks.jpg

    Slav

    PS: Brass shavings are a perfectly to-be-expected phenomenon of modern brass loaded ammunition. These shavings will not damage your firearm; everyone has them. More than likely, however, these are bits of spent or unspent powder residue that take on a copper-ish tone. Very common to non corrosive gunpowder.
    Last edited by Roller Slav; 08-04-2020 at 09:12 PM.
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    Rest easy. It’s normal.


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    Wow! I noticed that too with my VP9 2020. In fact I will go on record and say out of my 11 HK’s that is only pistol I experience that with and makes a mess.

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    Welcome to the Forum Reid24202
    To me it looks like normal milling marks
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    Quote Originally Posted by Reid24202 View Post
    I have recently noticed circular indentations on the inside of my slide on hk45. Im guessing it is from the bullet loading as the slide comes back but want to make sure its normal. Also noticed a lot of brass shavings in my vp9sk. Guessing this is from some cheap ammo but some reassurance would be appreciatedClick image for larger version. 

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    Tooling marks. I'm curious though, how would you propose that a bullet comes in contact with that part of the slide during the loading process?
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    Those “brass shavings” might also be bits of powder residue. I see this with WIN NATO ammo quite often. It’s perfectly normal.
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    Quote Originally Posted by Hasbeen View Post
    Tooling marks. I'm curious though, how would you propose that a bullet comes in contact with that part of the slide during the loading process?
    Those marks are completely normal as stated above. I'm also wondering how the OP would think that this was from the bullet or brass casing. with any basic understanding of how the gun works one would know that this is not possible.
    ca survivor likes this.

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    Quote Originally Posted by Archer1440 View Post
    Those “brass shavings” might also be bits of powder residue. I see this with WIN NATO ammo quite often. It’s perfectly normal.
    I think you're on to something! The bullets I was using when my Vp9 made a mess was Winchester NATO 124 Grain!

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