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Thread: Old style recoil assembly vs new style assembly

  1. #1

    Default Old style recoil assembly vs new style assembly

    What is the difference in the Old vs New style recoil assembly for the PM9 and PM40? Is the MK40 a old style recoil assembly???

  2. #2
    Join Date
    Aug 2016


    There's a type 1, type 2, and type 3 recoil assembly for the PM series. The 9 and 40 caliber are the same assemblies.

    There are 2 types of slides for the PM series. One is the older blunt nose style, and the other is the new style with a taper on the front. Sorta looks like the CM slide up front.

    The old style slides take a 13 coil outer spring. The new (slightly longer) slides take a 15 coil spring.

    Kahr sent me a 15 coil spring with my Type 1 recoil assembly, and it worked awful until I cut 2 coils off the spring. Slide wouldn't lock back at all with the long spring.

    The type 1 & 2 recoil assemblies differ in the size of the rear flange (3/8" vs 1/2").

    PM recoil assemblies use an uncaptured outer recoil spring. MK recoil assemblies use a captured outer spring. Different system, and NOT interchangeable with PM assemblies.

    Here's a picture of the 3 types of PM assemblies, but it's tiny, and tough to see....

    Attached Images Attached Images

  3. #3
    Join Date
    Aug 2017


    Very Informative post Ed. I looked for a while for this information when I found a P9 slide and barrel on gunbroker. I almost bought it to put on my CW9 frame but after digging on the forum a while found it was the old flat nose type and used different recoil spring assembly.

    Again very nice to have this info on the forum. Thank you!
    Kahr MK9, Kahr CW9, Kahr P380, Kel-Tec P-3AT, Glock 17 gen 4, Sarsilmaz B6PC

    "People demand freedom of speech as a compensation for the freedom of thought which they seldom use."

  4. #4
    Join Date
    Sep 2009
    Wet & Wild Pacific NW


    You'd just have to shorten the spring a coil or two and it would work. As I recall it's just long enough it won't work without shortening tiny bit.!
    In Memory of Paul "Dietrich" Stines.
    Dad: Say something nice to your cousin Shirley
    Dietrich: For a fat girl you sure don't sweat much.
    Cue sound of Head slap.

    RIP Muggsy & TMan

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