MSG90 bolt carrier iwith fullauto bolt carrier
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Thread: MSG90 bolt carrier iwith fullauto bolt carrier

  1. #1
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    Default MSG90 bolt carrier iwith fullauto bolt carrier

    There are several questions on this forum on replacing the HK41/G3 semi-auto bolt carrier with an MSG90/PSG1 bolt carrier and the general consensus is that you can use the MSG90/PSG1 and semi-auto bolt carrier with a #9 40 degree locking piece.

    I just bought a pristine 1997 FMP G3 (but still haven´t received it) which has original FA bolt carrier without tungsten filling and a FA bolt head, with a semi-auto trigger.

    I'm thinking of replacing the original bolt carrier with an MSG90 bolt carrier because of the tungsten filling.

    Question: will the MSG90 work with the FA bolt head and original locking piece as a direct replacement? Does it also require replacing the locking piece with the #9?

    Thanks,

    Mike

  2. #2
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    Bolt heads aren't FA or SA. They're just bolt heads. I am not up on the locking piece issue. I imagine @hk21man can shed light on your question.
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    Thank you for your quick reply. If bolt heads are the same, I'll rephrase my original question:

    Question: will the MSG90 bolt carrier work with the original G3 locking piece, as a direct replacement in a standard G3 chassis (G3 receiver and G3 cocking tube)?

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    The MSG90 carrier takes a bigger recoil spring and rod more like the hk21. The 91/G3 spring and rod is smaller in diameter. Also the locking piece is different also. The shoulder at the rear is a smaller diameter than the 91/G3.
    Can someone else chime in on this. To say if I'm right or going crazy.

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    Quote Originally Posted by fasth2 View Post
    The MSG90 carrier takes a bigger recoil spring and rod more like the hk21. The 91/G3 spring and rod is smaller in diameter. Also the locking piece is different also. The shoulder at the rear is a smaller diameter than the 91/G3.
    Can someone else chime in on this. To say if I'm right or going crazy.
    Recoil spring and rod are the same as a G3/91 not larger like the 21.
    MM

  8. #7
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    Is there any safe way to use a MSG90 bolt carrier in a G3 receiver?

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