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Thread: Ptr91 Full Auto Bolt Question

  1. #1
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    Default Ptr91 Full Auto Bolt Question

    Will a ptr91 function with a factory semi auto trigger group but using a full auto bolt and carrier? Thank You!

  2. #2
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    Quote Originally Posted by spicoli View Post
    Will a ptr91 function with a factory semi auto trigger group but using a full auto bolt and carrier? Thank You!
    Yes.

    The only difference between the FA and SA carrier is that the FA carrier has a ramped lip which engages the trip lever of the FA pack. The semi pack has no trip lever so the ramped lip on the carrier never makes contact with anything at all. Nor does it matter.

    The reverse combination is not functional though. If you have a SA carrier with a FA pack, the part of the carrier that would engage the trip lever is machined out so it never pushes the trip lever now. As such, the sear catch doesn't get pushed forward to release the hammer. So the hammer can not fire the gun.
    Last edited by retrodog; 02-26-2009 at 05:12 PM.
    "Sometimes change sucks."- Anne Frank

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    And a sear pack or FA trigger group will NOT function with a semi carrier.

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    Quote Originally Posted by retrodog View Post
    Nor does it mater.
    It don't mater? Oh.. right... Texas.

    Youse guys get yer 'maters in the ground way before us Northern zone dirt farmers do... :D:D
    45acp... turning human garbage into useful fertilizer since 1911

    Auf gebeginning to fixin der gun mit grosse busen of der schpritzin lubrication allen over derfukin platz, mit das squirtin and squeezin oil in allen fukinholes.
    Ja, und racken und strokin das bolt as if gecrazygoing, yanken dat handle bak und forth, zwei hunnert times, ja?
    Ist neue, und its needing some brekkin in.
    Zo, BREKKIN ZEFUKIN THING IN!


    Certified MM leghumper...

  5. #5
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    Besides carriers, are the semi bolt and the full auto bolt the same?

  6. #6
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    Quote Originally Posted by spicoli View Post
    Besides carriers, are the semi bolt and the full auto bolt the same?
    Yup. Same rollers, locking piece, yada yada yada...

    I have Rhinemetall carriers for all my PTRs. By default they're all FA unless someone comes and mills that little groove, but never had a problem with the SA FCGs. If only I had the right FCG to pair them with. :( Maybe one of these days when I'm rich, I'll get one of those cool registered-sear FCGs. ;)

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    Quote Originally Posted by Shattered Mind View Post
    It don't mater? Oh.. right... Texas.

    Youse guys get yer 'maters in the ground way before us Northern zone dirt farmers do... :D:D
    Damn skippy.

  8. #8
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    Do I need to get a pinned and clipped SEF lower to use a sear pack, or will it drop into the factory ptr one? Thanks for all your help guys!

  9. #9
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    Quote Originally Posted by spicoli View Post
    Do I need to get a pinned and clipped SEF lower to use a sear pack, or will it drop into the factory ptr one? Thanks for all your help guys!
    The new PTR-91 comes with a plastic lower grip. I haven't tried my sear pack in it yet but see no reason why it wouldn't work.

    Just to note, I use the metal lower on my V51P to house the sear pack when I use it on that gun. It fits better than either of my HK91 lowers do.

  10. #10
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    Quote Originally Posted by retrodog View Post
    I use the metal lower on my V51P to house the sear pack when I use it on that gun. It fits better than either of my HK91 lowers do.

    Yepper... rule of thumb. Use the lower that came with the gun... it usually fits.

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