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VSR Sears not engaging? (Picture heavy)

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  • VSR Sears not engaging? (Picture heavy)

    Hi again!

    I need a bit more help with my VSR.

    I've installed PDI sears both 1st and 2nd. But for whatever reason they won't engage. I have Laylax internals in the cylinder but I presume they are compatable as Zero One sells the upgraded package with PDI sears and Laylax.

    I've taken a few picture, so that anyone with a bit more knowlege than me can diagnose the problem.

    Here is everything together:



    From above the sears when the trigger assembly is together:




    Inside the assembly, I don't know if anything is missing or wrong?





    And finally the cylinder if that helps...




    Cheers in a advance for your help!

    I have a feeling that I haven't set up the mech properly or a spring is missing.
    Last edited by reb; 4th June, 2011, 10:55.

  • #2
    Re: VSR Sears not engaging? (Picture heavy)

    Just a thought but, it may not be the sears or the piston. VSR trigger mechanisms have a nasty habit of stripping the screws where they bolt to the reciever. The front screw is particularly notorious for this. Try tightening these screws as much as possible. Even a millimetre of movement can be enough for the sears not to engage. If the screws are stripped, you'll need to retap and fit new ones.

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    • #3
      Damn, that will be a bit of a pain. Though they have only been off once or twice.

      Does the inside of the mech look OK?
      It doesn't seem right to me, I can't work out how it actually works.

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      • #4
        Re: VSR Sears not engaging? (Picture heavy)

        which piston do you have?

        Comment


        • #5
          Re: VSR Sears not engaging? (Picture heavy)

          I bought a vsr that had the same problem, Im sure the guy thought it was knackered and was just going to give me the ''It was all ok when I had it'' banter. Turned out it was the adjustment for trigger pull and pressure, loosen them off a little see if that helps.

          Obviously with the screws wound in it stops the sear from catching the piston in its backward ''cocked'' position.
          Gun tech.

          AIRSOFTERS.........Load of Balls.!

          http://forums.zeroin.co.uk/showthrea...r-Offizier-M41

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          • #6
            Re: VSR Sears not engaging? (Picture heavy)

            The rear grub screw is the adjustment screw for trigger pull

            Undo it all the way so it makes the trigger have a lot of play

            As you have installed new sears you will need to re set the adjustment screw according to the piston used

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            • #7
              Re: VSR Sears not engaging? (Picture heavy)

              Thanks for the help guys. The piston I am using is the Laylax red high pressure one.

              I've had a go at tightening the screws holding the mech to the body, and the adjustment screws, but its made no difference. I've untightened the stroke all the way, and had a play with the other but it still doesnt engage, I can feel the spring compressing, it just won't lock.

              I don't know if you can see on the pictures but, the rear screw (stroke) doesnt actually have a spring, is it meant to?


              EDIT:

              Just had a look at the other side of the mech, and the sear looks like its not going all the way up as you can see by the silver pin:

              Last edited by reb; 4th June, 2011, 16:36.

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              • #8
                Re: VSR Sears not engaging? (Picture heavy)

                edit....does it work when its all together? Catches the piston then release when you pull the trigger?
                Gun tech.

                AIRSOFTERS.........Load of Balls.!

                http://forums.zeroin.co.uk/showthrea...r-Offizier-M41

                Comment


                • #9
                  Re: VSR Sears not engaging? (Picture heavy)

                  Nope, doesn't catch anything. When I pull it back, if I don't put it back to rest it springs back into the rifle. If that makes sense, slam firing I think its called.

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                  • #10
                    Sorry for the double post but I've just had a thought.

                    Does the piston have to be at a certain position as I just put it in any old way (it is the right way round).

                    Comment


                    • #11
                      Re: VSR Sears not engaging? (Picture heavy)

                      I had the same problem with this PSS10 high pressure piston, I replaced sears twice no joy, seems only laytax sears work and as they are not available piston is no good, so I am selling piston for half the price I purchased it for.
                      Mike

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                      • #12
                        Re: VSR Sears not engaging? (Picture heavy)

                        But if you have a look on the Zero One VSR Bundle they have the same piston with the PDI sears.

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                        • #13
                          Re: VSR Sears not engaging? (Picture heavy)

                          Sorry for the double post again...

                          I just put the stock spring and piston back in (spring guide is still Laylax and sears PDI) and it works. This makes me think maybe it is a compatibility thing. A real bugger as it probably means I'd have to change the spring/spring guide, piston and cylinder head?

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                          • #14
                            Re: VSR Sears not engaging? (Picture heavy)

                            I have PSS10 150 spring, PSS10 spring guide, PSS10 high pressure piston, stock cylinder and cylinder head. Changing the cylinder or head I can't see this improving the slam firing, evey forum I have asked this question in have said don't mix laylax and PDI internals, I have so they are right.

                            Mike

                            Comment


                            • #15
                              Re: VSR Sears not engaging? (Picture heavy)

                              The next question then is where to get a PDI piston as Zero One don't stock or sell them? and hope that the spring, spring guide and cylinder head are compatible.

                              Comment

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