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Double feeding and loss of pressure

  • 01-02-2011 8:51pm
    #1
    Soberts
    Registered Users, Registered Users 2 Posts: 1,106 ✭✭✭


    I have taken my VFC SCAR appart about 16 times now at this stage, and i dont know what i can do differently.
    I took it appart to swap out the stock plastic bushings and plastic spring guide.
    I have put the gearbox back together, after shimming, and regreasing, setting the gear timing etc.
    The gun cycles fine but it double feeds, pellets drop about 5 meters from the barrel. I read that this could be a shimming problem so i have reshimmed about 10 times. This caused a few lock-ups.
    I even bought a new gearbox shell for it because i thought the other one may have gotten bent when i pushed in the new bearings, still no luck (and the new shell is 8mm so my 7mm bearings dont fit!! FML)
    Any ideas will be greatly appreciated.


Comments

  • #2
    thermo
    Registered Users, Registered Users 2 Posts: 13,440 ✭✭✭✭thermo


    did you look at the hop up rubber at all?


  • #3
    TNTQ
    Closed Accounts Posts: 1,968 ✭✭✭TNTQ


    Moving and or miss-aligned hop-up chamber could be your problem also.


  • #4
    Witcher
    Registered Users, Registered Users 2 Posts: 15,824 ✭✭✭✭Witcher


    Is the air nozzle sitting right on the tappet plate?

    Press the air nozzle in and it should spring back out if it is:)


  • #5
    Soberts
    Registered Users, Registered Users 2 Posts: 1,106 ✭✭✭Soberts


    Blay wrote: »
    Is the air nozzle sitting right on the tappet plate?

    Press the air nozzle in and it should spring back out if it is:)

    Yeah it is connected alright
    TNTQ wrote: »
    Moving and or miss-aligned hop-up chamber could be your problem also.
    thermo wrote: »
    did you look at the hop up rubber at all?

    Hop up looks 100% to me.
    Its like the air nozzle is not returning to its fully extended position or something. So i have lubed the rails which the tappet plate runs along and checked the spring tappet spring isnt catching.


  • #6
    Soberts
    Registered Users, Registered Users 2 Posts: 1,106 ✭✭✭Soberts


    TNTQ wrote: »
    Moving and or miss-aligned hop-up chamber could be your problem also.

    I rechecked the hop up chamber and the body screws on the side were stopping it from seating fully back onto the nozzle! It seems to be working fine now. Thank you, really appreciate it :D


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  • #7
    Firekitten
    Registered Users, Registered Users 2 Posts: 4,205 ✭✭✭Firekitten


    was about to say that! Most common reason for the double feeds and floppy bbs is mis seated hops, more common with newer designs where the unit can slide... g36s, aks, and scars deffinately \:P


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