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Thread: QB79 butt stock

  1. #1
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    Default QB79 butt stock

    DIY rear stock for my ever evolving QB79 air rifle.

    I've decided to move the 9oz tank to the rear of the rifle, for a better weight distribution. Going for an AR15 style tactical look, work in progress.

    I heated a short length of PVC pipe (in the oven) then moulded it around the 9oz tank. (2 plywood offcuts and a G clamp held it in shape until it cools)



    I band sawed some plywood for the rear section.



    I still have to plumb the rear gas block and reroute it to the front. I plan on using brake line to connect the rear gas block to the new front gas block.



    Going to add a chopped up flipflop to the rear as a recoil pad. Bought a pair of cheap size 13 black flipflops for this.



    More to come as the project progresses.
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  2. #2
    REP: WS Airguns

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    Good idea that! Been thinking in that direction myself just have not been able to get to it.
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  3. #3
    REP: WS Airguns

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    What's up? Any further progress?
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  4. #4
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    Yes, I managed to plumd the gas block up. Did a few test shots... feels good and balanced.
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  5. #5
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    I used a short length of brake line to connect the rear gas block to part I made for the front.


    I used my remote line to safely pressurize the assembled parts. Checked for any leaks, success! !! No leaks. I made a little no return valve in the front gas block ( used a cap srew that was ground flat on one side with a small o-ring behind it) gives me the choice of shooting 2-3 shoots after the gas bottle is removed.


    I still need to complete the stock


    my scope cam/ night vision setup, also diy


    I place my old paintball marker pistol grip over the QB 79 to give some idea of what the finished build will look like

    Forestock will be ala AirForce Talon ( might try my hand at making a AirForce talon Maddog style stock)
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  6. #6
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    I like look and proportions of this style of stock. Almost bullpup like.

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  7. #7
    REP: Xtreme Airguns

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    Niccccce! Following with anticipation
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  8. #8
    MOT: Thomson Pneumatic Rifles

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    Well done, looking good. A stock like the pic above will finish that off nicely and could be made to conceal the lower tube. Maybe ask Ulrich if he could make one for you.
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  9. #9
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    The versatility of PVC....lol

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  10. #10
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    Dremel ; heatgun and 40 minutes of measuring and cutting. Not the finished build , just temporary fix so that I can plink a bit.

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  11. #11
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    I've also decided to shorten the barrel and to change the transfer port (I want to experiment with multiple hole around the diameter of the barrel, instead of I big hole. 6 x 3.5 mm hole evenly spaced around the od of the barrel, with a groove 4.5 mm right around connecting the holes) . I don't know it it'll work, but I'm willing to sacrifice a portion of my barrel to find out, since I'm going to shorten it anyway.

    A ruff sketch of what I'm trying to describe , hope it helps.



    Maybe someone can help me choose a good wood for my first attempt at stock making, any help will be greatly appreciated. Thanks.

    sketch of my proposed stock.


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  12. #12
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    With the bipod attached



    The front plug with non return valve

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  13. #13
    REP: WS Airguns

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    Looks good, I likes
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  14. #14
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    Thanks Wimpie
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  15. #15
    MOT: Thomson Pneumatic Rifles

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    Looking good. The multiple port idea is used in a commercial rifle, can't remember which? I think it may work well with Co2, keen to see your results.
    [emoji3] yes PVC is quite versatile, I have seen many bow builds, but this is the first rifle stock I've seen [emoji106]
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