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Crosman 1322/ King rat/Backpacker hybrid.

Discussion in 'Anything Airgun Related' started by Honest Bob, Jan 26, 2014.

  1. Honest Bob

    Honest Bob Big Poster

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    I have an old King rat & a 1377 pistol, going to make a pump up rifle out of the two guns, but to make sure I stay within the law, and the pump tube is marked as a pistol, I wanted a Backpacker tube. Well got one on its way from the US, £16.82 ink postage, new. Emailed David Grimes at Alchemy Airwerks, top bloke. So if you want any Crosman parts, not normally available in the UK. I can recommend this guy. Hope this helps any other members, undertaking such a project. Will post some pictures, with crony and target results, when it is done. PS. Got sick of paying a fortune for Co2, pluss it does not like cold weather, so what I will end up with is a pump up King Raty.
     
    Last edited: Jan 26, 2014
  2. bobbie1

    bobbie1 Busy Member

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    Sounds very interesting Bob , stick some pic's up as you go ,
     
  3. doodsy

    doodsy Donator

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    yeh I too would be interested in what you come up with bob, keep us updated mate.

    atb


    doodsy
     
  4. Honest Bob

    Honest Bob Big Poster

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    Will do, all now in pieces, awaiting Backpacker tube, will be using the tune parts, from the Raty,may send for flat top piston and valve, from GMAC. have 24inch barrel, I put it on the Raty, but was not accurate, so took it off, after some research, 18 ins is the optimum length, according to some people on the Crosman forum, so may cut down the 24 inch.
     
    Last edited: Jan 26, 2014
  5. ped

    ped Keyboard Hero

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    david is a real top bloke and his web site has some very well made parts inc some nice hydrographic gripswhen you first posted about a king ratty 1377 hybrid it got me thinking of fitting a 1377 pump tube in place of the co2 bottle and using with a paintball reg a future progect i thinkwith the 14" barrel and a flat top set up you'll be around the limit on mine i had to bring it down a bit but i did do a bit of valve workif you go down the flat top route a solid pin is a good investment for adjusting the piston as is fitting an extra valve retaining screw and beefing up the front pivot plugif you get stuck on it i'm in leeds as well this is my version bottom one top ones based on a 760ped
     

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  6. droid

    droid Posting Addict

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    Another +1 from me about David, very helpful and knows his onions :up:
     
  7. Paul55

    Paul55 Posting Addict

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    Thanks Bob, he's on my fave list now :up:
     
  8. Honest Bob

    Honest Bob Big Poster

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    Thanks for that. I do like to try and improve things, The wife says I just like taking things to bits.
     
  9. bobbie1

    bobbie1 Busy Member

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    I wouldn't cut the barrel untill last thing , then shorten it a inch at a time ,
     
  10. Honest Bob

    Honest Bob Big Poster

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    I will fit the 14 inch first, then do the tests, I would like to keep it as compact as possible. It will have my HW mod on it, so would look stupid if too long. Bob PS. Did a trial run, using the 1377 tube, got some good results with the 14 inch. A photo of my trial setup. 100_0692.jpg
     
    Last edited: Jan 26, 2014
  11. ped

    ped Keyboard Hero

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    14" is more than adequate both mine in the pic have 14" barrels and are set at 11 and a bit at 12 pumps
    ped
     
  12. Honest Bob

    Honest Bob Big Poster

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    Confused. Some people say you get more power, with a flat top set up, as I see it, you would get same power, but with less pumping. Bob.
     
  13. ped

    ped Keyboard Hero

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    flat top set up is more efficent bob so reduces the ammount of pumps needed but they do need to be adjusted correctly and can cause more heat build up and stress on other parts
    ped
     
  14. Honest Bob

    Honest Bob Big Poster

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    UPDATE. Decided to use The 24inch barrel, now cut down to 19 inch, extended probe and metal breach, heavy hammer spring and guide from the King rat + plastic port seal, now getting just over 10 foot pounds, ordering a flat top valve kit, so less pumps required, May have to do some valve work, as at the moment the stock valve will not dump all its air, will be happy if I can get 11 foot pounds out of it, without too much pumping, as most of my shots are taken at around 25mtrs, more than happy with the accuracy so far. Will post the final results, with pictures when its done. PS. Has anyone had a flat top valve from GMAC, if so are they ok. Bob.
     
    Last edited: Jan 29, 2014
  15. ped

    ped Keyboard Hero

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    if the valve is retaining air you need a heavier hammer strike for the valve in it current state of tune if you can get one try a early rear cocking hammer as they're heavier
    how many pumps before it starts holding air
    ped
     
  16. Honest Bob

    Honest Bob Big Poster

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    I noticed that the stock valve port is slightly restricted, when I strip it again, to fit a flat top. I am going to work the stock valve port, open it up and angle it for better air flow + a weaker valve spring, if this improves things, I will do the same to the flat top, if required, if I pump it 20 times with the stock valve, it retains a small amount of air, I do know that 20 pumps is not recommended. I may send for a new hollow probe, as i broke the old one from the King rat. Bob.
     
    Last edited: Jan 29, 2014
  17. ped

    ped Keyboard Hero

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    mine start holding air at 10 pumps bob std 1377 spring with a new end cap drilled 1mm deeper than a standard one to reduce preload and the other is a rear cocker so you can see the benefits of a flat top set up
    are you using a brass valve or an aluminium one as the valve springs and check valves are different increasing valve volume will help you
    as will angling the port to 20*
    ped
     
  18. Honest Bob

    Honest Bob Big Poster

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    Thanks for the advice. I have a flat top kit + hollow probe on order, will fit them first, then test to see if any valve and port work required, going to leave the stock valve as is, I can flat top it as a spare. Got the gun looking and shooting well. I started to go overboard with a big lump of glass on top, tripod etc etc, then said to my self stop, as the whole idea was to have a practical gun that I could use for med range pest control, so took off all the bling. Fitted a Hawke 3-9 by 20 scope & HW mod, it is now 42 ins long, 8 ins of that is the mod, and the weight is just under 4lb. Bob.
     
    Last edited: Jan 31, 2014
  19. Honest Bob

    Honest Bob Big Poster

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    Is it OK to use silicone lube, when replacing the piston and valve. ie the stuff plumbers use to fit plastic pipes together. Or would pelgun oil be better. Thanks. Bob.
     
    Last edited: Feb 1, 2014
  20. mattyts

    mattyts Donator

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