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Fiddling with my 2250 in Thailand

Discussion in 'Gun Gallery' started by robsamui, Jan 1, 2014.

  1. robsamui

    robsamui Member

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    Location:
    Koh Samui, Thailand
    Hi everybody.

    New Year's day and I'm still fluffy, so in an attempt to get my brain working . . .

    It's overcast and 27 degrees and my guns are going rusty with the humidity again. So after cleaning, polishing and oiling, I thought I might offer one up to you.
    It started life as a standard 2250. There are a lot of skilled Thai guys over here and one of them is machining ally breeches which take the Marauder rifle 10-shot mag, with a shroud to match. So the first stage was simple enough and I stripped and polished the air tube to match. (I was planning on stripping down the Bug Buster to the bare silver, but after having spent an hour with a power sander and fine grit on just the lens shade - forget it!)The little muzzle break is a Crosman part - unbaffled, but it actually reduces the crack of the gun quite a bit. At this stage I was still on CO2 powerlets.
    [​IMG]

    Then things kind of piled up. A HiPAK with one extension, together with a B&A Boss valve. Plus I got a larger transfer port to match the exhaust port on the valve.
    Plus a really effective silencer from the same guy who makes the breech/shrouds. (This actually will screw directly into the shroud, but I didn't like the look of it.)
    Hmmm . . . .??
    [​IMG]

    The problem was that there was now a lot of barre/shroud/airtube in front of the transfer port. I drilled and tapped and enlarged the piddly little screw that sits in the breech under the magazine, but there was still noticeable play - the barrel could be rocked slightly and there was a leak from the transfer port. (See the top picture - you can see that the barrel isn't parallel to the airtube.) This was only partly solved by adding a Gmac upper O ring to the transfer port, so I scouted around and found another craftsman making brass bits, and he made a brass barrel band to my sketches. This effectively pressed the shroud down at the front end. He made 2 bands for me - one sitting on the shroud and the other on the barrel - I like the look of both together! (Or do you reckon it's too fussy?)While I was at it I ordered a brass trigger shoe from him, plus a brass-housed hammer spring adjuster with a 2,500 psi Gmac spring.

    In Thailand there's no restrictions on things like overall power or silencers, and without the valve spring being touched I seem to get the sweet spot at about 1,800 psi. This gives me a 15 shot string of between 710 and 670 fps with 14.3g Crosman Premiers - 14-15 FPE. After this the POI drops steadily but still gives another 7 or 8 good shots.
    [​IMG]

    The next stage is to do something about the horrible plastic stock. I quite like the idea of getting an upgraded trigger, and BlueFork does a nice one which will take an AR-style handgrip - black grip and the trigger group stripped down and polished silver.
    [​IMG] [​IMG]

    Then the last part is to hack the plastic stock about. I can't take the credit for this idea but it seems perfect. It still keeps the "Crosman" style but makes it far more functional, with an adjustable stock and cheek riser. Plus I've just got to do something about the silly little foregrip . . . maybe the Marauder pistol foregrip will fit - then I can add an air gauge, too. And then I reckon that'll be it. I'll post the final piccies when it's eventually finished!
    [​IMG][​IMG]
     
    Last edited: Jan 2, 2014
  2. ped

    ped Big Poster

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    looks good rob the breech looks well the blue fork trigger is a much better unit and greggs workmanship is very good
    ped
     
  3. The Robin

    The Robin Super Moderator Staff Member Mod/Admin

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    Location:
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    What a stunning set up you have there, bet your over the moon with it :up:
     
  4. robsamui

    robsamui Member

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    Location:
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    Yes - heard good things about these triggers. Thanks for the heads up.
     
  5. robsamui

    robsamui Member

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    Location:
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    Thanks - tho it has to be said that I haven't been using it much in the last month or so.

    Over here it's the closest we get to winter, meaning that things have stopped growing for a while and there's no fruit on the trees!
    I used to go out and shoot the squirrels and birds which were getting at one of the local farmer's fruit - but there's not much about right now and the weather is blustery
    I've got the gun set up with ChairGunPro so that the zero gives me a virtually flat trajectory between 14 yards and 40 yards, and I have to say that the gun is pleasingly accurate at that range. The extra power means that I get more range but it also also increases the hold-over unless the zero is optimised.

    Yes - I'm happy with it - the best single thing was the multi-shot breech - I won't ever be able to go back to loading single pellets now. But I'm hooked on modding - once you get the itch you just gotta keep fiddling!
     
    Last edited: Jan 1, 2014
  6. bolo2

    bolo2 Active Member

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    Looks like you put a lot of work in definitely payed off :up:
     
  7. droid

    droid Posting Addict

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    Nice work, you got a quite unique set up there.

    I love seeing what can be done to these rattys.
     
  8. robsamui

    robsamui Member

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    Location:
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    To follow on -

    am now in the process of upgrading trigger group (Bluefork) + AR grip, 2600 airtube, modded Disco valve, 0.111 transfer port, stronger adjustable trigger spring and there's a custom 16-inch barrel coming too.

    Right now it's shooting raw at over 800 fps with 14.3 Crosmans at 1,800 psi (just on 22FPE) - no idea yet what what the shot string is like.
    [​IMG]
    (Plus this valve/tube combination looks good for up to 3,000 psi also . .)

    But cranking the valve spring half way out shows 670 - 690 fps at 1,800psi, and all the way out is around 450 fps - looking really promising . . . from 450 to 800fps in half a dozen twists!

    But it's really loud at top whack - like a .22 blackpowder. I'm gonna need that suppressor!

    I'm having the modified 1399 stock made-up at the moment.
    Then all the metal exterior parts will be custom airbrush powder coated.

    What I want is to be able to keep it short - don't want a long gun, and all those 2240s with yard-long skinny barrels I think look really silly - like genetically damaged walking sticks.

    I reckon this will end up less than 20 inches long with the silencer and stock removed - just about perfect in length and a nice overall balance of looks.
    Projected image will look something like this -
    [​IMG]
    Reckon the final powdercoating is about a month away yet - I'll keep posting!

    R

    ps - I'd love to go down this path with my Prod, but no. The Marauder pistol holds it own at (big transfer port and new hammer spring) 670fps with 14.3 pellets. Messing with this bottoms the resale price right away. But a unique custom 22XX is a different story. (Plus it's MINE!)

    Next project? The 0.32 cal CO2 2240 at over 100 FPE with custom wood grips - 2 shots from a 12g CO2 powerlet.
    [​IMG]
    [​IMG]
     
    Last edited: Feb 24, 2014
  9. robsamui

    robsamui Member

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    Location:
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    ps - my mistake - the 0.32 cal CO2 2240 is around 80 FPE
     
  10. Squats

    Squats Engaging Member

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    I really like what you`ve done to the stock, it`s certainly got me thinking about my 1377/22 project.
     
  11. robsamui

    robsamui Member

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    Location:
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    The picture here is an 'artist impression'' - but I've suggested to the Thai guy who is making up the parts that he keeps the patterns for it all.
    I'll post the photos when it's finished. But it might be that in a few month's time I'll be offering the DIY kits to modify your own 1399 stock!
     

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