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Uk Crosman 1377 Now Restricted To 495 Fps!

Discussion in 'Air Pistols' started by Zeroexpo123, Nov 10, 2019.

  1. Zeroexpo123

    Zeroexpo123 Active Member

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    Hi Guys,

    I've just bought a brand new Crosman 1377 and noticed it's restricted to 495 FPS like the Canadian version. It's also Black with a different grip & pump compared to the older models which were Brown.

    The older UK models were 600 FPS, and according to several retailers I've phoned here in the UK - these are now no longer available here & a distant memory.

    Only the 495 FPS models are now available here as per the image below.

    Does anyone know what Crosman have done to restrict these, and is there a workaround to bring it up to 600FPS which is still well below the UK legal limit?

    As it stands, out of the box, this pistol will achieve only about 3.5 ft/ib at best, but I remember my older one doing around 5ft/ib in stock form.

    [​IMG]
    upload
     
  2. Spray1Mark

    Spray1Mark Very Active

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    That looks like a worldwide packaging variant to me and not just intended for the UK?
     
    Zeroexpo123 likes this.
  3. Zeroexpo123

    Zeroexpo123 Active Member

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    Whatever it is, I'm unimpressed with it.

    According to the stockists I've spoken to over here, this is all that's available here now. It seems to be the variant that Canada get, too. :(
     
  4. mikeyhall1

    mikeyhall1 2018 Forum Nice Guy - Pepe Le Pew

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    Quick search of UK stores there are loads stating 600fps and several with the brown grips listed.
     
    Blue BSA likes this.
  5. Spray1Mark

    Spray1Mark Very Active

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    Send it back and get a refund and buy one of those that Mikey says are availible.
     
  6. JoeH

    JoeH Engaging Member

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    The one I bought in the US a few years ago depends on how many pumps you give it: one for "storage" to protect the seals, three for 10 meter shooting, and up to ten for maximum power. Considering the low price, it is a very accurate gun, thanks to the adjustable sight. The .177 version max is 600. The .22 version 460.
     
  7. ped

    ped Posting Addict

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    it will have the restricted valve in that's all same as Canada gets
    UK ones always have had a blow by valve in 1322's originally had a square stem 1377's had a hole at the rear sometimes 180*s to the port
    later they just used the rear hole in the valve
    loads on line and on the crosman groups on how to fettle it
    you could just fit a ftp and valve and a 22xx hammer spring
    74472201_2391402294455818_2919375058767970304_o.jpg
     
    Zeroexpo123 and cloverleaf like this.
  8. Geezer

    Geezer Posting Addict

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    Have you chrono’d it? Most US market advertised velocity figures are more guess or marketing than science.

    I’d just note that 495 fps with a 10.6 grain .177” Bis Mag pellet = 5.77 ft-lbs.

    But, yes, given that the US model typically exceeds 6 ft-lbs, it would not surprise me if Crosman chose now to make one less powerful version for all the main restricted markets - Canada, UK, Germany, etc.
     
    Zeroexpo123 and ped like this.
  9. Tom A

    Tom A Busy Member

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    Don't they usually quote max FPS numbers using an ultralight lead-free pellet because bigger numbers are better?

    With a 5.2 grain RWS Hypermax (their usual go-to pellet for inflating FPS figures), 495fs gives you 2.83 ft lbs.

    Pellpax have the black 1377 on their website, and list it as approximately 4.5 ft lbs. This sound about right for playing it safe with the UK limit.
     
    Zeroexpo123 likes this.
  10. Geezer

    Geezer Posting Addict

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    Yes, usually. But a lot of the quoted figures still seem a bit back of fag packet.
     
    Zeroexpo123 likes this.
  11. Zeroexpo123

    Zeroexpo123 Active Member

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    I phoned several stores that still advertise them as 600fps, however, they told me they only stock the one that I have.

    I'll carry on searching around, though.
     
    mikeyhall1 likes this.
  12. Zeroexpo123

    Zeroexpo123 Active Member

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    I've seen these flat top valves/pistons around on Ebay & YouTube, amongst other valves that have had threads cut off & internal metal removed to increase air capacity.

    I'm thinking of buying one sometime but don't know which to go for.

    I think I've found some good information on upping the power of mine, and it entails filling the bleed hole you mention & also slightly altering the transfer port, etc'.

    If anyone has any more info' to add that might assist, please fire away.
     
  13. Zeroexpo123

    Zeroexpo123 Active Member

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    I got this one from Pellpax mate.
     
  14. Tom A

    Tom A Busy Member

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    4.5 ft-lbs gives you a velocity of approximately 495fps with a midweight .177 pellet. So it sounds about right for what you have.
     

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