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  1. Muzza

    H&k UMP 45 HOP UP SWAP OUT

    I'm not happy with the build quality of the plastic hop up that you get standard with the UMP 45. I've seen a guy change his for a 5uk which is made for the H&K g36. Has anyone else done this or know of anyone who has? Cheers Muzza This guy does the same but with a Wii tech g36
  2. Muzza

    Not firing......

    Ive added the new outer barrel and silencer. The inner barrel & hop up parts have not been messed with, However the gun will not fire? ive tested it with old & new maggs but still not shots fired... There is air passing out the end, but the BB's dont seem to be taking?? I've then had...
  3. Muzza

    Inner barrel dimensions

    Just bought a metal barrel & silencer kit for the H&K UMP 45. Being so this has made it possible to fit a longer inner barrel. the Factory one is around 200mm, i'm looking for 300mm but im not sure on the width? Can anyone help with this. Some guy on youtube had a 6.01 tight bore but he...
  4. Muzza

    Hi all,

    New to this, Just got myself a starter kit, Which consists of a H&K UMP 45 Two tone, With a reflex sight , FWD grip. Uprated battery , uprated mags with dummy bullets. I was a bit annoyed with the fact the outer barrel is plastic. So i bought a metal outer barrel with a 8" silencer combo...
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