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Smk Pr900w?

Discussion in 'Technical' started by Pietro Beretta, Jun 20, 2020.

  1. Pietro Beretta

    Pietro Beretta Posting Addict

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    Is the barrel threaded for a moderator, under the barrel end shroud?
     
  2. N.Vodden

    N.Vodden Busy Member

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    No sadly not. After you undo the grub screw to remove the shroud/foresight it slides off to reveal a thinner smooth barrel section.

    It's 10mm though and any of the mods/adapters for the S400 fit. I used to have one and had a Deben Whisper silencer on it which comes with a 10mm S400 adapter, fit perfectly.

    pr900w silencer 2.jpg
     
    Wing Commander likes this.
  3. Pietro Beretta

    Pietro Beretta Posting Addict

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    So, will the S400 adaptor fit standard 1/2" UNF moderators, or only the Deben Whisper?
     
  4. N.Vodden

    N.Vodden Busy Member

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    The Whisper came with several end caps for the end of the moderator - conventional 1/2" threading, S400 10mm with a grub screw fitting etc.

    To use a standard threaded moderator you will need a threaded adapter. I had one of THESE type on my CP1 at one point and it fits the PR900w barrel also.
     
  5. Pietro Beretta

    Pietro Beretta Posting Addict

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    So I just remove the existing shroud, slip that one, and fasten it with the grub screw, then thread on whichever 1/2" UNF moderator I fancy?

    Thanks. :up:
     
  6. N.Vodden

    N.Vodden Busy Member

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    Spot on :)
     
  7. Pietro Beretta

    Pietro Beretta Posting Addict

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    Seems JSR does the adaptors in a variety of barrel diameters, including 14.5mm, which may just solve the problem, of fitting a moderator to my XT501.

    I'll be ordering one shortly, when I've persuaded the existing shroud to come off. :)

    ETA: The XT501 barrel shroud is putting up a fight. :mad:

    I may end up either removing the barrel, slicing off the end of the shroud, and having a friend press the barrel out on a hydraulic press, or simply cut the shroud off.
     
    Last edited: Jun 20, 2020
  8. Pietro Beretta

    Pietro Beretta Posting Addict

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    Just bought a PR900W, but mine has a removable cover at the end of the barrel, which exposes a threaded section, onto which fits the supplied "moderator".

    DSCF0022.JPG
    DSCF0023.JPG
    Turns out the threaded section is too short for the GunTuff Moderator Adaptor to fit.

    Does anyone know of a screw on adaptor, that will adapt the thread to 1/2" UNF?

    The current thread, on the muzzle, is 10mm x 1mm pitch.
     
    willo1962 likes this.
  9. Nubble

    Nubble Donator

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    Something like THIS

    :thumb:
     
    shadowryder likes this.
  10. Pietro Beretta

    Pietro Beretta Posting Addict

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    Something like that, but I'm not sure that one will work because, as you can see, there's a plain section about 8mm long, at the bottom of the threaded section on the barrel, whereas that adaptor appears to be internally threaded for the whole length.
    ETA: I've ordered one anyway. For a fiver, it's worth a try.

    I know someone who runs an engineering company. He may be able to counterbore it, so it will fit the barrel.
     
    Last edited: Jul 4, 2020 at 5:12 PM
  11. bushy72105

    bushy72105 Engaging Member

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    @Pietro Beretta to solve your 501 problem you just need to soak it in hot water which will loosen it and a decent pull it will come off, they are notoriously difficult to get off.

    I had the JSR adapter for it and it worked well
     
  12. Pietro Beretta

    Pietro Beretta Posting Addict

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    Thanks for that bushy. :up:
    ETA: It worked. :nana:

    Filled a stainless steel flask with boiling water, and put the end of the barrel in it, supporting the barrel with my workmate (well, my Workzone folding bench to be exact :) ) for about 15 minutes, and bingo, off it came.

    Just got to wait for the scalding hot barrel to cool down, then I can re-measure, and order an adaptor for it.

    Have to say, the barrel look really :cool:, with no foresight.
     
    Last edited: Jun 27, 2020
    bushy72105 likes this.
  13. N.Vodden

    N.Vodden Busy Member

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    Looking at the advice I gave earlier re the barrel and adapter, it looks like SMK have changed the foresight/shroud on the newer PR900w's :/

    The one I bought had a barrel weight/compensator type end with a metal foresight on top that attached with a grub screw and slid off to reveal the 10mm barrel which you could add that adapter ( or any 10mm push fit mod ) to.

    That barrel looks like the CP2/PP800 style one with their own mod supplied so I guess they must be using that barrel in newer ones now.

    Glad you got it sorted, but sorry for any confusion!
     
    willo1962 likes this.
  14. bushy72105

    bushy72105 Engaging Member

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    Glad it worked mate, don't know what they fit them with but always seems to do the trick! Enjoy.
     
    Gat Man likes this.
  15. Pietro Beretta

    Pietro Beretta Posting Addict

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    Yes, I think mine's the Gen 2.


     
    N.Vodden likes this.
  16. Pietro Beretta

    Pietro Beretta Posting Addict

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    Moderator adaptor for my XT501 has just arrived.:whoo:, and it looks really :cool:

    IMG610.jpg
    IMG611.jpg
    I think I may replace the grub screws with shorter ones, because they stand proud of the surface, and may snag on clothing, skin etc.

    Is it worth putting a rubber O-Ring in the bottom of the adaptor, and/or using a bit of Loctite on the barrel, to prevent any air or CO2 from sneaking out, instead of going through the moderator?
     
    willo1962 likes this.
  17. N.Vodden

    N.Vodden Busy Member

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    That looks great! Slick and streamlined.

    How effective is it?
     
  18. Pietro Beretta

    Pietro Beretta Posting Addict

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    I don't know, because the barrel isn't back in the gun yet. I'm still waiting on the grub screws.

    I do know the moderator is pretty effective, when fitted to my Sig P226.

    IMG550.jpg

    I'm trying to get all my moderator capable guns to 1/2" UNF, so I can swap moderators around.

    The only rifle I'm not going to be able to do that to, is my Gamo Whisper Sting, because it comes with a non-removable (unless you use a hacksaw/angle grinder) moderator.
     
    N.Vodden likes this.
  19. Pietro Beretta

    Pietro Beretta Posting Addict

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    I've put the barrel back in my XT 501, but I can't shoot it yet, because I still don't have the grub screw to secure the barrel.

    Anyway, with the adaptor and moderator fitted, it's 44" long.

    I wonder, am I now in possession of a .22" Long Rifle? :D

    ETA: Here's the finished article. :cool:

    DSCF0047.JPG

    Including the moderator, and moderator adaptor, the barrel is now 26" from breech to muzzle.
     
    Last edited: Jul 5, 2020 at 2:30 PM
  20. Pietro Beretta

    Pietro Beretta Posting Addict

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    I've got the silencer adaptor back from my friend, who has counter-bored it, and it fits my PR900W, like it was made for it. :cool:

    DSCF0048.JPG
    DSCF0049.JPG
    I can now fit any 1/2 UNF moderator I like, and without having modified my shiny new rifle, at all. :)
     
    willo1962 likes this.

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