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SMK PR900W

Discussion in 'Technical' started by grumpygit, Feb 13, 2018.

  1. grumpygit

    grumpygit Member

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    I have an SMK PR900W pcp question is do I need an extra barrel band or should I leave it as is with floating barrel?
     
  2. monsta41

    monsta41 Donator

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    if it didnt come with one then it doesnt need one, adding a barrel band could alter the barrel harmonics and throw off accuracy.... floating barrels are usually more accurate than fixed
     
    VIKING6661 likes this.
  3. Simonsays

    Simonsays Donator

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    Is it accurate as it is? If so why change it? If not then perhaps there are other causes.
     
  4. mikeyhall1

    mikeyhall1 Pepe Le Pew

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    The way I see it is that it was designed not to have one mate
     
  5. badshotsyd

    badshotsyd Well-Known Member

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    I wasn't happy with the way the barrel can be shifted too easily with the supplied barrel band,in its installed position; pick it up carelessly and the barrel, being slender, is caused it to flex, so I made an extra band which sits in front of the stock end.

    Are there really harmonics with these low power rifles? I can understand the need on full bore firearms, has anyone done research on the subject regarding sub 12 ft lbs?
     
  6. RapidStype

    RapidStype Engaging Member

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    Rapids do the same thing and have no barrel band at all
    Even with the thicker barrel they still flex
    But they alays spring back after being leant on a tree.
    I have a 900 too and not worried about flex it shoots fine. .in fact it is like a mini rapid...and much cheaper than having a small rapid that was why I bought mine .
     
  7. ped

    ped Posting Addict

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    many who fit an extra band say that less poi changes occur between sessions as the barrel to breech contact is sloppy
    the stock band is too far back and a heavy silencer can cause droop
    if I had a 900 I'd fit an extra band and i'll be fitting one to a cr600 I have got
     
    Halinfax likes this.
  8. Halinfax

    Halinfax Full time tinkerer....

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    I have just got a 900W and I agree with Ped... the fitted barrel band is sloppy.

    I have made a split ally barrel band and put a .5mm slither of rubber between the barrel and band before tightening it up.
    It stops the barrel from being scuffed and also helps maintain a uniform distance between the underside of the barrel and top side of the air tube of 4.38mm (on mine anyway).

    Hopefully by fitting a shim of rubber, the harmonics/resonance frequencies of any "shock" should/could be dampened to be negligible.

    That's my theory on it anyway...
     
  9. Wing Commander

    Wing Commander Engaging Member

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    I too was concerned about the ease with which the barrel could float on my SMK PR900W. It was ridiculously easy to move the end of the barrel, and that surely cannot be right. The accuracy was okay but the constancy was questionable, and there were too many shots going wide.
    I raided the kitchen and made an extra barrel band from a piece of a Tesco chopping board, and popped it on the end of the barrel. It is only a tight, interference fit (no screws holding it in place) but it has transformed the gun's accuracy, and it now produces very tight groups at 30 yards.

    Mind you, I also fitted a Lane regulator to it (not at the same time) and that has really made a difference. The gun is great fun to shoot.
    Let's face it, if you line up the sights, squeeze the trigger and hit what you're aiming at, what's not to like....

    Here is the extra barrel band :

     
    Halinfax likes this.
  10. ioxide

    ioxide Well-Known Member

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    +1 on the barrel band, I found the barrel had way too much flex and a bit more consistent in accuracy after fitting one
     
  11. Halinfax

    Halinfax Full time tinkerer....

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    Wing Commander, a very ingenious use of a chopping board.....

    May I enquire as to why you fitted the Lane regulator. Was it to improve power or performance?

    I intend to tinker with mine soon, but just for now I have made a moderator and filing port sleeve (will post pictures from my pc soon)

    I have not been able to get out into the fields yet to check my 30 yard groupings, but the 10 meter ones are not to bad....
     
  12. Wing Commander

    Wing Commander Engaging Member

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    The tale of the Lane regulator begins thus:
    My grandson asked if he could fill the gun from our newly bought dive bottle. Before we bought the bottle, we had used a manual pump. Experience had taught us that 190 Bar was the best pressure.
    Anyway, he opened the valve (too quickly) and then didn't shut it in time. Before I could shut it for him, the gun now had 270 Bar in it..... oops.
    On shooting the gun, the performance was dismal. The power had dropped right down and it struggled to hit anything at 15 yards. The excess pressure was preventing the exhaust valve from opening properly.
    The gun finally started to pick up power when the pressure had dropped to more sane levels, but it just didn't seem to produce it's previous accuracy. It wasn't a happy gun.
    Time to take it apart and have a look.... That is when I learnt about Lane regulators.
    The hardest part of the job was removing the two "blocks" from the gun. One held the pressure gauge, the other was the valve block. Once these parts were out, the job was quite straightforward.
    I followed the installation instructions to the letter. . . If explained it would sound a lot more involved and technical than it really was, but it was all very easy.
    Whilst it was apart, it took the opportunity to polish the trigger components too, and reduce the "creep" on it.
    It all went back together nicely. The only drawback to the upgrade was having to lose the pressure gauge. The regulator replaces the old gauge block.
    From the first shot it was obvious that the rifle was vastly improved. The velocities were now very consistent and, conveniently, just under the legal limit. The regulator can be tweaked to suit personal tastes...
    It was (is) shooting at higher velocity than it did without the regulator but it is doing it reliably, shot after shot, and the accuracy has improved brilliantly. It is now capable of easily hitting sugar cubes at 35 yards, which is a favourite game played by my grandson and I.
    The Lane regulator is worth every penny. It has transformed a cheap gun into something which shoots straight and true.

     
    ped likes this.
  13. Morris147

    Morris147 Engaging Member

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    Interesting read as I am considering going for one of these as my first pcp. I'm not worried about running maintanace/adjustments.
     

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