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Rapid issues

Discussion in 'Anything Airgun Related' started by 177, May 25, 2015.

  1. 177

    177 Donator

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    Just tore my FAC Rapid to bits - it was grouping like a badly shot shotgun :rolleyes:

    Porting looks squiffy:

    [​IMG]

    I'm guessing this ought not to be out of centre, or covered in metal shavings:

    [​IMG]

    Aside from that it's all good :rolleyes:

    This is a 19 inch barrel and the gun runs Bisley Magnums around 31 FPE and AAF Heavy at 29.4 FPE :up:

    Can't hit anything with it ;) but chrono results are healthy and within low single figure consistency.

    Is it worth cutting the barrel down and having it machined to fit with a new port or should I just replace it ?
     
  2. mikey

    mikey Pro Poster

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    Personally I would replace it with either another 19 in barrel or maybe a 21 inch
     
  3. cloverleaf

    cloverleaf Super Moderator Staff Member Mod/Admin

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    Your barrel looks very similar to mine (which is a later Mk2 with the Mk3 trigger; I forget the serial). Everything looks very similar including the rifling pattern and wonky bluing at the breech, and mine also prints groups more akin to the pattern of a shotgun :rolleyes:

    The crown on mine looks good (how's yours?) although the choke is pretty tight and I've heard many tales of barrels with excessively tight chokes shooting a lot better once the most restrictive part of the choke has been machined off (try the R7OC for more info).

    Other culprets could be the porting (too large or burred, damaging the pellets) or as you say the off-centre loading probe; which I suspect might be a .177 item fitted in error / lazyness.

    Were it mine (and I could actually be arsed to chase the problem as my rapid has been in bits for years) I'd start with getting a correctly-sized loading probe sorted and visually inspecting the porting in the barrel.

    I think it would also be worth pushing a few pellets into the breech, past the port and back out again - feeling for resistance and checking for damaged. Finally, push a few down the barrel until the meet the choke then out backwards, and again with fresh pellets but pushing them out of the muzzle. Compare the force required to push the pellets out of the muzzle with that required to push them through the rest of the barrel, along with the difference in deformation and rifling depth.

    If you don't find any problems with the port etc it's probably worth having a bit lopped off the muzzle before opting to replace the barrel.

    I'm sure you'll keep us posted however you choose to proceed :)
     
  4. 177

    177 Donator

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    Thanks for your replies :)

    Calm kicked in after my inevitable period of pique and irritation :rolleyes:

    I'm off round the corner to visit my retired gunsmith friend. He doesn't know it yet but I'm having the front of the barrel lopped off and crowned, then threaded, and I'm having the back end of the barrel chopped down and a new barrel port milled in (and lapped :rolleyes: ), and a grub screw hole.

    I will order a probe separately and tear everything to bits and give it a full service, while I'm waiting on the barrel being done and the probe arriving.

    The choke on my barrel is so tight I can pretty much only shoot Bisley Magnums - everything else just gets munched on the way out...

    I pushed pellets in and had to force them past the port. On removal around 2/3 of the skirt is badly scored, presumably from swarf scoring on the inside of the bore where it was ported by its former keeper.

    pfffff...

    I will accept a nominal drop in power due to the soon-to-be shorter barrel, for testing purposes at least. If it's all good when it goes back together, fair enough. If not, I may have at it with a very large sledge hammer...

    Watch this space.
     
    Last edited: May 25, 2015
  5. dave goodall

    dave goodall Donator

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    Get a ball bur inside the porting so smoothing out from the out side inwards with a dremel all tho your port size looks very extreme in size as for lopping of the choke that's a very risky option (guess u been reading big ALS posts ) u can polsh the choke out with autosol on cleaning mop but do it very liberaly and test again and test you dont want to go to far
     
  6. dave goodall

    dave goodall Donator

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    If u go the new barrel route I've a 15mm would need sleaving and porting 18 inch long barrel blank here very accurate but threaded end is 12mm thread but a good machienest could soon weave and retread 1/2 unf this is avert proven barrel of one the bullpups I had
     
  7. airtech

    airtech Engaging Member

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    there is no excuse for bad workmanship.
     
  8. bigtoe

    bigtoe Donator

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    What you need is a nice old S10 Barrel, the 19.5inch one, have it sleeved and ported to suit, if the choke is tight lose half of it and remachine for the mod.

    Knibbs have .22 S10 barrels, ask if they are old stock, so made when the S10 was made, if they are...ideal ;)
     
  9. 177

    177 Donator

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    So, ripped the gun to bits and, drum roll please...




    Ta Da !


    [​IMG]


    [​IMG]


    [​IMG]


    Aside from that it's all good :rolleyes:


    *sigh*
     

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