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Thread: 1000+ FPS 8mm Giffard HPA conversion

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  1. #1
    Join Date
    Aug 2011
    Location
    Stevenage
    Posts
    318
    Hi
    I recently had chance to shoot this gun ..... Oh yes it does make an impressive bang !!!

    Great that it is still in use
    Cheers
    Si

  2. #2
    Join Date
    Mar 2008
    Location
    Seattle
    Posts
    113

    Any thoughts of making a kit for sale?

    Hi Buxton, it's wonderful to see the results of your elegant thinking. I have long wondered about getting the old Giffard working in anger. With no arcane regulations over here in the US, I would be seriously interested in obtaining a kit of parts for your bolt-on modification. Any chance of that happening?

    Best regards,

    Marc DV

  3. #3
    Join Date
    Jan 2008
    Location
    St.Albans
    Posts
    3,241
    Yes,over here we are only allowed guns that go pop!

    To have one that goes bang requires an FAC!

    Such is the land of Draconia!

    ATB.
    Last edited by mrto; 24-08-2013 at 06:33 PM.

  4. #4
    Join Date
    Jan 2010
    Location
    Formby
    Posts
    3,278
    Just took another look at the picture of said beast. What a cracking bit of history you have managed to revive there. Surely the airgun equivalent of a Purdey?

    Andy
    Member, the Feinwerkbau Sport appreciation Society (over 50's chapter)
    http://www.rivington-riflemen.eu/ Andy, from the North !

  5. #5
    Join Date
    Oct 2011
    Location
    Manchester
    Posts
    12

    Groupings good

    The other day I fitted a telescopic sight to my 8mm Giffard for some accuracy

    It was grouping at around 1" at 50 yards with home cast 8mm balls at around 1000fps

    Groups much better at this velocity than it does on co2 at longer ranges.

  6. #6
    Join Date
    Jul 2017
    Location
    milbank
    Posts
    2

    8mm buxton conversion

    I am a new member as of yesterday. This is my first attempt to communicate on this sight. As I purchased my 8 mm Giffard, without reconditioning co2 cartridge I am getting about 370 ft / second with a 3.15 round ball. instead of rebuilding the original cartridge I would like to leave original. I see there is a 8mm buxton conversion for my Giffard. I would be interested in plans, diagrams or kit all ready to go.
    Thank you. Calvin Moser, South Dakota.

  7. #7
    Join Date
    Nov 2024
    Location
    southend
    Posts
    13

    Giffard Gas cylinder

    Hi I am new to this Forum and new to Giffards. I would like to know what the thead is on the Gas cylinder so that I can get an adaptor made to fill from an extinguisher. If anyone can give me and help in what I need to obtain I would be very grateful.
    I have heard so much about these Guns and would love to get my 4.5 firing again.
    Many Thanks
    Jerry

  8. #8
    Join Date
    Nov 2009
    Location
    bristol
    Posts
    166
    hi chris, very interesting thread. i've been thinking hard about trying to buy a giffard in good working
    order to shoot. to make it easier to charge i was wondering whether it would be feasible to make a
    replacement cylinder that would hold two 12g co2 capsules. as you are clearly very knowledgable
    about these guns i'd value your thoughts. incidentally, are all giffards running on co2 over the 12ft/lb
    limit or could i shoot the smaller calibers (supposing i can find one) without putting it on fac?

  9. #9
    Join Date
    Oct 2011
    Location
    Manchester
    Posts
    12
    Hi,

    It would certainly be feasible to make a tube to take 2 or 3 of 12g capsules, obviously the price of gas in this form is fairly expensive but other than that no problems.

    An 88gram cart will not fit as the diameter is too large.

    A cheap way to bulk fill the original tube would be to utilise a old full co2 fire extinguisher from fleabay.


    Giffards in 6mm and 8mm calibre flavours are well over 12ftib, but possibly the .177 variety are under so could be shot without a FAC.
    Maybe somebody with a .177 Giffard rifle can chime in with the power.

  10. #10
    Join Date
    Feb 2013
    Location
    Toulouse
    Posts
    21
    A very interesting post and excellent conversion.
    I manage to get to gun shows regularly in France, but these days fewer & fewer Giffards seem to appear, and it must be ages since I saw a nice Giffard pistol for sale. Perhaps they crop up a little more frequently at the specialised auctions - which I rarely follow.

  11. #11
    Join Date
    Oct 2011
    Location
    Manchester
    Posts
    12
    I was talking to a Firearms dealer the other day, He told me that although he has some Giffards in stock, they are currently not for sale.
    They are going to sit on them as the price of them is going up and up.

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