S&W78G

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    Jonah
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    Sometimes even a blind squirrel will find an acorn.  I’ve basically quit going to the very small gun shows near me because they rarely have a decent attendance and have very few dealers.  Would not have gone today, but it was heavy overcast with mist and I really didn’t have anything in the shop to do.
     
    Well, the third aisle I turned down, what was staring me in the face but a S&W 78G with original box and manual, spare o-rings and four CO2 cartridges.  Only $125.  Dealer was original owner and said he bought it new in 1974, resealed it once in 2002 and he thought it would hold CO2 since he had not shot it in years. I offered him $100 and he took it.
     
    Very long story short.  Gun looks brand new, not a scratch on it anywhere, screw slots look like when gun left the factory, gun has not been refinished.  Put  a CO2 cartridge in it, no leak.  Fired it and could hear leak through valve.  Fired it about ten more times and leak stopped.  Don’t know if it will hold CO2 overnight, but I bought it knowing I might have to reseal it.  Gun goes great with my two 79Gs , Crosman MK1, Sheridan E Series 5mm and other vintage air pistols.
     
    Luck of the Irish, and I’m not even Irish.

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    JohnL57
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    Nice find! Tom Gaylord mentioned on his blog you can sometimes revive old seals by putting some Pellgun oil on a Co2 cart and then dry firing for a powerlet’s worth. Never tried it myself though.

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    spysir
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    Nice rig. Looks to be a 1st Gen. ?   Adjustable trigger?
     Should you need to rebuild it they can hit 500fps+ ( warm day) with little masaging.

    For a regular Gun show not a bad find at all and it seems you needed one for the collection.

    John

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    Nitrocrushr
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    Good looking pistol!  I sold my 79G last year, very accurate and consistant.

    Steve

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    crosman2016
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    Nice find OP.  With that pistol properly sealed, about how many shots does one get out of one CO2 cartridge?

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    Jonah
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    Well, the78G held all the remaining CO2 overnight.  I fired it once and could not hear any leak.  Appears that maybe the exhaust valve has seated.  Of course, it may not last, but time will tell.  If it leaks later, I’ll reseal the gun.  I’ve never counted the shots from my 79Gs or this 78G, but I’m guessing about 30 shots per CO2 cartridge.  Guess I should take the time to count the number of shots.

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    Nitrocrushr
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    After installing all new seals from Precision Pellet, my 79G had 45-50 usable shots per fill.  It also had an extreme spread of only 8fps.  In stock form, velocity was around 420fps, but with the new seals and better poppet valve design it bumped up to around 500fps.

    Steve

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    Kev
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    Nice Jonah!  I love the 78(.22) and 79(.177)G, and how it is completely ambidextrous in grip and cocking, which is a great trainer to learn to shoot off hand.  Air gunners who have only shot modern  AG s would not believe the weight and balance these old AG s have.  What a find you have made.  Congratulations!

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    fredcbr
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    here is a picture of my 78g and 79g.I adore them.

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    Jonah
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    Nice!

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    Skillet
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    They’re well built guns. Trigger and accuracy aren’t quite up to scratch, compared to my MK1… But S&W dint use the best barrels on mine (Have the 77A rifle, too. Ghost-Rifling on both guns)

    Still, used mine for spot-lighting pigeons and water snakes. Piled up alot of critters with it. Like that u only need 1 finger to open the bolt.

    A MK1 piercing unit fits these, as well. Apparently a former Crosman engineer went to S&W and helped design their airgun line. Velocities here are same as urs, in stock config

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    readyfisher9
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    If you ever need work on it , Mac1 can both reseal and boost the velocity much higher.  Pell oil about every third CO2  cannister , and leaks will probably stay away. 

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