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SMK QB78 Deluxe - Modded

Discussion in 'Anything Airgun Related' started by London177, Jul 20, 2007.

  1. London177

    London177 Member

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    Hello everyone,
    I know some folks will not rate this gun but I already own one now :rolleyes:. I'd like to add a little more power and I've found a small company willing to do the work for a relatively small amount of money.
    Has anyone modded thier QB78 and if so how has worked for you?
    regards,
    Alan :)
     
  2. EX Mod Cog

    EX Mod Cog Keyboard Hero

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    Hello Alan -

    I've never owned one of these rifles - either standard or modded - but they're definately worth tweaking as they're ' ok ' out of the box but can be made so much better with a little bit of work.

    There's even a mod to transform the XS78 into a PCP did you know ?

    Although I can't help you or answer your question - good luck,

    James.
     
  3. London177

    London177 Member

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    QB78

    Hello James,
    I found a very helpful fellow in Ian Lamb. I've sent him my rifle and await the results. Take a look at his website:
    http://www.qbtune.zoomshare.com/2.shtml

    I know I could buy something much nicer than a Chinese QB78 as money is not a problem but I like quirky stuff and these Chinese rifles are very quirky :)

    When my rifle returns from Ian I'll post a few pics.
    regards,
    Alan :)
     
  4. EX Mod Cog

    EX Mod Cog Keyboard Hero

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    I await the results ...

    James.
     
  5. apeman

    apeman Newbie

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    i got exactly the same rifle.
    also had some excellent advice via email direct from ian lamb and my gun club owner and local fieldsports shop,he has tuned loads of these and i did the tune myself,brought the new seals online and now its just under 12ft lbs on a warm day!!!
    the results speak for themselves,and i dont care about the peeps who say .177 is a girls calibre,i got a better and flatter tragectory and almost identical muzzle and target energy than most .22's - have a read up on neil jenkinsons article in mays airgun world.
    happy shooting
     
  6. stickfly

    stickfly Member

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    Bought one of these myself a couple of weeks ago.
    Chrono'd it last Saturday at 7.4 then fitted a tuning kit. It then chrono'd at between 12.7 & 13.4 :eek:
    Now got to de-tune to get it below the 12 again.
     
  7. bazwidajimny

    bazwidajimny Member

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    you said yours was doing 7.4 out ov the box is it 177 0r 22 as im trying to find out the power mine is doing took it out too day with open sites and shot 2 ferrel pigions and 1 magpie all about 20 25 yards no problem and its a 22
     
  8. DKOwen

    DKOwen Member

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    Us Yanks mess with these guys 'all the time'....

    In fact, for many of us it borders on compulsion. The guns are cheap (about $100 US) and easy to work on needing only a 7/8 inch strap of steel or very large screwdriver (in addition to 'normal tools').

    A bit of background may be in order. Here in California we're blessed with a chap named Tim McMurry, a third generation Airgunsmith. His grandfather was the west coast Crosman rep back before we were all born, he grew up around CO2 guns and now owns and runs http://www.mac1airgun.com/

    A number of years ago, his established reputation led to his being contacted by the Chineese looking for 'a better airgun to make', specifically a springer. Based on his experience (and his grandfather's and father's) he told them they were 'barking up the wrong tree'. They should make a clone of the truly great Crosman 160. This gun had, amongst other things been adopted as a training rifle in many venues (which explains the cock on closing action, to match the .22RF trainer then in use). He suggested adding scope grooves (a popular upgrade for the CR160 in his shop) and his shop got the first 200 guns (100 of each caliber) after many trips and consulting sessions. The originals all had to be rebuilt in his shop (I'm the proud owner of one of the .177s). He personally provided tooling, including rifiling buttons for the initial manufacture.

    He knew what he was doing for sure. The result is a cheap copy of a truly fine CO2 gun (one could argue the best ever). Able to do most anything you'd want. Clearly a great value, even at the shamefully high prices you good folks seem to have to pay for 'your iron'.

    Doug Owen
     
  9. Biffo1262

    Biffo1262 Active Member

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    There are many, many things you can do my friend some practical and some just bling. Whatever you do they are real fun guns to work on and shoot. Within certain constraints ie the temperature they are also very accurate. Mine, below has an AR2078 vented stock, MaxZbulk CO2 bulk adapter with pressure gauge, 12 oz paintball bottle with preset adapter, 9-13" JSR Pro swivel/tilt bipod, SMK 3-9x40 mil dot scope, Logun CCFC Carbon Fibre silencer fitted using a Julian Bond custom made 1/2"unf adapter, Rowan Engineering multishot magazine (this gun is the one featured on their website), satin Silver finish Uncle Mike's swivels and studs with Trail sling, Archer oversize bolt and the whole thing tuned by Ian Lamb of QBTune to 11.3ft/lbs
     
  10. milius

    milius Newbie

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    Location:
    Czech Republic
  11. i8allthepies

    i8allthepies Posting Addict

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    Hi,
    Yes, I've modded one of these using a kit from T.R. Robb. I also bought a trigger mod kit and valve housing removal tool. Power up from just over 7 ft/lbs to 11.4 ft/lbs and still as sweet shooting as before. BTW my rifle is a .22 deluxe.
     
  12. E553XBOYZ

    E553XBOYZ Well-Known Member

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    yes i am the proud owner of one of these toys as well, great fun had mine fully tuned by trobb, omg how powerfull it was doing between 12.5 13.9ft lbs then i de-tuned obviously. then i bought a special little adapter to try out :)put it through my choro 19.8-20.6ft lbs :eek::eek::eek: with logon penetrators 16 grains then it pushed a little bit higher with the 20.5 grains so can be very powerfull if you own a fac. i detuned mine back down to 11.8 perfect for me.

    airarms s410 carbine
    smk = xs78:eek:
     
  13. aj5303

    aj5303 Newbie

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    hi

    i bought the qb78 deluxe last month and got a really good deal on it. i live in the uk and i paid a little more for it than normal,however i really wanted this rifle for its likeability and thats it i have a wiehrauch hw100 which to me is a fantastic rifle, but i am now in a situation as i bought the upgrade kit for £50 from a bloke called t r robbs in essex and in the kit was a dvd showing you how to fit it and what tools you need, i am not a gunsmith but i managed to fit the entire kit in two hours with no problems and now its just under 12 lbs and now i prefer it to my wiehrauch purely because it is very acurate and very fun to shoot and unlike my wiehrauch its very light and easy to handle on a full days shooting.

    i have a .177 because my 100 is .22 and i know alot of people slate the .177 however i made a rabbit backflip after it took one between the eyes and pigeons no problem and i can shoot and kill with one shot at 35 to 40 meters no problem, the pellet i found that works best for the qb78 is the rws super h point they really pack a punch and i can fire the logun penetrators and promethius pellets easy i know they say dont use the promethius pellets in a bolt but i do and will keep doing it as they really have a fantastic killing impact but every rifle is different.

    but to summerise the qb78 out of the box is good but upgraded its fantastic and well worth the effort and time ...... oh and just one other the sound moderator is really good but the adaptor with a weihrauch silencer is better in my opinion but im just waiting on a tap and dye kit to make the barrel a 1/2" UNF so i can get rid of the adaptor

    hope this helped you in any way thanx AJ:up:
     
    Last edited: Oct 21, 2009
  14. bigchap

    bigchap Banned

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    i tuned mine myself using charlidatunas guide and it shoots really nicely,super accurate and nice and light.my shooting buddy has an hw100 and we often swap as he prefers to shoot my xs78!
     
  15. datadave

    datadave Engaging Member

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    SMK QB78 Modded

    :) I recently bought two of the thumbhole versions in 177 - one for me and one for the wife. Out of the box, my wife was grouping much better - I was getting larger groups with erratic 'fliers'. Took me days to get over the humiliation. :eek: Inspection showed that both the stock and barrel were loose on my rifle - tightening em up improved things. No doubt a complete strip and clean-up of swarf, fraze etc left over from manufacture would help so the next phase is to fit a tune kit. I've gone for the TR Robb one as I wasn't aware of any others being available. Haven't chrono'd them yet but will do so before I start the tune-up work. General opinion seems to say that 22 tune easier than 177? Does Ian Lamb do a kit?

    Next step will be to convert to 'bulk fill' CO2 - any info about doing this would be very useful as I'm a newcomer to this lark! Is it possible to fit a pressure gauge? Where can I get one from? We seem to be getting about 80 shots per 2 capsules at the moment. How difficult is it to convert to air?

    I'm sure the answers are out there! Cheers, Everybody :wave:
     
  16. jetski

    jetski Keyboard Hero

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    i bulk fill mine from a 2kg co2 fire extinguisher, much cheaper to run this way.

    you can fit a pressure gauge but it will always say 850psi as thats what liquid co2 is. by the time theres no liquid left and just gas you wont have many if any shots left and the gauge will drop like a stone. not much use really.

    if your getting 80 shots then your power must be pretty low. about 35 full power shots is the norm

    to convert to air you must have an external bottle with a regulator to make sure the gun only gets 850psi and not 3000 like most pcps or it will go bang!

    if you have bought a tr robb kit does that mean you have your old bits left over? do you want to sell them?
     
    Last edited: Jun 15, 2010
  17. Jack

    Jack Big Poster

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    He has 80 shots between both guns, that works out to 40 each? So it's about right? :s
     
  18. mick 1986

    mick 1986 Keyboard Hero

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    thats not the way i read it mate. the xs78 runs on two 12g caps.

    as for getting a tune kit, why? its MUCH cheaper and more fun to do it yourself.

    if your stuck then check out ukchineseairgunforum.

    mick.
     
  19. datadave

    datadave Engaging Member

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    :up: Thanks for that, Mick. Once I've got stripping and modding one of em under my belt I'll have a go without using a kit - the wife's gun of course!
     
  20. datadave

    datadave Engaging Member

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    :up: Thanks for that Jetski. If I'd a thought about it a bit more, I should have realised that there was no point in fitting a pressure gauge with CO2 - as it remains constant while there is liquid left, dont it?. From what you say it seems it might be a good idea to fit one if converting to air, though - to prevent bursting the tube. Any ideas where I might get one from?

    I'll let you know about the parts - when I've done the upgrade.
     

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