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SMK DB4 broken underlever clip

Discussion in 'Anything Airgun Related' started by Tim Park, Sep 8, 2007.

  1. Tim Park

    Tim Park Active Member

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    Hi im new here :)
    I bought an SMK DB4 rifle last week, but unfortunately the underlever catch clip broke off with a ping this morning (sounded a bit like a garand stripper ejecting lol)
    I was wondering if anybody knows where I can get a spare from , or whether SMK will send me a new one. The gun's still shootable but I dont fancy holding the lever instead of the stock.
    I live in the derbyshire area btw.
    Thanks :)
     
  2. Rockabilly

    Rockabilly Big Poster

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    hi mate did you buy it new? if so i would take it back to the shop
    and ask for the money back, save up a few quid more and get a lightning xl or a hw 95:up:;)
     
  3. Tim Park

    Tim Park Active Member

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    I got it new until I can save up for a Weirauch or Theoben, its not too bad, I was shooting pepsi bottle tops off a tree stump at 20 yards with the standard iron sights this morning, it shoots like a laser when its zeroed in. I've got a rubber band on it for now which is holding the lever in place reasonably well and im hoping to make it into a project gun....refinish the stock, new springs and maybe a scope. Dunno if I can get it replaced from where I got it cos I didn't get a receipt though i'll try.
    Do SMK do spares at all? I sent them an email but I won't get a reply till monday at the earliest.
    Thanks :)
     
  4. Darren Petts

    Darren Petts Temporarily Alive

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    SMK aftersales is notoriously abysmal. They only supply RFDs with parts as you may hurt yourself fitting them!!!. They are also very quick to threaten litigation for knocking them. I wouldn't touch either the company or the guns. Best bet is to return it as unfit for purpose as it's broken whilst so new and demand a refund.
     
  5. Tim Park

    Tim Park Active Member

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    i've just rang them and the part will be with me in 2 days. If not i'll return it.
    It's only a project rifle but i just got it chronoed at 11.8 ft ibs, 709 fps so its not too bad. Accurate too.
    They're probably sending the part cos its not an internal bit, though I may buy a better spring, and try and get it up to 14-odd pounds.
    I was thinking of getting a crosman Co2 but the muzzle velocity seems a bit low for hunting, only 550 fps, so i'll most likely hold out and get a decent weirauch springer/gas ram combo.
    Thanks for the help anyway :)
     
  6. Buzz

    Buzz Banned

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    Tim...uprating to "14 odd pounds" is not only not recommended and will certainly damage the gun due to increased recoil, it will make it less accurate for the same reason too, BUT it's also illegal and possesion of it alone (without ever firing a shot) is worth a 5 year stretch inside if you haven't got a Fire Arms Certificate.
    With the 11.8 ft/lbs and 709 FPS you're either using very heavy .177's or very light .22's, as that combination equates to 10.56 grains of pellet weight. The Crosman Rabbit Stopper quotes 600 FPS for .22, but doesn't say at what pellet weight. What I can confirm is that if its around the 15 grain level it's very close to maximum energy. I can also confirm that 600 FPS with 14.66 grain H&N FFT pellets is ample to dispatch a rabbit at 25/30 yds.

    For information the formula for calculating the ft/lbs, as used by the Mk4 Combro cb 625 chronoscope is this...

    ft/lbs = pellet weight in grains x fps x fps all divided by 450240
     
  7. Tim Park

    Tim Park Active Member

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    I used the chrono at Walkers of Trowell, and I'm using no.3 wasp 22 pellets. .177 is good for nothing other than plinking at sub 12 ft ibs imo.
     
  8. Rockabilly

    Rockabilly Big Poster

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    your having a laugh mate .177 at 11.2 ftlbs will drop a rabbit at
    50 yds no problem:rolleyes:
     
  9. Tim Park

    Tim Park Active Member

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    I've never tried dropping anything other than birds with a .177, I'm going to give it a try before I buy my next rifle. I'm quite keen on the Brocock Hunter at the moment, they've had one in my local gunshop second hand for a while now at a good price, so that may be my next one.
     
  10. Rockabilly

    Rockabilly Big Poster

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    tim, there will always be an issue between .177and.22
    but believe me .177 is the best allround calibre,all top hunters and hft
    shooters use it , does that not tell you something.;)
     
  11. Buzz

    Buzz Banned

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    Tim...I've just found this

    http://extorian.co.uk/shooting/index.html

    Just try putting in the weight of the eley wasp and 709 FPS and see what the Ft/lbs come out to.

    Something certainly doesn't add up with the figures you're quoting.
     
  12. Tim Park

    Tim Park Active Member

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    I'll take it back and get it checked out again, only 50p a pop.
     
  13. Darren Petts

    Darren Petts Temporarily Alive

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    Wasps in .22 are around 14.5 grain and 709 fps = 16+ft/lb. The DB4 is a poor quality Chinese gun that'll struggle to make 12 ft/lb without shaking itself to bits. You have either made a mistake in operating the chrono or it is broken.


    As to uprating to 14 ft/lb - have you read the law?
     
  14. Tim Park

    Tim Park Active Member

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    I start my army training in a couple of weeks, so getting a firarms license for an air rifle shouldn't be too hard, plus I'll need a decent rifle for when I go hunting that will shoot straight and kill humanely.
    Apart from shaky build quality, the DB4 isn't bad at all with the right kind of pellets. I'm getting mine tested again because it seems way too powerful for 12 ft ibs. Its going through things from too far way too easily. Ie leaving a neat hole in a 1 inch thick chunk of mdf and blasting a huge chunk out the back. Its been that way since I lubed it properly and got rid of all the s****y chinese axle grease in it.
     
  15. Buzz

    Buzz Banned

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    Unless things have changed for the better recently, your Army training won't help you to get an FAC...just because you train to use firearms in the military doesn't mean you'll be granted one as a civilian. You'll still have to prove "good reason" like everyone else and the FAC you need for an air rifle over 12 ft/lbs is exactly the same as required for live ammunition. The warning bells are ringing as far as I'm concerned, the fact that you were actively seeking to take your gun above the legal limit knowingly, leads me to believe you may not be FAC material anyway. This is the sort of action that gets good law abiding people a bad name too...it's why there are so many regulations now and why it's so important for every one to act responsibly.
    A legal 12ft/lb gun is plenty powerul enough to hunt the vast majority of "general licence quarry" without the need for more power. If you want to hit moving targets and feel the kick and hear a big bang, then get a shotgun....you have the right to own one, it's down to the Police to prove you shouldn't.....FAC is the opposite...you have to prove you need one.

    http://met.police.uk/firearms-enquiries/f_reasn1.htm
     
  16. Darren Petts

    Darren Petts Temporarily Alive

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    Tim.
    As Buzz says a civvy FAC has zero to do with any military career or training. Read the link in Buzz' post. If your DB4 is too powerful it's almost certainly because it is dieseling. What lube did you use in the rebuild? Use too much or the wrong kind and in the wrong areas and as the piston slams forward it burns some of the lube just like a diesel engine does. You are 100% correct to get rid of the Chinese lube as they lace the guns in it to prevent rust during transit. This leads to a very quickly burnt out seal and piston damage and wildly fluctuating power outputs which itself equates to hitting very little. The DB4 uses a leather piston washer unless they've upgraded recently and that can simply soak up lube like a sponge and then diesel for ages (thousands of shots). You need to get rid of any lube infront of the piston. Almost all new springers diesel to some degree when new so some dieseling is going to happen. Most spring guns don't fully run in until they have a couple of thousand pellets through them.
     
  17. Tim Park

    Tim Park Active Member

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    im not kidding when i say that when i first got it there were flames and a lot of smoke from the barrel, more visible cos i was firing in low light conditions.
     
  18. Darren Petts

    Darren Petts Temporarily Alive

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    Get rid of all the lube from infront of the piston as soon as possible Tim before it damages the gun. It may look cool but blowing chunks out of your seal isn't conducive to a long operating life.
     
  19. Tim Park

    Tim Park Active Member

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    First thing I did, after lubing that awful stiff trigger. it's pretty sweet now. Just waiting on that part and I'm set to start tuning and modding (within legal limits of course).
     
  20. Tim Park

    Tim Park Active Member

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    Fixed it :)
     

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