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Thread: Home tune on LGU?

  1. #1
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    Home tune on LGU?

    Hi Guys,

    I can't see a custom section on this forum, so I'll just ask here.

    I have an LGU that I have fiddled with the trigger. Now that's perfect for me, I want to reduce the recoil.

    If I stuck the piston on my lathe and thinned the wall down to say half thickness (reducing the piston weight) would that reduce recoil?

    I'd leave the two ends untouched, just thin out the middle 4/5ths.

    No doubt the spring would need to be adjusted to get the power back to where it needs to be (chorno on it's way).

    The other thought was to mill out 4 good size slots in the piston to lose weight. I have the tools.

    Would I be asking for trouble, or a good way to reduce recoil using standard parts?

    Thanks.

  2. #2
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    By reducing piston weight you would possibly reduce power, So to increase spring length to gain power lost and to possibly gain more recoil, Myself i would aim to set gun if 177 cal to about 10.5 , If you've recently bought the gun I would get a good few months of shooting out of it first before I started going to far with it, My lgu had a kit fitted already to it , That was 177 cal and was shooting at 10.5, The chap who bought it off me phoned me recently to say how smooth and lovely it shot compared to his tx which has had a lot of money on it with regards to tuning,

  3. #3
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    My LGU was the most accurate .177 I have ever owned. It never ever occured to me to tune it.

    The only reason I got rid was the weight. I finally called it a day on heavy springers.
    Arthur

    I wish I was in the land of cotton.

  4. #4
    eyebull's Avatar
    eyebull is offline Even a stopped clock is right twice a day
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    If it's shooting accurately, I would leave it alone.
    Good deals with these members

  5. #5
    Hsing-ee's Avatar
    Hsing-ee is offline may also be employed in conjunction with a drawn reciprocation dingle arm, to reduce sinusoidal repleneration
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    Leave it be. If you want to reduce recoil, stick a heavier scope on it and/or some lead in the stock.

    If you want to tune something, get an HW99S and finish it properly then get one of tinbums guide kits.

    Should keep you busy for an evening or two.

  6. #6
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    I've not shot a springer for years, and certainly not a 'proper' one like this

    I ran about 150 shots through it the other evening on a farm I know, target in the field with crap pellets.

    Today I got more serious. I set up an 18 yard bench rest shoot in my garden and shot about 200 shots.

    I discovered the crap pellets really were crap!
    I was able to get a 10mm hole (well under a 5p) with 10 pellets using AA Diabolo Field 8.4g 4.5mm
    My PCP (AA S400 MPR FT) was able to put single holes with 10 pellets

    I wouldn't say the LGU was hold sensitive, but it did make a difference if you held it firmly. It's like a big dog, it goes where you make it if held firmly. My small daughter (who you will meet at the springer bash) had her first go on the LGU springer with me today. She nearly fell off the chair after the first shot Once she discovered how different it was to shoot from her PCP, she was grouping 10 shots in a 5p Think I may have her hooked on Boing guns now! Her face said it all after a good shot

    So it seems the gun is going well, but less recoil is always going to be better. As you say, tread with caution with something that aint broke!

  7. #7
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    Much good advice up above.

    Personally, I'd be holding back on piston lightening as described for a while......

    Lightening the piston will give faster piston acceleration and may result in slightly less primary recoil, but COULD result in more piston bounce (surge) which is much more detrimental to hold sensitivity. The piston on this 25mm bore gun won't be that heavy anyway.

    For now, I'd be paying more attention to technique and "get into" the art of springer shooting. This will generally mean employing a looser "hold", letting the gun move around, the whole point being repeatability of hold. If you grip a springer tightly, you cannot guarantee gripping it to the same degree each time.

    Also, although you are using high quality pellets, there is no guarantee of absolute accuracy. This was shockingly demonstrated last week at The Bash....HW95 with high quality, JSB Exact 8.44 pellets. Rested. Range approx 15 yards and the groups were about 2" diameter! Yes, really! Before the owner explored other (much more complicated) avenues, fingers crossed I made a bit of a "stab in the dark" suggestion that he tried some other pellets. He had a selection with him. Switching to the same pellet, but a different batch number, group sizes shrank to just slightly larger than single pellet hole. Not sure if it was just a bad batch or just a case of this barrel not liking that particular batch.
    THE BOINGER BASH AT QUIGLEY HOLLOW. MAKING GREAT MEMORIES SINCE 15th JUNE, 2013.
    NEXT EVENT :- May 4/5, 2024.........BOING!!

  8. #8
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    It is shooting well, so I'll leave it and run it in some more in time for the bash

  9. #9
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    My experience with the LGU is that it is up there with a tuned HW or Air Arms-they are superb air rifles!. My advice to the OP is persevere and use quality pellets.
    'It may be that your sole purpose in life is to serve as a warning to others'.

  10. #10
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    Got a new one running nicely by opening the transfer port and reducing spring. Smooth and very accurate rifle.

    Baz
    BE AN INDEPENDENT THINKER, DON'T FOLLOW THE CROWD

  11. #11
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    Yeah, as Baz said first thing is sort the port - open to around 3.2 if it's at std 2.9mm. Possibly more depending on the below.

    Weight the piston - how heavy is it ? Also what cal are you ? .177 tend to bounce more than .22

    Also what's the stroke ~88mm IIRC ?

    You cant just generalise on "light pistons reduce recoil", it depends on all the variables, otherwise all guns would have ally pistons.

    You also need to think about what you want from the gun - do you care about cocking effort too ? or Surge ? Or accuracy ? Or full power ? Or hold sensitivity ? Or sight picture movement ? Or just "recoil" ?
    Always looking for any cheap, interesting, knackered "project" guns. Thanks, JB.

  12. #12
    Barryg's Avatar
    Barryg is offline Registered ̶D̶i̶a̶n̶a̶ User
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    Quote Originally Posted by Rapidnick View Post
    My experience with the LGU is that it is up there with a tuned HW or Air Arms-they are superb air rifles!. My advice to the OP is persevere and use quality pellets.
    Can anyone explain why a LGU is equal to a TX when a TX is better looking has a better trigger a better underlever set up and wins competitions just to mention a few things.
    What bit of a LGU is equal to a TX? Is it that they are cheaper

  13. #13
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    Quote Originally Posted by Barryg View Post
    Can anyone explain why a LGU is equal to a TX when a TX is better looking has a better trigger a better underlever set up and wins competitions just to mention a few things.
    What bit of a LGU is equal to a TX? Is it that they are cheaper
    a stroke similar to the MK 2 TX so are less hold sensitive , ie easier to shoot accurately in standard trim.

  14. #14
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    Quote Originally Posted by NickG View Post
    a stroke similar to the MK 2 TX so are less hold sensitive , ie easier to shoot accurately in standard trim.
    But mk3s still beat the LGU in competitions but even if you are right that's 1point to the LGU and 100 points to the TX

  15. #15
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    Quote Originally Posted by Benelli B76 View Post
    Got a new one running nicely by opening the transfer port and reducing spring. Smooth and very accurate rifle.

    Baz
    What did you take it out to Baz .?
    Is it your gun ?

    Got one here that i'm having a fiddle with .

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