It is shooting well, so I'll leave it and run it in some more in time for the bash
It is shooting well, so I'll leave it and run it in some more in time for the bash
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.
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Got a new one running nicely by opening the transfer port and reducing spring. Smooth and very accurate rifle.
Baz
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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.
Hi,
I am considering doing the same to my .22 LGU so could you tell me what size you opened the transfer port to and the shortened length of the mainspring.
What are the chrono readings now after the modification?
I have ordered a new cylinder and mainspring just in case I cock it up.
Cheers
Ray
Hi Sunbeam,
I have the LGV (the break barrel version). I find it very smooth and accurate but note like you that it has some recoil. Some of this is or rather seems to be twist (torque from the spring?). Now it is out of warranty I intend to strip it polish the spring ends and remind to see if that helps.
I am also thinking of adding weight at the muzzle to see if that reduces any muzzle flip. This latter option is a cheap, easy and reversible way to see what happens which might be worth trying on your LGU?
Cheers Rich.
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Pure physics dictates that you will always have recoil in a spring (or gas) piston powerplant. However, this can be reduced in many ways, by tweaking the internals and/or increasing weight and altering the weight distribution to give more favourable movement characteristics.
I've mentioned a few times on here of one particular LGV that starkly demonstrated the twist you mention. I also opined at the time that I believe this phenomenon to be more illustrated in guns with rotating pistons. In all fairness, that rifle shot beautifully. Very little perceived recoil and a very quiet action. Shooting at a 20 yards indoor club range with a high mag scope and the twisting effect was very prominent. Certainly not knocking it as it was accurate and forgiving to shoot. Making sure those spring ends are square and true, polished and with the addition of some polished steel washers, or Delrin items, will hopefully reduce this.
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