Home tune on LGU?

[Benelli B76]

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

Baz

[Shed tuner]

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" ?

[hmangphilly]

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 .

[itsray]

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

Baz

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