Jump to content

Archived

This topic is now archived and is closed to further replies.

snowy70838

Spring choice for V2.5 gearbox

This thread is over three months old. Please be sure that your post is appropriate as it will revive this otherwise old (and probably forgotten) thread.

Recommended Posts

I have modified a G&G SR25 to take a version 2.5 gearbox.

 

Does anyone have experience with spring choice for these gearboxes? I am after 400 to 425fps.

 

The barrel is a 509 x 6.03mm madbull.

 

Thanks

Share this post


Link to post
Share on other sites

What is a version 2.5?

Apparently it's a long version 2 gearbox (longer cylinder and piston etc), mainly in sr-25's from what I have read

Share this post


Link to post
Share on other sites

Yes. The range has increased dramatically and it is only pushing out at 360fps at the moment. Using 0.36bb

 

I should say it's pushing out 360fps using 0.2g bbs but i actually use 0.36g bbs for test shooting.

Share this post


Link to post
Share on other sites

I don't see how the type if gearbox has any relevance in increasing the range. That's all to do with the power, hop and barrel.

Share this post


Link to post
Share on other sites

It is something to do with the cylinder to barrel volume ratio being better for long barrels. As the V2.5 has a longer cylinder/piston than a V2.

 

I dont understand this myself but all i can say is it works.

Share this post


Link to post
Share on other sites

×
×
  • Create New...