I lost one of my springs ):

[Yashy]

"Under 300. at 1J"

What do you mean?  What weight BB are you using when you get 300fps?

0.25, im getting under 300 fps.

 

[Colin Allen]

0.25, im getting under 300 fps.

How much under?  Around 285-300 on a 0.25 is just about perfect.

With a 0.25g BB, the maximum FPS is 313, as it gives the same energy (Joules) as 350FPS with a 0.20g BB.

If you set up your rifle to be at, or only just below, the limit there is always a risk that you will be overpowered on a site chrono when you go to play; chronos are not consistent.

It is better to set the rifle up to be at about 1J (328FPS on a 0.20g BB or 295FPS on a 0.25g BB) and fit, for example, a 60 degree Maple Leaf Macaron hop rubber with one of AK2M4's red nubs.  You will see a noticeable improvement in range and consistency, especially if you also fit a better quality barrel.

 

[Galvatron]

yeah I used the m90 one, kinda wish I had a bit more fps! Im hitting under 300. at 1J

May I ask what you think you're missing out on by not quite hitting the joule limit? There certainly comes a point where the pellets travel so (relatively) slowly that you're not competitive on the field but in the real world, you're not going to be at an appreciable competitive disadvantage if you're ~0.1J below the limit. Maybe it's just me but I'd take being able to sight an opponent first and have a better trigger response over chasing the joule limit.