Good morning, evening or whatever part of the day you prefer. I took my RPK on a game this Sunday and noticed it does not offer as much range as it used to. I own this gun for 4/5 years now, amount of BBs it shot can be counted in 10s of thousands. I never opened it and never modified anything so I need your help. At recent chrono it chrono'ed 370 FPS on 0.2 BBs. I use Titan Li On 11.1V 3000Mah, Don't plan on switching it. My local field allows machine guns to have up to 530 fps. I don't need so much. I would be happy with 480-490 FPS. I use 0.25 BBs or 0.28 BBs when its really windy. What spring should I look for? What manufacturers are good for machine gun kind of usage? Will my actual internals sustain more power? Should I change barrel Because of wear and tear? (I don't want precise barrel because I like to use cheap BB's to just spray and pray). If you have any questions about this gun I have some experience as I used it as my exclusive primary. Help would be appreciated, Thanks!

https://preview.redd.it/vsnmjqfz7onc1.jpg?width=720&format=pjpg&auto=webp&s=6a7bd28c1e516f361478958cbfd7d3c8c11573ed