Because this gun is new and people are still getting there hands on them, I don’t know if the upgrades suggested by evike are appropriate. Hence I am looking for second opinions from the forum. Not to discredit them, just looking for more opinions. The gun is the new p90 with a spring of 400 FPS preinstalled and the link has a video from evike where it shows the gearbox inside for those who are not familiar with the new gun: https://www.evike.com/products/13727/ For internals I bought: Prometheus 6.03 EG tight bore inner barrel - length 260mm. (i know it’s originally a 255mm barrel, I have a tracer going on it) Madbull Shark Blue 60 degree Bucking Modified Baton Ryusoku Hard Bucking I bought these two buckings just to have and was recommended to use the Modified over the shark, do you guys agree? Anyways let’s get the meat of the question i’m looking to be answered. Like all, I want my gun to be shooting further, faster, laser accurate, and further more be reliable where I don’t have to be replacing internal parts due to wear and tear, what should I upgrade next if anything? I know that wear and tear would eventually happen depending how much use and bbs are shot, so before hammering me on that, please note that I am stating internal upgrades suggestions that will improve my gun and have me shoot XXXXXXX amount of shots without having to change parts sooner because the parts themselves cause damage to the shell of the gearbox or other parts. All this information, I got just from reading so I am trying to educate myself in internal upgrades. I also want to know what upgrades on this AEG are prone to getting damaged after use? That way I can send the gun to a professional to take a look at or do it myself to make sure that a specific internal is needing to be replaced soon. Furthermore, I was told because my intentions were also to shoot faster, the gears that were recommended for an upgrade to do were the 16:1 gears. If not mistaken, they have 18:1 gears on them now by default. I researched and found out the siegetek is one of the best gears to buy, but with a price. I messaged siegetek and they stated they don’t have a 16:1 but have other platforms and would need a V2/V3 gears for this modification with proper shimming, which I have never done ever before. On top of that, the one I assume that’s closest to the 16:01 ratio is their V2/V3 14.09:1. Money isn’t the issue for the initial buy for internal parts. I just want to also avoid having to replace parts after 10k-30k shots and play and shoot for x(x) amount of years before having then to replace damaged parts. If possible, not damaging the gun ever with any upgrade parts would be ideal, haha, if that is possible. My fields limits is 400 fps on .20 bbs 1.5J and 360 FPS .25 bbs 1.51J. Because the upgrades, I may improve my fps/joule on this gun, is there any spring alternative that will keep me at 400 on the dot with these current upgrades or with the suggested gear upgrade? <- **Only if you suggest the gear upgrade. If not then, a great brand spring for 400 fps with that joule output or slightly under like 390. Heard PDI and Prometheus as top springs, and then slightly few suggest guarder. Not a fan of cutting the coil down. I’ll be using .25 for my CQB. On another field I’ll use .28 and their requirement is only 400 fps. Have not heard anything of ROF requirements. This gun shoots at 20-21 bbs a second apparently. Thank you again and looking forward to an informative replies with no bashing on either me or anyone else’s replies.