Hello All. Hope all is well with you. As my post suggest I need help with my SL8 sniper. Not getting max fps with SHS M170. Getting a max of 520 fps with 0.20s. I tried two SHS m170 springs and 520 was the max. Not satisfied. I know I can achieve more with that spring. Can skip this part. I consider myself an average tech, so I'm not so 'ignant'. Was able to achieve 540 fps with 18:1 gears and m150 spring (I know of people who got more with that similar setup). I play at no limit fps outdoor games. I don't shoot when they are less than 50 feet away which is why I carry a secondary mp5k. And gun is on semi. Safety is number one concern in our team. Don't believe me. Then I can't help you there. Would like to thank Tackett (Aug DMR Post / My guide to fine tuning a Hop-Up Post) and Griffin (100% Compression Post) for their posts which inspired me to build mine. Oh ya. The modified AK Box Mag works, but is just for looks. I don't use it on the field. When I get satisfactory results will put this on Ehudakineyah (Tech Notes, Builds, Diary) post with a better picture. Love that post. Those who haven't read it are missing out. Now to the good parts. Here is the break down of this gun. CA SL8 based. Internals. SHS M170 Spring SHS 32:1 Gears SHS Aluminum Cylinder Nozzle w/ Oring SHS 7mm Bushings SHS HT Motor SHS Tappet Plate Super Shooter Ball Bearing Aluminum Piston Head Super Shooter V3 Spring Guide JBU Half tooth piston CA Cylinder Head (If I remember correctly) #14 Oring Type 0 Cylinder (Don't remember company) Sorbo 70D CA Hopup DIY Mosfet Gens Ace 11.1 25C 3000mah Externals CA G36C Outer Barrel Assembly CA Large Handguard Private Parts Magwell Spartan Doctrine 335mm Silencer ~630 madbull 6.03 Inner Barrel (Cut down 650) Mods Radiused GB Liquid Nailed Cylinder to Cylinder Head Hopup (My guide to fine tuning a Hop-Up by Tackett) Sanded down tappet plate. AOE Future Mods / Parts R hopup Port Cylinder Bore up Cylinder Riots 40.91:1 14.8 Battery Terminus X Omega Not going m190. Then I'll have to use riots. When I have the money then you'll see this being a different monster. +mwahahaha+ I have done the compression test and the compression is pretty solid even with the nozzle extended. I used three different hopup buckings and 520 was the max I have received, don't remember the brand. I feel that my loss in fps is in the hopup chamber itself. Instead of using a CA stock hopup I might have to try the 5kU/Matrix, Prowin or even SRC hopup chambers for a better seal. I can't find anywhere online where people use m160+ to achieve high fps with a g36 variant and I am interested to know how I can achieve this and if the CA hopup is the problem. Also can anyone teach me an easier way to put in a v3 spring guide (no hole by the way) coupled with an m170 spring in the gearbox by myself? Freaking hard. Had my buddy help me out.