strykerles Posted January 8, 2021 Share Posted January 8, 2021 So I recently purchased a brand new ASG Bren Was double firing on an 11.1v lipo and going full auto with a slight trigger pull in semi Power was around the 280fps mark when it did fire singly So I gutted it Fitted a gate titan, 16:1 gears, silent piston head, 3/4 cylinder Good air seal, good aoe, shimmed correctly Using a 7.4v lipo Put in a M105 spring (ASG) I had and it turned out 370fps Put in a M95 spring (ASG) and it turned out 365fps Put in a M90 spring (SHS) and it turned out 382 fps Any suggestions? maybe 1/2 cylinder? I'm at a bit of a loss as it's the lowest power spring I have. Looking for an M80 but having trouble atm thanks for looking Link to comment Share on other sites More sharing options...
Speedbird_666 Posted January 8, 2021 Share Posted January 8, 2021 1 hour ago, strykerles said: Put in a M105 spring (ASG) I had and it turned out 370fps Put in a M95 spring (ASG) and it turned out 365fps Put in a M90 spring (SHS) and it turned out 382 fps Any suggestions? maybe 1/2 cylinder? I'm at a bit of a loss as it's the lowest power spring I have. Looking for an M80 but having trouble atm Therein lies the rub - each manufacturer has a different idea of what they should label their spring power as, and two supposed identical springs from the same manufacturer can yield different results due to manufacturing tolerances. The quality of the steel and the coil pattern are also additional variables. As taking apart a CZ Bren can be a bitch to replace the cylinder, I would use the quick change mechanism and source either a weaker spring, or even consider cutting one down . Personally, I would put the ASG M95 spring in @~365fps and shoot a 1000rds or so through it. There's a good chance that the the FPS will drop to sub 350fps as everything beds in. Link to comment Share on other sites More sharing options...
Supporters Adolf Hamster Posted January 8, 2021 Supporters Share Posted January 8, 2021 you got thrust bearings on both the spring guide and piston? if so i'd pull the one from the piston, will give a little fps drop (and lessen pme). could be a shell thing, i know asg m95's are normally pretty damn close to 1j with a single thrust bearing in quite a lot of guns, but perhaps the bren has a little more preload than normal. Link to comment Share on other sites More sharing options...
strykerles Posted January 8, 2021 Author Share Posted January 8, 2021 Yeah it has bearing both ends of the spring but ideally I didn't want to take it apart again lol I'll try and source another spring and if that fails I'll cut a ring or 2 off one that I have Link to comment Share on other sites More sharing options...
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