druid799 Posted January 21, 2018 Report Share Posted January 21, 2018 So gentleman as the titles says my son is set on getting himself a KJW MK1 but unfortunately it’s running way too high for the sites we play at (400fps) so having never encountered this problem before I freely admit I haven’t a Scooby do how to solve this as previously if I thought a GBB was a bit ‘fruity’ I’d just stick lower power gas in it but the blurb says it needs green plus would a different gas even drop it sub 350fps ? Hence have decided to throw this problem out to you all . Cheers Druid . Link to post Share on other sites
hitmanNo2 Posted January 21, 2018 Report Share Posted January 21, 2018 Definitely try 134a/144a. It should drop it below 350. I don't see why it would need green. It's just a NBB. Link to post Share on other sites
ED-SKaR Posted January 21, 2018 Report Share Posted January 21, 2018 The KJ mk1 works just fine on duster, unfortunately it also runs just fine at 260fps on duster (at least the batch we had a the Werkz ten years ago did) There are ways to reduce it further, one way is to reduce tension on the mainspring. Someone found a replacement spring that brought it to 280fps on green gas (then we added a BB as a spacer and it hit 310 on green), but I have no idea who, and have no idea what spring it was. Link to post Share on other sites
Cannonfodder80 Posted January 21, 2018 Report Share Posted January 21, 2018 I'm not sure if it was archived but there used to be a thread about reducing the fps and making the trigger pull lighter on here Link to post Share on other sites
druid799 Posted January 21, 2018 Author Report Share Posted January 21, 2018 Cheers guys , time to investigate then ! Link to post Share on other sites
druid799 Posted January 22, 2018 Author Report Share Posted January 22, 2018 After further digging think clipping the spring is definitely the way too go . Seems it’s a case of slowly keep clipping and re-chrono’ing until I reach what I want . Link to post Share on other sites
Guges Mk3 Posted January 23, 2018 Report Share Posted January 23, 2018 However, that is not a good idea. The other factor your missing is temperature. Lower temps will drop FPS. Clip it to run at the speed you want at 25C and when temps drops to 15C your fps is going to be really low. Link to post Share on other sites
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