We have 2 FX Impact M4's (both 30 Cal). One is 150fps slower over 24 hours and takes 20 shots to get to the set speed, and the other one is 100fps off, and takes 15 shots to get to set velocity. Major PITA!!!
This 100+ fps drop is driving me insane - and now the distributor here tells us it’s our settings…. So I guess many of us have just the wrong settings??? Very disappointed with this M4
And one of my customers has the same issue with an M4 he ordered from me - his would be 730fps on shot one, and only 20 shots later gets to the set velocity of 900fps.