Originally Posted by durak
M120 spring depending on make is alot more than 320fps its bordering on 450 FPS
if your looking for 320 to 350 go with an M90. 360-380= M100, 380-410 M110
these are the speeds of modify springs in stock guns. they go towards and sometimes exceed the high end in upgraded guns. madbull, systema, and other brands of springs have different rating systems but generally near the same.
if you meant a 120% spring your closer to the mark.
woops not m120 i meant m100 for 350 it actually depends what springs you use, prometheus m100 springs shoot from about 340 fps, systema springs shoot from 365, they all vary in fps, but yes its in that general area. i did mix up the m120 rating to the percentage rating. cuz i meant 120%, PDI springs use Percentage, they shoot around 330 fps. different companies have different springs that have the m120 spring but have a different fps. m120 and 120% are completely two different ratings. =.= my bad