For: G&G Version 2 Spring Guide with BearingsProduct Information:
G&G v2 spring guide
well I just got this to go in my m16a4, and as the previous reviewer said, the bearings keep it from scratching the spring guide, but more importantly, they keep the tension off of the spring. Springs can shatter from being twisted too much. With ball bearings that will not happen, and you will get a slight fps increase due to the bearings acting as spacers. The rof doesn't really slow down because the spring only produces thrust in one direction; the way it is supposed to.
-G&G quality, just like the upgraded reinforced piston it will never break
-$13, seems to be the normal price of a v2 spring guide
-none, though if you choose to instal it in a JG v2 black gearbox shell, you may notice that it doesn't completely close until you use the screws to get the leverage to close the shell, this spring guide is a tight fit in clone v2s