Actually yes --
I did some pretty extensive testing today...
I took out ALL my upgrades, returned the gun all the way back to stock and tested only different cylinder bulbs. The gun is a Tokyo Marui MEU... and despite being completely stock there still is some minor problems that'll give a "weak shot" every once in a while.
Completely stock I was getting roughly 260 FPS and about 40ish shots (propane at about 19*C)
Firefly cylinder bulb I was getting roughly 267 FPS and about 36ish shots (propane at about 19*C)
ARS one I was getting about 283 FPS and about 32ish shots (propane at about 19*C)