I go with IR if I were you, BB novelty runs out really fast, barrel recoil add alot of realism, I can play with my nephew with ir tank while here in Australia it is illegal and dangerous to play bb around children. Not to mention HL already made barrel smoke system. With barrel recoil + barrel smoke+ red/ orange led it will be sweet. And if taigen manage to copy HL 1 track recoil it will be even better, at the moment Taigen track recoil is like earthquake.