I am with Nukin here. I can pull a mag and reload faster than you can grab a second gun. Good practice makes a good performance! Being a non-leo, I try to keep it simple. Less hassle and a second mag helps balance the weight of the gun.magazine. either way is good, but with proper training it is much faster, smoother, and natural to drop and swap magazines then reach, unholster, identify, target, and fire.