You cannot go around changing the firing rate of weapons. I recently bought a m4, it had good firing rate everything was fine, until 5 days ago when I found it was slower. I purchased the weapon at a fast shooting rate, and I either want a full refund on my m4 or for you to change it back.
By the way, your only doing this for us to spend more money on the sten or Thompson, not at all fair considering I wasted money on my m4.