I want a 16" Bushmaster M-4A3 with telescopic stock. However, when I look, there are about three or four different models to choose from and I really cannot tell the differences after reading Bushmaster's catalog. There is the 16" M-4, the 16" Patrolman's, and maybe one or two others. What is the difference between the M-4s and which do you recommend? Please do not turn this thread into an argument over what brand of AR is best. I am getting a Bushmaster and you will not convince me otherwise. Thank you.