I am in the market for a 2nd Colt AR. I have a 6920 and a Bushmaster M4 A2. I have seen on Gunbroker that Colt has quit making the LEO only rifles. In their place is a SP6920 (without the LEO only) and a SP6920MP with magpul components. They seem to be about the same price. Should I go for an LEO gun or the mag pul or ??? Maybe even a 6450 9mm withthe same LEO questions? Any thoughts??