I hope this helps a little, since I recently had to compare LEO carbines. Our department purchased 5.56 Colt carbines(semi-auto M4 configuration with 16" barrels)11 months ago. I handled the transaction. At the time of purchase, the Colts were less than $20 more than Bushmaster or DPMS rifles in the same configuration. I believe Colt rifles have had a price increase since then(maybe Bushy and DPMS also, I really don't know), but they still hold a better resale value when you need to sale them(the complete Colt M4 upper assembly alone will sale for more than a complete LEO Bushy or DPMS carbine). We got rid of USED 9mm Colt 16" semi-auto carbines when we changed to the NEW 5.56 Colt M4 carbines, and ended up paying $59 difference. I belive that they're all very good quality, but the Colt clearly has more resale value when you're comparing LEO guns.