I am looking for a good M-4A3/AR-15A3 rifle. Please list the brands and models that fit the following requirements: telescopic stock, flat top receiver or (preferably) removable carry handle, 16-inch barrel. By the way, I am particularly interested in the Colt models. I have been looking on Colt's website, but it sucks. I know they make rifles that fit my requirements for civilian use, but the site only shows one model. So, please list the MC6..... model number. Thanks.