The new Colt LE6920MP-R combines Magpul furniture with a Troy rail system. From the press release ..

Like its predecessor, this rifle comes standard equipped with many of Magpul’s most popular firearm accessories. The added benefit of the LE6920MP-R is the addition of a Troy Industries rail system. Available this month, the Colt LE6920MP-R with Troy Industries rail system and Magpul accessories gives the operator one of the most versatile and mission-configurable rifle systems available.
…

The 6920MP-R is based on Colt’s popular 6920 Law Enforcement Carbine, proven to be effectively mobile during tactical deployment and traditional patrol. This versatile M4 carbine features a 16.1” 1-7” twist chrome-lined barrel and is chambered for 5.56×45 NATO (.223 Remington). With the all-black MOE buttstock fully retracted, it measures 32.25 inches and weighs a mere 6.8 pounds. Standard Magpul accessories include the Generation 2 Rear Back-Up Sight (MBUS), MOE Vertical Grip (MVG), two 30-round Magpul Polymer Magazines (PMAGS), MOE Hand Guard, MOE-K Hand Grip, MOE Trigger Guard and MOE Carbine Stock. Also standard are an RVG fore end grip and Colt Flash Suppressor. These rifles are available with a bullet button for California compliance.