Here is a quick review of the Strike Systems Combat MXR18 AEG from ASG as done by EFD90 and here is the manufacturer's description... "The Strike System MXR18 Combat is a slightly shorter version of the MX/MT version. The rifle is tailored made for CQB operations and mid-long firefights are still no problem for the MXR18 rifle. Featuring a polymer body, polymer rail handguard and a metal outer barrel.