Its realistic niche is for a designated marksman or a hunter working from a blind. The Aero Precision M5E1 is a logical development from the more basic M5 .308 autoloading rifle. It is positioned as a firearm that's practical in the field, yet more accurate and capable of sustained fire than typical hunting or defense rifles. The main upgrade is the strengthened receiver designed to give monolithic-rail effects without its logistical disadvantage, namely the difficulty of changing the forend. The area where the freefloated handguard and the barrel attach to the receiver has been beefed up relative to the typical...