The M&P15 300 Whisper LE is a law-enforcement version of the M&P15 Whisper .300 Blackout carbine, with an 8-inch barrel configured as a registered short-barreled rifle for law enforcement agencies. Purpose-built for entry team and close-quarters operations where suppressed .300 Blackout subsonic provides hearing-safe performance without sacrificing terminal effectiveness at close range. Type: Rifle Action: Semi-Automatic Caliber: .300 Blackout Capacity: 30 Year introduced: 2015, USA Weight: 5.9 oz Overall length: 22.5" Status: Discontinued Intended use: Law Enforcement, Tactical