The Benelli M4 Entry is a 14-inch barreled variant of the M4 designed for confined-space law enforcement use. Requires NFA registration as a short-barreled shotgun (SBS). Used by specialized entry teams where the standard 18.5-inch M4 is too long for room clearing. Type: Shotgun Action: Semi-Automatic Caliber: 12 Gauge Capacity: 5 Year introduced: 2005, Italy Weight: 112 oz Overall length: 35" Status: Active Intended use: Law Enforcement, Military, CQB