Daniel Defense DDM4 PDW is a purpose-built SBR with 7-inch barrel and folding/telescoping stock. Requires NFA tax stamp. Type: SBR Action: Semi-Auto Caliber: 5.56x45mm Capacity: 30 Year introduced: 2018, USA Weight: 58 oz Overall length: 18.75" Status: Active Intended use: Military / law enforcement / personal defense