Caliber: 5.56 NATO. Signature Series rifles are designed by well-known names in the firearms industry. John Lovell of the Warrior Poet Society designed the WPSM4A1. Heavy-duty RIS III rail, Holosun 515 GM, Unity FAST Micro Mount pinned and welded Surefire Warcomp. Radian Raptor charging handle, Radian Talon safety and Railscales components, OD Green Cerakote. Geissele SSA trigger, WPS Rifle sling, signed copy of the Warrior Poet Way, a custom challenge coin, matching hard case. Barrel: 14.5-in. M4 barrel profile. OAL: 31.5" to 34.5". The model was introduced in 2024.