The M4-22 Redline is the first premium .22 LR semi-automatic tactical rimfire rifle born from the partnership between Tippmann Arms and Tandemkross to offer a competition-ready configuration. Featuring a fluted 16" 4150 solid steel barrel with a red Duracoat finish; a TK "Game Changer PRO" compensator; TK AR15 "hiveGrips"; 9" composite free-float handguard with red accents throughout; Mil-Spec compatible aluminum upper and lower receiver welcoming most AR-15 stocks, handguards and sights.