The Knights Armament SR-15 E3 LPR Mod 2 rifle takes the company's AR-15 platform to the next level, providing consumers with a purpose-built precision rifle that's light enough to carry with you anywhere while providing match-grade accuracy. The Knights Armament SR-15 E3 LPR Mod 2 rifle is constructed around the company's match-grade barrel, which is machined from stainless steel and features a specially built, custom-grade match chamber for the utmost in consistency. Barrel length: 18 inches Direct-impingement gas system 5.56 NATO chambering Weight: 7.4 ounces The Knights Armament SR-15 E3 LPR Mod 2 rifle also comes equipped with an M-LOK Mfg: Knights Armament