美国LaRue战术公司OBR(Optimized Battle Rifle,优化战斗步枪)是一款基于AR10系步枪结构的高精度半自动狙击步枪,发射7.62×51mm NATO步枪弹。该枪采用导气管式导气系统,重型比赛级枪管,枪口加装有消声器,平时可用帆布制消声器套加以保护。机匣顶部及护手上下方均设有皮卡汀尼导轨,护手左右两侧预留了皮卡汀尼导轨安装孔。枪托上方的贴腮板前后可调,枪托下方设有皮卡汀尼导轨用于安装单脚架。该枪有406mm、457mm和508mm 3种长度枪管可供选择,图中的OBR狙击步 The OBR (Optimized Battle Rifle) by the American LaRue tactical company is a high-precision semi-automatic sniper rifle based on the AR10 series rifle structure and launches a 7.62 × 51mm NATO rifle. The gun with air-guided air conduction system, heavy-duty game-level barrel, muzzle muffler installed, usually available canvas muffler cover to be protected. Pitottini rails are located on the top of the casing and on the upper and lower sides of the hand guard, Picatinny rail mounting holes are reserved on the left and right sides of the hand guard. Butt plate above the butt is adjustable front and back, Picatinny rail below the butt is used to install a monopod. The gun has 406mm, 457mm and 508mm length of 3 kinds of barrels to choose from, the picture of the OBR sniper step