Someone got car sick. A fairly new (less than 500 rounds, or about 2 months old) rifle was in the path. The good news, the Aimpoint PRO really is waterproof. The bad news, I had to completely reoil the rifle when I got home. PSA midlenght 16" 1:7 barrel, PSA A3 upper (with M4 feed ramps), CMMG lower and two stage trigger, Midwest Industries Gen 2 FF rail, Troy Industries Medieval muzzle brake, Magpul MOE grip and CTR, and a Troy battle mag.