Abstract: An accessory mounting rail for a firearm, which enables mounting of firearm accessories to the barrel of the firearm and reduces the potential for parallax error in mounted sights is disclosed herein. The accessory mounting rail is formed from a complementary pair of mounting bracket sides that are hinged together and have an aperture for receiving the barrel of the firearm. The accessory mounting rail is secured to the firearm through the use of a fastener to connect the complementary mounting bracket sides, which have provided upon them accessory rails.