The P415 AR-15 Mod Rail from Patriot Ordnance Factory is specifically designed to fit POF USA upper receivers with a mid-length piston system and will not work with other upper receivers. It provides a monolithic 14.5" rail system. The rail system is constructed of aircraft grade aluminum and hard-coat anodized black. POF-USA does not recommend that this system be installed on rifles with barrels shorter than 16.5".
Specifications and Features:
Overall length 14.5"
Hard coat anodized
POF USA upper receivers with mid-length piston systems ONLY