Geissele 14.5in Super Modular RailHK Black. 5in HK Super Modular Rifle Rail is a true modular rail system that has been precision machined to exacting tolerances and fits the HK 416 and MR556 weapons platforms. Constructed of billet 7075-T6 aluminum and type 3 hardcoat anodized this Rifle Scope Rail from Geissele is made to last and withstand all of the intense recoil over time. The Geissele HK SMR 14.5in Rail features an HK barrel nut but utilizes all of the other patented features that make Geissele super modular rails the best. For a great way to make sure you are shooting with the best possible rail system for all of your needs look no further than the Geissele 14.5in HK Super Modular (SMR) Rail. Specifications for Geissele 14.5in HK Super Modular Rail: Manufacturer: Geissele Gun Make: Heckler & Koch Gun Model: Heckler & Koch HK416 14.5in Handguard Length: 14.5 in Gun Rail: Picatinny Handguard Material: 7075-T6 Aluminum Included Accessories: Standard Country of Origin: USA Gun Type: Rifle Quantity: 1 Package Contents: Geissele 14.5in HK Super Modular Rail What firearm models does the manufacturer say Geissele 14.5in HK Super Modular Rail is compatible with? The manufacturer suggests that Geissele 14.5in HK Super Modular Rail is compatible with Heckler & Koch HK416 14.5inGeissele 05-191B: 14.5in Super Modular RailHKBlack