This Carbine Length Triangle Handguard is patterned after the XM-177/Colt 507 CAR-15 Drop-In Handguard. It features a two-piece design that easily drops in. It will require a triangle handguard cap.About 607 Colt:The 607 was Colt's 2nd "carbine" M16 after the 605 & was the first type to use a retractable type stock to shorten its length. The 607 used a 10" barrel & the first type of retractable stock, they were in Colt's catalog in 1965 listed as a submachine gun even though it fired the .223 rifle cartridge. They were never a major production model & will be found in a variety of configurations, they were superseded in 1966 by the AF GAU series & Army XM177. There was reportedly a small number bought by the Army & US property marked as GX5857, this rifle is built to replicate one of these. The replica pictured below is a legal BATF-registered semi-auto SBR (short-barreled rifle).
