A 13" free-floating handguard for AR-15-pattern rifles, the Manticore Arms Transformer Rail features six user-customizable panel mounting slots (two each along its 3, 6 and 9 o’clock surfaces), that allow for the installation of any combination of the company’s KeyMod, M-Lok, Picatinny and textured polymer grip panels. They are available hardcoat anodized in black, olive drab green and flat dark earth. Price: $135. Contact: Manticore Arms, Inc.;
(630) 715-0334; manticorearms.com.