IMI Defense MRS-M Modular Rail System Mid Length Black. Specifications for IMI Defense MRS Modular Rail System: Manufacturer: IMI Defense Finish: Matte Fabric/Material: Polymer Gun Make: AR Platform Gun Model: AR-15 Gun Type: Rifle Weight: 175 g Features of IMI Defense MRS Modular Rail System Made of fiber enforced polymer compound Slim cross-section Highly modular with 3 optional different side rail sections in addition to full-length completion section of the bottom rail Full length T-marked top rail Heat deflecting Anodized Aluminum heat shields and ventilation slots along the barrel Drops on with perfectly tight fit between Mil-spec Delta ring and Handguard cap QD sling mount on the bottom front end Available in Carbine Rifle lengths Fits a round end cap Package Contents: IMI Defense MRS Modular Rail System IMI Defense IMI-ZPG07BLACK: MRS-M Modular Rail System Mid Length Black