MRP ISCG AMG All Mountain Chainguide Review Posted by GiantPandaisy June 1, 2018 in Drivetrain Components Weight: 120g Weight: 120g Weight: 120g From the Manufacturer Weight: 120g. Designed to be paired with Shimano Shadow + or SRAM Type 2 rear derailleurs. The removal of the lower guide pulley increases efficiency while reducing noise.. Cycling MRP Outdoor Recreation Parts & Components Sports & Outdoors