Sam at Range Time Tactical Shooting takes a look at the Mayflower UW Chest Rig Gen IV. The UW Chest Rig Gen IV is a low-profile mission focused vest built to be ambidextrous and designed to carry the following: 4 ea 5.56mm magazines, 2 pistol magazines, up to 2 small radios (PRC-152/MBITR) as well as two GP pockets.