I have an Invictus and King Competition chest rig. The Invictus is easy to load shells and pulls easily, but the shells can become dislodged if bumped. The King was expensive, but is an amazing chest rig, it holds the shells with great retention, but pulls super easily, I have gone prone with the king chest rig on and didn't lose any shells. The Invictus strap is easy, to get on and off, but can shift up and down if not super tight. I mounted the king to a Molle chest rig, and it takes a second to get on, but stays put while running and gunning. Hope this helps