Decent, at best - FAB Defense M4 Buttstock for Remmington 870

I ordered the shock absorbing buttstock, but there is almost no shock absorption at all. The recoil is still manageable enough to be able to rapid fire in succession while relatively staying on target. Buttstock was easy to install, even though it didn't come with instructions for any of the assembly or description of additional parts(?) that are not being used. Grip and adjustable stock are ergonomic despite lack of shock absorption.