The Osprey Defense Ultimate Torture Test Series. M16 M4 rifle buried with a tractor.

Watch the Osprey Defense guys bury an OPS-416 gas piston system equipped M16 M4 rifle with a huge track hoe, drive over it, squish the ground to make sure it is truly ground in dirt as much as possible, then dig it out with the huge piece of equipment, knock off some dirt and fire it. Talk about reliability!