The M4 shotgun, abbreviated as M4 shotgun, is a semi-automatic shotgun designed and produced by the Italian company Benelli. This firearm is renowned for its excellent performance and high reliability, originally developed as a tri service combat shotgun for the US military. The M4 shotgun is capable of firing 2 3/4 inch and 3-inch 12 gauge shotgun shells, utilizing a unique "automatic adjustment pneumatic operation" system to ensure stable performance in different environments. Its design includes two small stainless steel pneumatic pistons, installed at the front end of the handguard to facilitate the normal operation of the bolt action gun. Widely used in various US military units, it has proven its outstanding performance in actual combat.

Remington870 is a double barreled hunting rifle series manufactured by RemingtonArms in the United States. First introduced in the late 1950s, it is still loved and widely used by hunters and shooters today. Adopting a pump driven operation, the loading and discharging of cartridge cases are driven by sliding the pump handle back and forth. There are multiple models and accessories to choose from to meet different shooting needs. The optional barrel length, rifling type, and ammunition capacity make it a versatile hunting rifle. It can be used in various occasions such as hunting, shooting competitions, self-defense, and tactical operations. It is a classic and highly acclaimed double barreled hunting rifle