870 clone?

George, it looks to be closer to the Mossberg 500. I don't know about the compatibility of parts though. Some detailed review info is here : swatmag.com/article/rock-island-armory-m5-shotgun/

even if its a look alike/clone parts may not fit if you want to accessorize get a Remington or a Mossberg and have a gun that will last you a lifetime