Gun safety seeks to instill a certain mindset and appropriate habits, or rules.
The mindset is that firearms are inherently dangerous and must always be handled with care. Handlers are taught to treat firearms with respect for their destructive capabilities, and strongly discouraged from playing or toying with firearms, a common cause of accidents.
The M4 Carbine is a family of firearms tracing its lineage back to earlier carbine versions of the M16, all based on the original AR-15 made by ArmaLite. It is a shorter and lighter version of the M16A2 assault rifle, achieving 80% parts commonality with the M16A2.
The M4 has selective fire options including semi-automatic and three-round burst (like the M16A2),
The M4 and variants fire 5.56x45mm NATO ammunition and are gas-operated, air-cooled, magazine-fed, selective fire firearms with a 4-position telescoping stock. Original M4 models had a flat-ended telescoping stock, but newer models are now equipped with a redesigned telescoping stock that is slightly larger with curvature at the end.