Rifled Rocket motor (large)

57mm long 20mm wide medium to large rocket motor, rifled inside to draw the combustion to center of motor, extruded blast nozzle to keep the motor repellent small for max velocity,

as the motor shrinks from scorching the velocity gets higher within the motor.

please be careful with this i will not be responsible if some one blows there hand off,

do not pack it to much due to can explode, happen to myself, fill up half of the way, put a wading inside, put the cap upside down in the hol