i didnt pay attention to what it was...just heavy, black, loud with a long hard pull...right when you think the gun is gonna fire...you realize you are about half thru the pull on the trigger...and then it bit me...not bad ...the kick was more than i cared for in a pistol....but it is just what i thought he would pick...heavy ...loud...etc...and the castings are kicked out where you feel like you should be dodging them before they hit you..that was just weird