Don't let the name fool you! This gun is not, in fact, greasy or capable of spewing grease. But then again, it is a toy, and therefore your imagination can kind of take it where you want. Anyway...this custom LEGO gun is actually based on the M3 submachine gun, a .45 caliber gun adopted for use in the United States Army prior to our involvement in World War 2. This gun has a pretty distinct look to it- kinda like a Sig Sauer and a TEC-9 got together and things got weird. If you pick up one of these, be sure to check out the rest of our United States WWII accessories!