I sure am getting anxious to hear some news about the .380 bolt. I figure my baby mac ought to be back from Sam shortly and my form 4 should be approved by March. I looked up the density of tungsten and even though I don't know exactly what steel a mac bolt is made of the weight of the tungsten is about 2.7 times that of steel so I'm thinking baby mac with an RPM close to that of an Uzi. Man that would be sweet. CF you are my current hero.