Thanks guys, I appreciate the input. I'm not overly familiar with blank shooting and have never converted a gun for such use and I defer to those of you with more expertise in this area. So when you say "erosion of the chamber", is it also possible that the far end of the receiver could be eroded by shooting blanks...or just the rear end of the barrel thats attached to the receiver... and /or the barrel developing bulges? I did not realize the risks associated with blank shooting, what else can go wrong shooting these things? Needless to say, I will never take a chance of damaging the upper. It sounds as though you cannot do both blanks and real ammo with the same set-up and not pay a price for it. I guess I'll have to wait in line for PK if I want the job done right.
Mike Hammer