Shattered, by all means. Any extra feedback would be great to add to the experience base. I've used both an original as well as the repros that mt-ac and I did. It was with the lightweight aircraft gun internals that I was last trying the spring buffer, thinking it would aid in increasing the cyclic rate. I was surprised to find the opposite. Would be nice to see what you find.Huh... I've got an original setup from Doug and never tried it yet. Mebbe I'll have to try it out at the Marietta Shoot this fall.