No, that is not a Screw Grip. Well, not a variant I've ever seen, anyway. Show us a photo of the spindle - looking at the face of the breech. If it is a Screw Grip, the threads on the spindle will be clearly visible in the rib extension slot. Also, the gun you show uses a tapered slot to achieve bolt to slot fit and to offset wear. The Screw Grip moves the bolt up and down on the threads. The photo below is of a Woodward marked "Proprietary" model.


Last edited by Rocketman; 03/11/08 07:08 AM.