PERMANENT BEAVERTAIL/BACKSTRAP:The Permanent Beavertail/Backstrap can be applied to any Gen 4 or 5 Glock frame that accepts backstraps. We seamlessly incorporate the beavertail portion of the backstrap into the frame as a permanent fixture or the entire backstrap. Backstrap must be supplied by the customer for this modification. We also suggest coupling this modification with the Razorback.  **THIS MODIFICATION MUST BE COUPLED WITH A GLOCK FRAME PACKAGE**