Ultimate Arms Gear Glock Original Beavertail Modular Backstrap Replacement Kit Glock 29 & 30 Gen 4 Pistols 3/32 Pin Punch Gunsmith Tool Package Includes: Glock 30822 Beavertail Modular Kit + Ultimate Arms Gear Pro Disassembly 3/32 Pin Punch Armorers Gunsmith Tool Fits: Glock 29 & 30 Gen 4 Pistols. Polymer Construction. Includes: 2 Beavertail Backstraps + 2 Standard Backstraps + Trigger Housing Pin + Installation Tool. The Glock Beavertail backstrap kit is a factory replacement for Gen4 pistols. These parts are factory replacements, made to the same specifications as the originals included with your pistol. These are perfect for replacing lost or worn panels. Ultimate Arms Gear Pro Disassembly 3/32 Punch Armorers Gunsmith Tool Designed to Punch Pins. Features a Polymer Handle and Steel Tip for an Ultra Durable High End Tool. Diameter is 3/32 of an inch or 2.5mm.