Agency Arms Magwell Glock 19 Gen4 No Back Strap Black 25MW-G19G4 NBS-B. These Pistol Parts by Agency Arms are machined from 6061 aluminum and MIL-A-8625 Type 3 hard anodized to ensure optimal durability and a resistance to wear and corrosion. The Agency Arms Gen 4 Magwell features a positional funnel to aid in reloads and will likely require slight fitting on reduced capacity magazines and stippled frames. However this may not be a problem as the magwell draws the hand higher up into the firearm away from the magazine follower and onto the bolt which helps with overall control. Customize your Gen 4 Glock with the Agency Arms Wide Magwell for Glock Gen 4 today Specifications for Agency Arms Magwell No Back Strap Glock 17 19 Gen4: Manufacturer: Agency Arms Color: Black Fabric/Material: 6061 Aluminum Gun Make: Glock Model Generation: 4 Included Accessories: 2 Allen Wrenches 2 Steel Fasteners and Grip Plug Condition: New Features of: Material - 6061 Aluminum Coating - MIL-A-8625 Type 2 Anodize Package Contents: Agency Arms Magwell No Back Strap Glock 17 19 Gen4 4 Allen Wrenches 2 Steel Fasteners and Grip Plug What firearm models does the manufacturer say Agency Arms Magwell No Back Strap Glock 17 19 Gen4 is compatible with? The manufacturer says that Agency Arms Magwell No Back Strap Glock 17 19 Gen4 is compatible with Glock 19 Gen 4 Glock 17 Gen 4Agency Arms 25MW-G19G4 NBS-B: Magwell Glock 19 Gen4 No Back Strap Black