The trigger guard aids in the controlof the pistol when shooting the largercalibers. All Bond derringers are truepocket pistols that will shoot largecaliber ammunition. The TexasDefender will accept all the extrainterchangeable barrels.Interchangeable Barrels: Automatic Extractor. (EXCEPT FOR 9mm,40S&W,10mm and 45 ACP). Rebounding Hammer. Retracting Firing Pins. Crossbolt Safety. Spring-Loaded Cammed Locking Lever. (for a tighter barrel/frame fit and Rapid loading and unloading). Stainless Steel with Satin Polish Finish. Trigger Guard.