Bond Arms Cyclops, Derringer, 50 Action Express, 4.25 Barrel, Fixed Sights, Stainless Steel, Silver, 1 Round, With Trigger Guard BACY-50 AE When you fire this cannon, you'll understand why they nicknamed it Thumper! The Cyclops .50AE is the newest evolution in big bore handguns by Bond Arms. Featuring a 4.25" single bore barrel, the Rough & Tumble finish, and B6 grips, Thumper is ready to rock!