Old Elementary: Eero Okkonen's ball turret and deltoid | New Elementary: LEGO® parts, sets and techniques
Modded Republic Gunship (Turrets, Doors, Other Accuracies) : r/lego
Brickmania 2183 B-17G "Flying Fortress" WWII Heavy Bomber [Review] - The Brothers Brick | The Brothers Brick
Old Elementary: Eero Okkonen's ball turret and deltoid | New Elementary: LEGO® parts, sets and techniques
NEW Lego Trans Glow In the Dark 3x3 BOWL - Minifig Round Ball Turret Hemisphere | eBay
Lego Cylinder Hemisphere 3 x 3 Ball Turret with 2 x 2 Base 44359 44358 | eBay
LEGO Part 44359 Cylinder Hemisphere 3 x 3 Ball Turret [Dark Orange] (4188540) | iBricktoys: LEGO shop guide and database
Erco ball turret on a Consolidated PB4Y-2 Privateer, Pima Air & Space Museum (photo: Paul Woodford) | Air and space museum, Aerospace museum, Republic gunship
Cylinder Hemisphere 3 x 3 Ball Turret Socket with 2 x 2 Base : Part 44358 | BrickLink
Cylinder Hemisphere 3 x 3 Ball Turret : Part 44359 | BrickLink