OLL 13 algorithm: Gun, Trigger
OLL (orient the last layer). Group: Knight move shapes.
OLL 13, Gun: yellow stickers on the top face: left edge, centre, right edge, front-left corner. Yellow stickers on the sides: back face, left, back face, centre, right face, back, front face, centre, front face, right.
The diagram shows the cube from above with the front at the bottom and yellow on top.
Algorithm
r U' r' U' r U r' F' U F
10 moves.
Other algorithms
F U R U2 R' U' R U R' F'F U R U' R2 F' R U R U' R'y2 f R U R2 U' R' U R U' f'
Source: www.speedcubedb.com