Larry Vickers successfully shoots a target at 250 metres using a Glock 20 Pistol. Will he be able to hit the target at 300? Watch this episode of Vickers Tactical TAC-TV... "In this segment, from Season 3 of Tac TV, Larry attempts a drill he learned from Rob Leatham, the Walk Back Challenge. He uses the Glock 20 in an attempt to hit a full-size MGM Silhouette from 300 meters."