After the production of the Barrett 50 Cal. and Dragunov, L-Brain Sidework scurried to make a new sniper rifle weapon. It was made to decimate anything in sight, hence the name "The One Punch Rifle". It turned out to be an incredible success and was perfect for piercing armor and destroying whatever needed be. Soon survivors everywhere were discussing the new rifle, and L-Brain Sidework was back in business.
Unfortunately, the Once Punch Rifle turned out to be a modified and reskinned version of a previous model; the Remington 700, however this only made it more reputable.