Summit Viper Adjustable Gun Rest - Fully adjustable from horizontal to 90 degrees, the Adjustable Gun Rest attaches to the upright arms of your Summit climber using brackets and bolts. A padded front bar offers the ideal rest to steady your shot. See the list below to select the model that works with your climber. Features: Adjustable gun rest helps you steady your shot Includes zippered pad Two sizes available Model SU85251 fits the Viper SD and Mini Viper SD ** Not for use as a climbing bar. Not compatible with the Viper(R) PRO SD, Dual Threat(TM) PRO SD, or Viper(R) Steel.