IBO Speed Brace Height Let Off Mass Weight Axle to Axle Draw Weight Draw Length Kinetic Energy up to 320 FPS 7 9/16” 80% 4.0 lbs. 33 7/8” 50# 60# 70# 25 - 30” 79.6   Back for 2010, the APA Viper continues to deliver. This aptly named, compact bow is coiled up, ready to strike. Designed for hunters who need the short axle to axle for ground blind or tree stand hunting. Complete with past parallel limbs to totally eliminate shot vibration, the Viper is a guaranteed hit.   * View Special Edition Viper * View Available APA Target Colors * View Camo Pattern Swatch