Knex MSR- 6.2 By knexaddict in LivingLEGO & K'NEX665Introduction: Knex MSR- 6.2By knexaddictFollow More by the author: About: (deleted account) More About knexaddict » Credit goes to VIPER1 for MSR- 5. Last two Pictures show a small rubber band keeping the Yellow up on the Beginning of the Barrel.