Knex M4A1 By BAD ASS KNEX GUN in LivingLEGO & K'NEX1,1226Save PDFFavoriteIntroduction: Knex M4A1By BAD ASS KNEX GUNFollowMore by the author: DOES NOT SHOOT Step 1: Barell barell build do not need grip Step 2: More of the Barell and BodyStep 3: Stock need it Step 4: Mag and 2 Parts to BodyStep 5: You Are Done