The Mr. BulletFeeder Output Assembly connects the collator to the dropper and feeds the bullets into the dropper, keeping them inline and feeding smoothly. The large output assembly is required when loading 9mm, .40, or .45. The smaller output assembly is required for rifle calibers .223, and .308 as well as when loading very short, light 9mm bullets. Includes: Collator output tube Coiled feed spring (38cm long) Dropper spring cap attachment Note: The small output tube is included with all rifle conversion kits; however, a large output tube assembly is not included with a pistol conversion kit.