you use a 407 mm inner barrel for an outer barrel like this

If you don't want to use them

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Comes in a practical case that also contains polish and a leather strap for sharpening the knives

Maple Leaf Macaron AEG Hop up Gummi gas you use a 407 mmMaple Leafs Maracon is one of the most popular hop up rubbers. With their unique flat inner nub, they provide consistent pressure for maximum precision. Fits TM spec AEG barrels. For optimal rubber selection, follow this table: 50 degrees = <110 m s 60 degrees = 90 120 m s 70 degrees = 110 140 m s 75 degrees = 130 150 m s 80 degrees = >150 m s