Because of a different inner barrel position inside the hopup, this unit require inner barrels at least 3 mm shorter than the “AEG” hopup unit equipped with the same outer barrel to avoid inner barrel sitting out of the outer barrel.
- “510” outer barrel requires a 507 mm GBB inner barrel
- “420” outer barrel requires a 417 mm GBB inner barrel
- “330” outer barrel requires a 327 mm GBB inner barrel
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