Quote:
Originally Posted by ujiro
Wouldn't that cause an extremely large drop in the muzzle velocity though (if using 6mm in 8mm barrel). You would no longer be getting any seal between the BB and the barrel, and as such the bulk of the gas flow would just fly right around the BB, still propelling it forward, but not nearly as quickly as before.
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he wanted to use 6mm in a 12 guage barrel... so i don't think it's be any worst to use 6mm in 8mm barrel, and plus, the inner barrel suggestion is for just making the gun incapable of firing life shells.