Hi I have got some guy telling me my umarex colt 45 fires 4.5 mm bb and that makes it legal on this site and he has offered to buy.?? For a knock down price. 😂
4.5mm is definitely not useable at any airsoft sites. I would proceed with extra caution, but ultimately as long as he's over 18 I believe he can purchase it however my understanding of the law regarding air rifles/pellets is very limited.
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