FAQ Can any of these guns be used with 6mm paintballs? No, 6mm paintballs should only be used in cheap, gravity-fed, spring powered airsoft guns. With guns this powerful, the paintballs will explode inside your gun leaving a huge mess. Can I use metal bb's with these guns? While the CO2 powered guns are more powerful than typical airsoft pistols, they are still optimized for .2g to .23g plastic bb's. With heavier bb's, you would have to significantly adjust the hopup, and you would notice that the bb travels slower. Also, many fields have restrictions against using metal bb's in anything but sniper rifles, so your best plan is to stick to plastic. Can you ship to Canada or anywhere else outside the USA? Yes, but you must know the airsoft laws of your country. Shipping is more expensive. Please email for a quote. Do NOT bid on any eBay auctions as eBay will not allow the international sale of airsoft. Will you ship to PO Boxes? Yes, but only with USPS priority mail. UPS will not deliver to PO Boxes. Can you ship to Alaska or Hawaii? Yes, but only with USPS priority mail. I'm worried about Customs. We are located here in the US so there is zero chance of Customs seizure. If you still have a question, just send an email to sales1@co2airsoft.com and we will respond promptly.