If you use a rotary magazine these are the BB's to use. They're very true to size 1.77/45mm and stay lodged in a rotary clips. When using Crosman copper tops two out of 10 BBS would fall out as soon as I turn the clip over as they were smaller than the others. Not so with these guys. I've shot a bunch of Horndy Black Plated BBs and never had one fall out of the rotary magazine yet. Highly recommended.
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