Interesting, sure looks like and was advertised as a .50BMG. Its Chinese mfg Russian design.
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First off, these are NOT 50 caliber bottle openers, contrary to what the reseller/manufacturer thinks. When I received this item, I immediately knew it looked wrong because 1) the case looked too large, and 2) the headstamp on the case was like nothing I had seen before.
After researching the headstamp (which in my case shows 1066 72 or 9901 72, depending how you look at it), it turns out these are from Chinese military 14.5 x 114mm ammunition, which is more like 57 caliber. This all makes more sense when looking at the back of packaging where it says "Made in China".
And since this is a Chinese cartridge, it is NOT made of brass, but lacquered steel. It might look like a brass case, but it's just a yellow coating, probably for the Chinese military to distinguish between API, dummy, tracer, etc... rounds. If you want a real 50 BMG brass bottle opener, look for the ones Made in the USA.
As far as the bullet (the actual projectile, although most people call the entire cartridge a bullet, which is wrong), I didn't know if it was real or not. So I decided to use my bullet puller and removed the bullet from the case. Well, not surprisingly, it's fake. It's shorter, weighs less, and appears to be some kind of copper plated steel. The diameter of the bullet matches a real 50 cal, but nothing else about it is real. And I found this strange because if they're going to go through the hassle of making a fake bullet, why not just make a 14.5mm one so it seats properly instead of trying to copy the 50 cal and crimping the neck extra tightly? Maybe so they can technically call it a "50 Caliber" opener but not a 50 BMG bottle opener?
I have a picture comparing a real 50 caliber case and bullet to this Chinese variant, but I can't upload a picture to this review. Overall, if you only care about saving a couple bucks and nothing else, then go ahead and buy this Chinese knockoff. But if you want a bottle opener made from real U.S. Military 50 BMG brass and actual 50 caliber bullets, then there are at least a half dozen vendors on Amazon selling the Made in the USA version (and it's worth the couple extra bucks to support a U.S. manufacturer instead of helping the Chinese).