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Old 02-25-2013, 09:17 PM   #11
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Wow, no doubt. That has me shaking my head. Hornaday has always been a solid brand in my use uses. Do you think this could have been a "lemon" so to speak?
I dunno. I have had some Hornaday rounds in other calibers in the past and never seen anything like that. But it got my attention enough to give a little more attention to detail with my rounds in the future.
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Old 02-25-2013, 09:18 PM   #12
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@ EW...I almost s##t my pants when you said that. I have a Bush master ar15 stamped 5.56/.223 on the receiver and that is why I figured it would shoot both types. I got it out to check and thankfully it is chambered for both 556/223. Why the hell would they stamp it on the receiver if it wouldn't shoot both rounds?

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Old 02-25-2013, 09:21 PM   #13
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@ EW...I almost s##t my pants when you said that. I have a Bush master ar15 stamped 5.56/.223 on the receiver and that is why I figured it would shoot both types. I got it out to check and thankfully it is chambered for both 556/223. Why the hell would they stamp it on the receiver if it wouldn't shoot both rounds?

AR receivers can also be stamped "multi-cal" The point being the cambering is what counts and if your manual says it can safely fire both then youre good. Check the chamber check the manuals.
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Old 02-25-2013, 09:22 PM   #14
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@ EW...I almost s##t my pants when you said that. I have a Bush master ar15 stamped 5.56/.223 on the receiver and that is why I figured it would shoot both types. I got it out to check and thankfully it is chambered for both 556/223. Why the hell would they stamp it on the receiver if it wouldn't shoot both rounds?
Cause you can slap whatever you want on the lower, .22 if you so wish. Many of them come with the "multi" stamp to be built as whatever you want. I'd imagine that a factory assembled rifle would be built to accept both. However if it was a used rifle, I'd take more care to inspect it.
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Old 02-25-2013, 09:28 PM   #15
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Ahhhh I see, I did check the barrel and it is stamped 3 MP 5.56 NATO 1/9 (twist). What does the 3 MP stand for?

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Old 02-25-2013, 09:35 PM   #16
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Its probably a B, as in bushmaster and the MP stands for magnetic particle, as in testing.

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Old 02-25-2013, 09:45 PM   #17
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Ya it almost looked like an 8 but your right it is probably a B.

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