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Upper ???

886 Views 6 Replies 4 Participants Last post by  Quentin
I bought a S&W M&P 15 in 5.56 and wanted to ask about what other uppers would fit on this gun? The reason for asking is that the 5.56 ammo is getting hard to find and is pricier than .223. If I would buy a less popular caliber that costs even a little more I will be able to find ammo more readily available.

I already have a M&P 15-22 so I don't need a .22. What is out there that won't make the ammo too much but more available?
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I'm finishing a build in 300 blackout. Ammo isn't much more than some .223/5.56 but it is slightly hard to find. I agree with Quentin on sticking with .223/5.56
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