I will always choose aluminum over plastic.
If you already have a 5.56 lower, get a CMMG upper.
If you do not have a lower or 5.56 rifle, build a lower, buy a CMMG upper, buy a 5.56 upper down the road.
Of course once you build a lower and see how easy it is, you will end up with a second lower anyhow.
The M & P 15/22 lower cannot be used for anything but the 15/22 upper.
Dave N
If you already have a 5.56 lower, get a CMMG upper.
If you do not have a lower or 5.56 rifle, build a lower, buy a CMMG upper, buy a 5.56 upper down the road.
Of course once you build a lower and see how easy it is, you will end up with a second lower anyhow.
The M & P 15/22 lower cannot be used for anything but the 15/22 upper.
Dave N



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