I just received my 16" med-con upper and assembled my carbine. Everything went together as-expected. I wanted to take a look at the barrel so I took the handguards off - that's when I realized there is not the first marking on the barrel - not 5.56, not 1/7, not nothing. I was somewhat disappointed in this and its not really a big deal, but even Olympic puts the caliber on the barrel.
SORRY, CMMG. THE BARREL IS CORRECTLY MARKED

My cmmg barrel is marked. It's a 14.7 inch m4 barrel. Bottom side of the barrel under the handguards. It says cmmg mp 5.56 NATO 1/7

I'll be damned - it IS marked! My apologies to CMMG. I was looking at it in room lighting and the roll mark is lightly struck. In todays bright sun it jumped right out. Thanks a million for the tip.

Seriously?