AR 15 finding the info on the barrel under the extended hand guard

lock stock and barrel

AR 15  finding the info on the barrel under the extended hand guard,  i have two ar's and diff cal uppers other than taping a label onto them how can you see whats on the barrel???

Mobuck

First off, you only need to mark one of them if you have only two.  The easy way is to use a different color charge handle and don't take both apart on the bench at the same time. Another option would be to replace one dust cover with one that has either the caliber marked or some sort of design on it.
To ensure no mixup, we use a charge handle and magazine of same color.  One caliber is FDE or olive green and one is black or whatever you like.

mark christian

Changing the color of the charging handle is probably easiest and quickest (I find removing/installing ejection port covers to be difficult). I started out with a blue charging handle to differentiate between 300 Blackout and 5.56mm, but I quickly found out that I liked blue and began changing more parts to to that color:

The size of the suppressor is actually the easiest way to tell the difference, but a charging handle is a lot cheaper!

Mobuck

"The size of the suppressor is actually the easiest way to tell the difference, but a charging handle is a lot cheaper!"

Mark, you're making the rest of the world feel inadequate.