I'm new to AR's but I'm pretty sure these are identical. Mistake on Palmettos part maybe?

Thanks for the help!

http://palmettostatearmory.com/index.php/16-mid-length-5-56-nato-1-7-a2-profile-without-bcg-or-charging-handle.html

http://palmettostatearmory.com/index.php/ar-15-05/barreled-upper-assemblies/psa/psa-16-mid-length-cmv-cl-stripped-upper-without-bcg-or-charging-handle.html

The first is a standard A2 (or government) profile, light under the handguard and heavy from the front sight to the muzzle.

The second is a modified A2, which is lighter from the front sight to the muzzle...this is a lighter overall barrel.

I never have liked the government profile barrels, they are light where they should be heavy, and heavy where they should be light.

I would choose the second and have a lighter upper.