Question, Is this the correct barrel?

[Trav84]

Hi, I never post on any of the forums but I've been reading them for a long time to get my information now I need a little help. I recently purchased a BCM 16" mid length LW upper. I can't tell if the barrel is the standard profile or a LW. I've looked every where and sometimes it can be hard to tell. Before I jump the gun I'd like some opinions from you guys. The barrel looks like a standard to me when I've compared it to several pictures. This is the first BCM I've had and only my second rifle so my experience is limited to say the least. The weight without a BCG and charging handle is 2.3lbs. Any help would be appreciated thank you.
Here's a couple of photos.

[Slippers]

Looks like the LW to me. The difference between the BCM standard and LW is forward of the gas block.

[Trav84]

Cool thank you, that's where the confusion was I thought the difference was behind the gas block.