I'm sure that you have a lot more info available to you because you're in the industry, and I won't try and dispute it. All I know is that if I go to the Viking Tactics website and click on VTAC sling I get the following:
Viking Tactics Original Sling
CODE: VTAC-MK1
NSN 1005015344359
GSA# GS 07F 9236S
PRICE: $34.95
COLORS: Black, Coyote,
Foliage Green, Blaze Orange,
OD Green, Multi Cam
Now maybe this is marketing, but they list both an NSN and GSA number. Would these not have to be Berry amendment compliant to be sold to US agencies? I honestly don't know so I'm throwing it out there to an industry expert.
Both Midway and Officerstore list the VTAC sling as Berry compliant, I imagine they'd get in a lot of hot water for misleading agencies that must purchase Berry compliant gear. The prices are the same as regular VTAC slings so I'm not convinced they are special order.
I did find this on the Viking Tactics website:
"American Made: Viking Tactics, Inc. provides American Made products at every opportunity. Contact Viking Tactics, Inc. to purchase Berry Amendment approved slings. "
I don't take that as necessarily meaning they must be special ordered, perhaps some of the slings aren't compliant, perhaps Real Tree camo fabric is imported for example, I don't know. I've sent out an e-mail to them to see if they can clear it up.
You say you were pointing out differences, and they are different, but you try and say that they're made in China, which they are not. I'm not a fan of people making misleading statements about others products to make their own look better. I like both the VCAS and the VTAC but sometimes prefer one over the other depending on what I'm doing. Is the tail annoying? Subjective I'm sure, can't say that I'm a fan but I've never had it get caught or impeed my ability to use my rifle. I do appreciate the fact that I can cinch it down tight to the body for instances when I have to climb over obstacles or rappel.
I find it interesting that some VTAC products could be made in Canada but I've not found any references to this.
ETA: Who went full retard?