Would you mind describing or taking a picture of your sling set up?
My current sling set up allows me to switch from side to side without increasing the slack in the sling or dropping my arm out of the sling.
Ill try to get some pictures up but no promises. I will try my best to describe it. I have a QD mount on the bolt catch side of the rifle roughly an 1" in front of the barrel nut. I then loop my sling so it extends out the ejection port side of the but stock. This means that when you cross the weapon in front of you there is more slack around your neck and you are not choking yourself out.
As for the VTAC vs. VCAS I prefer the VTAC. Is is more adjustable so I can sinch it down tigher and loosen it up more than the VCAS. The adjuster on the VTAC is also much quicker, smoother to operate and easier to operate. Many people say they do not like the VTAC because of its "tail". The new models have a velcro closure which eliminates the tail. The VTAC can also be used to assist shooting positions if time and situation permits.
Pics
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