Did a T&E several years back.
Took several months in the field, involving more than 100 troopies, and half a dozen different slings and mounting solutions.
The clear winner was he one with the Patent, that the others have copied poorly.
GRSC CAR-A.
Currently have a large number of rifles in daily use, 24-7, under less than optimal conditions with the CAR-A and sling attached.
The only issue is minor, and involves another vendor.
Service at GRSC is first rate, personal, and cheaper than with the others to boot.
The thng is out of the way, does not bend during abusive use ( the GG&G units DID!), the finish does not succumb to environmentals any faster than the finish on the rifle, and after mounting a large number without finding a single abberation in dimension, I feel comfy to state thet they are the best on the market.
Have a Prototype slot and hook model on one M4 that is getting beaten up weekly.
if this one becomes production, it will be a winner all around.
The outside radius of the thing dosn't "Dig" and snag on the snivel gear, and allows access to the forward assist.
Can't say the same for the others.
S-28