I found my original Sporter sling the other day. Got them about 11 years ago, never put it on. Didn't seem to fit. The only way it goes on at both front and rear swivels leaves only barely enough to carry over the shoulder (old sling arms) and no adjustment. It does look like you could put the long end in the front swivel and rear loop over upper arm only and adjust both for snugging up stricly as a shooting sling and not carrying sling. Is this the way it was supposed to be?
I threw an old leather GI sling on at the time, and didn't worry about it at the time.
Are the current USMC slings usable as a classic arm snugging marksman sling or are they just a tactical carry sling?