Brown Dog , Len,
I am fortunate in that I had to pay for my AI sling - the full £45, as I don't get my toys for free!
Iv'e just taken a few (rushed)photo's of the attachment points on the sling and of the quick release center strap arrangement.
Hopefully this will show the sling in greater detail.
It is a very good idea, I've used mine for a couple of months now and have come to the following conclusions:
The attchments will fit any rifle that has a harris quick release sling fitting - I am not sure about the Mcmillan dish type fitment, but you should get a good idea of relative sizing and space required from my pictures.
There is quite alot of "slop" bettween the attachment point and the harris swivel, it causes the rifle to move on your back without warning and with this movement, one hears a "clack", easily rectified by wrapping the clip and swivel in electrical tape - I havent got around to doing this yet, but will asap.
If you are a larger frame (I'm just under 17 stone and 6ft tall) the sling is a little difficult to put on and requires a certain technique to put it on comfortably in one movement, once you aquire this skill, there are no problems.
With the aid of the quick release clips in the middle of the sling, if you come accross something whilst the rifle is in the full carry position (on your back like a rucksak) it is easy to release one side quietly and remove the rifle rfrom your shoulder like a normal one sided sling.
Would I recommend this product - yes, but it requires you to accept that you have to "live with it" to be able to use it properly.
Hope this explanation is clear.