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So bring my front QD back towards the receiver to the last keyhole, then move the buckles all the way down the strap to the QD?
Is this mutually exclusive of running the rear QD off the end plate?
It's a BCM end plate, the QD socket protrudes a little bit.
When you run your rear QD off the end plate, where is your front QD?
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You're pretty well set up, then. You could even leave your front QD where it is; it depends on how you find it comfortable and your ability to cinch the rifle snug against your body when in a non-firing profile (e.g., walking); I tend to find closer to the front of the receiver more comfortable, but not always.
I have found that I prefer the end plate sling mount because it allows me to move quickly into a single-point mode while shooting and then backt o two-point while carrying the rifle. This is enhanced by using something like a sling-mounted QD (e.g.,
Burnsed Socket,
Tri-Glide).
It does add an extra step but it works surprisingly well. And if you don't have time to get into a single-point mode, you can stick with a traditional Vickers-type move where you quickly create slack in the sling and slip your arm through to quickly shoot. Either way, having the rear sling mount at the end plate will allow you to transition to your weak side with less tangling, etc. Single-point mode just keeps the rest of the sling out of the way from your other controls (e.g., bolt release, changing mags).
The only downside to the end plate mount is that, with the rifle cinched up against your body, the stock is super close to your face. So, it's present should you have to turn your head in the same direction. Mounting the rear sling QD on the stock, as you have it pictured, deals with this problem.
So, everything's a tradeoff but in my experience the end plate QD mount gives me the most balance for my uses. That said, having QD on the end plate, hanguard (at your desired location), and stock gives you a lot of options.