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Yes, it should fit most AR-15 rifles that have a carbine buffer tube.
Yes, the Smith & Wesson M&P Accessories Single Point Universal Swivel Sling includes an end plate to attach the sling to.
The Smith & Wesson M&P Accessories Single Point Universal Swivel Sling will not work on a Kriss Vector Rifle unless you have a sling hook mounting point. If you have a Kriss Vector Pistol with the ring on the rear of the receiver the Smith & Wesson M&P Accessories Single Point Universal Swivel Sling will work.
This Smith & Wesson M&P Accessories Single Point Universal Swivel Sling will not work on a Mossberg 20 gauge shotgun. Finding a compatible sling depends on what model shotgun you have or at least what type of sling attachment points you have on the gun. If you have swivel studs on the magazine cap and stock then the sling located at the link below will work.
https://www.opticsplanet.com/bulldog-cases-black-deluxe-padded-1-rifle-sling-with-swivels-bd810s.html
This sling is meant for an AR15 style rifle. For the MCK, you would be better with a sling like this: https://www.opticsplanet.com/caa-mck-one-point-sling.html
Yes it is for use on a carbine buffer tube that should be standard on your M&P15.
Yes this should work on that rifle.
Unlikely, even with an AR buffer tube adapter, most don't have the part below needed to keep the end plate from rotating.
The factory endplate does not have a sling mounting point on it typically. There may be some versions of the rifle that do come with a sling mount.
The endplate included will not fit the S&W M&P15-22, but the sling itself will still work with the sling loop on the bottom of your stock. This may cause the gun to hang too low however.