I've used a toilet paper core for years. Works great, and the price is right. Paint it to suit your ego. Cheers!
Yes, this has a 1 Inch tube.
The reticle is not calibrated for .223/5.56. The reticle has marks which represent the drop of a 22lr bullet. You could put this on a 5.56 AR but its not ideal.
Yes this would be an excellent scope for a MP15-22. You would need a cantilever mount for a 1 inch tube.
This has a wire reticle, not an etched reticle.
Yes this will work with that scope mount and rifle.
The P-Tactical models are the newest offerings from Nikon before they decided to discontinue their sport optics lines.
Ring height is determined by the objective lens diameter.
General guidelines for a rifle with a standard barrel that tapers towards the muzzle are:
32 - 42mm: low
44mm: medium
50mm: high
56mm: extra-high
Mark H.
Yes, it is a great option for your setup.
A low height should work. Here is a link to compatible rings:
https://www.opticsplanet.com/warne-scope-rings-w-matte-finish-41650.html