You can mount a magnified optic to the Aimtech Scope Mount For Remington 870 20 Gauge. You would need a set of compatible picatinny rings.
The Aimtech Scope Mount For Remington 870 20 Gauge ASM220 will fit a left handed model.
The Aimtech Scope Mount For Remington 870 20 Gauge ASM220 will only work for a Remington 870 20 gauge. If you have a Remington 20 gauge model 1100 or 1187 then you will need the model at the link below.
https://www.opticsplanet.com/aimtech-black-scope-mount-for-remington-1100-1187-20-gauge-asm120.html
Yes. The Aimtech Scope Mount should fit and function fine with your Remington.
The Aimtech Scope Mount is machined metal and finished in a satin black, Type II anodizing (typ.Mil. spec.A-8625).
The Aimtech Scope Mount For Remington 870 20 Gauge ASM220 will work on a 20 gauge magnum receiver 870 model.
The Aimtech Scope Mount should be able to fit on a Tac 14. However, I would still recommend reaching out to the manufacturer just to confirm fitment.
No, it will not.
The 12 gauge model can be found at the link below:
https://www.opticsplanet.com/aimtech-black-scope-mount-for-remington-870-12-gauge-asm2.html
Yes, it should as the receiver, where it attaches, is not a different size on the youth model.