The manufacturer doesn't provide the length of the main tube of the Bushnell Banner 3-9x40mm Rifle Scope. I recommend contacting Bushnell in regards to that information.
The Bushnell Banner 3-9x40mm Rifle Scope could be used on a Marlin 1894 .44 Magnum. Just ensure you have a compatible scope mount and rings.
The Bushnell Banner 3-9x40mm Rifle Scope can be mounted to a Ruger American Rifle. I recommend using the 1" diameter medium height Leupold PRW2 Rifle Scope Rings located at the link below.
https://www.opticsplanet.com/leupold-prw2-riflescope-rings.html?_iv_tube-diameter=1-in&_iv_ring-height=medium
The Bushnell Banner 3-9x40mm Rifle Scope will work well on a 22 MAG Rifle. Just ensure it is mounted properly, with the correct rings.
I am not sure there is a sun shade made specifically for this scope. I would look at these bushnell scope covers because they will hang over a little bit given some shade:
https://www.opticsplanet.com/butler-creek-eyepiece-flip-open-scope-covers.html
The field of view specs posted by Bushnell states (Ft @ 100 yds) - 32 ft. @ 3X to 11 ft. @ 9X.
Yes. You have several options to mount the Bushnell Banner 3-9x40mm Riflescope. If you already have a picatinny rail on your rifle, you will only need scope rings that mount to picatinny to fit the scope. If you do not already have a picatinny rail on the top of your rifle, you can purchase an aftermarket rail adaptor that will put picatinny on your rifle. At that point you would get scope rings and be all set. The last option, is if you don't have a picatinny rail on your rifle, you can get scope rings that mount directly to the rifle and allow you to mount the scope. I would recommend low height rings. Links to these options will be left below.
Remington Model 783 Picatinny Rail - https://www.opticsplanet.com/leupold-backcountry-picatinny-rail-remington-783-cross-slot-s-a-1-piece.html
Low Height/Direct Fit Scope Rings - https://www.opticsplanet.com/talley-lightweight-alloy-scope-mounts-for-browning-howa-remington.html?_iv_gun-make=remington&_iv_gun-model=remington-model-783&_iv_ring-height=low
Bushnell states that This Scope is perfect for high-recoiling firearms due to the extended eye relief it provides. It has been tried and tested on a multitude of different calibers without fail.
Yes. The Bushnell Banner 3-9x40mm Riflescope is perfect for high-recoiling firearms including shotguns, and offers 6 inches of eye relief to be useful on a multitude of different platforms.
This scope does not come with rings. The flip cap you need for the eyepiece is: BX-R2-ECOVERS-MO20180 and the objective is:
BX-R2-COVERS-30280