Leupold does not state the length of the Leupold STD Mounts with Rings Sets Combo Packs bases. I recommend contacting Leupold for that information.
The Leupold STD Mounts with Rings Sets Combo Packs cannot be reversed.
These Leupold STD Mounts with Rings Sets Combo Packs will not be compatible with your Sabatti. The only base we offer for your Rover 870 is the Contessa Hardened Steel Picatinny Rail which will give you a top picatinny rail and the ability to use any scope rings that work for your scope. You can find the base that I recommend using the following link:
https://www.opticsplanet.com/contessa-hardened-steel-picatinny-rails.html?_iv_code=4RH-T8-CON212-PH02&_iv_gun-model=sabatti-rover-870
The Leupold STD Mounts with Rings Sets Combo Packs will not be compatible with a Thompson Center Compass. I would recommend using a picatinny rail base and using any set of scope rings that will work for your scope. You can find the base I recommend using the following link:
https://www.opticsplanet.com/egw-thompson-center-encore-picatinny-rail-scope-mount.html?_iv_gun-model=thompson-center-compass
These Leupold STD Mounts with Rings Sets Combo Packs will no fit your Savage Rifle. I would recommend using the Talley Ruger American/Savage Rifle Scope Mount found using the following link:
https://www.opticsplanet.com/talley-ruger-american-savage-riflescope-mount.html?_iv_tube-diameter=1-in&_iv_gun-make=savage&_iv_gun-model=savage-model-116
The Leupold STD Mounts with Rings Sets Combo Pack is not compatible with a Savage Model 11. I would recommend the DNZ Products Game Reaper Scope Mount found using the following link:
https://www.opticsplanet.com/dnz-products-game-reaper-scope-mount-savage.html
For your particular setup, I would recommend using the Browning X-Bolt Riflecope Ring set. These rings are offered in a high height, allowing clearance for your objective lens, and a 1" maintube. You can find them using the following link:
https://www.opticsplanet.com/browning-x-bolt-riflecope-ring.html?_iv_tube-diameter=1-in&_iv_ring-height=high
Medium rings may be too low. Typically with a 50mm objective lens, you would want to use high height rings to allow clearance for your objective lens. I would recommend the Thompson Center 1 Piece Scope Mount Ring Combo found using the following link:
https://www.opticsplanet.com/thompson-center-1-piece-scope-mount-ring-combo-1in-medium.html?_iv_parent-tube-diameter=30-mm&_iv_code=90T-RR-1PSMRC-1082711&_iv_tube-diameter=30-mm
Email us at Techsales@opticsplanet.com and let us know what specific Winchester rifle you have. That way we can more accurately determine compatibility.
Yes, MPN: 114963 should fit.