The Leapers UTG 2-7x44mm Scout Rifle Scope has eye relief of 11 - 9.5 in (279 - 241 mm).
I would recommend using the GG&G M1A Scout Scope Mount (linked below) and any set of 30mm scope rings or a 30mm scope mount. Email us at Techsales@opticsplanet.com if you have any further questions.
https://www.opticsplanet.com/gg-g-m1a-scout-scope-mount.html
The Leapers UTG 2-7x44mm Scout Rifle Scope could be used on a Savage 110 Scout Rifle. If you have a picatinny base on that rifle the 30mm rings at the link below will work. I recommend using the medium height rings.
https://www.opticsplanet.com/vortex-pro-series-30mm-riflescope-rings.html?_iv_tube-diameter=30-mm
The mount you need in order to mount the Leapers UTG 2-7x44mm Scout Rifle Scope to your rifle will depend on the model rifle you have. If it is a Yugoslavian M48 Mauser Rifle the scope base at the link below should work.
https://www.opticsplanet.com/evolution-gun-works-yugoslavian-mauser-m48-picatinny-rail-ambidextrous-scope-mou.html
The Leapers UTG 2-7x44mm Scout Rifle Scope could be mounted on the picatinny rail of an AK Handguard. However, I recommend using a smaller profile optic such as a red dot or a prismatic red dot. The red dot listed at the link below would work well.
https://www.opticsplanet.com/vortex-crossfire-1x-2-moa-red-dot-sight.html
You can use the SADLAK BM59 Scope Mount for your M1 Garand. However, it will interfere with the loading process and only let you 1 shot load with the M1. https://www.opticsplanet.com/sadlak-bm59-scope-mount.html
Yes, this should work well for that application!
Yes, this scope should hold up against 3in slugs.
These are great entry level scopes, we've used them ourselves for plinking applications. They are airgun rated and shock resistant, so it should hold zero even if you drop the rifle.
Yes, there shouldn't be an issue.