Oops. Forgot to mention it has eight slots on the rail.
I have an Ultimak Picattiny rail that replaced the upper handguard. It works just fine with a long eye relief scope or a red dot, and if you’re concerned with such things, actually looks good.
Check Classic Firearms in their accessories. They have a gazillion parts.
Check Classic Firearms in their accessories. They have a gazillion parts. Or Aim Surplus.
Brownells is a good company, and has it in stock:
https://www.brownells.com/optics/rings-mounts/scope-bases/insta-mount-scope-bases/?sku=794001130
Numrich’s ?
I shoot my dad’s M1 carbine sighted spot on at a hundred yards using open sights. How far out do you want to shoot a 30cal round? Just wondering why you’d want a scope on an M1.
15 seconds of searching...
https://www.brownells.com/optics/rings-mounts/scope-bases/insta-mount-scope-bases/?sku=794001130
In stock.