Recommend a "Red Dot" for HD firearm...

[jrothWA]

namely, my M1 Carbine?

Something that can be sighted in and turn-off for long period.

Mounts using Weaver mounts / base [336mount rail]

This allows me to get my Weaver 1.5X back to the shotgun where it belong.

 

[Poodleshooter]

Might want to put your desired price range up.
$30 will buy you a cheap BSA that mounts to a Weaver base. It might work, might not, but it will be cheap.
$500 will buy you an Aimpoint that mounts to a Weaver base. It will very likely work extremely well, but will cost $$$.
Lots of options in between.

 

[plumbercrack]

Here's one and a mount

Here is a link to a sight and the mount for it.

http://www.gunstuff4you.com/product/59762

http://www.gunstuff4you.com/product/59516

I loved my M-1 carbine but it was expensive to shoot