Good choice?? It depends. It will work fine, no problem. The airmax line is springer rated so you don't NEED to use anything other than less expensive ordinary rings. The thing to consider if you use other rings is ring height. I just looked at the Hawke website and if yours is the 50mm objective you will need high rings.
ETA- stupid me, you just said it was 40mm, duh! Medium rings will work but it depends on how you hold your head when you shoot. If you are used to holding your head more upright then you may be more comfortable with high rings. If you are used to leaning your head over more then mediums would work fine. Medium will keep the scope closer to the bore so there will be less hold over/under to deal with, but I think that is secondary to being comfortable in your hold.