Slip-on sling options?

[Jamie]

Any recommendations from you all for a two-point shotgun sling that slips on the buttstock? I've got a Mossberg 500A and a pretty good idea of the options available for the front attachment (replacing the mag cap or putting a spacer with sling attachment between it and the tube), but I don't want to put a hole in my nice wood stock (something I would likely screw up) nor do I particularly want to remove the stock to put a spacer between it and the receiver.

I saw Specter Gear has a good (but expensive) system that includes a buttstock shell carrier, but other than that I'm not seeing what I'm looking for. Or maybe I've been looking directly at one and just didn't know it.

Primary use is for hunting, although I'd likely leave it on when it's one of the home defense options.

Thanks, gentlemen.