I'm sure it could be done, but I don't think it would be a good idea. I started shooting Glocks in 1990, not an early adapter by any means, but I've had a good bit of experience with them by now. And I definitely would not want that trigger, with no external safety, on any 870 I was using. But then, I've been shooting 870s for a lot longer than I've been shooting Glocks, and I'm completely comfortable with the 870's trigger plate design as it is. And it bothers me not at all to keep them stored with an empty chamber until needed. When I pick up the shotgun I chamber a round, when it's waiting for use, the chamber is empty.