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Not trying to be a jerk but I'd sell it. 710's have had nothing but problems and several recalls. They were discontinued because of that. I'd swap it out for a savage if your still wanting and inexpensive rifle. IMO it's not worth the hassle considering this probably wont be the last problem you have with it. Be done with it and save yourself the heartache.
Fair enough. I may have jumped the gun a little.
Also, doesn't the 710 have a plastic clip magazine? You may want to try and cycling it without that in it. Or if it just a floor plate open it up so it isn't in play. I seem to recall that those 710s had issue with the magazines.