Take some sand paper to the feed ramp on the mags, might have to get a round or half-round file to persuade it more. Then take it apart, easier than you think really. I just stripped mine down and did a few up grades to it. Look at my profile and check out the Threads I've started and posted in about rimfires for a quick instructional. All you remove is 5 screws/bolts.
DIP-www.diproductsinc.com is an outstanding rimfire website and make a few things for the 64. I bought the P-rail and Ext. Charging Handle from them. Great, solid products and quick shipping. Ordered late this past Friday and got them yesterday afternoon.
Also put a bipod on for the heck of it.

I'm newer to this site and the Savage barrel nut bug has bitten me hard! Nearly as hard as the Fender/Gibson guitar bugs!!!