Unfortunately, there are not many options for upgrades, sorry

Marcus, unfortunately not finding much of anything. They do make a pistol brace adapter but with the ATF's new ruling changing the definition of a stock to include braces would require you to turn it into a short barreled rifle and require a $200 tax stamp. Here's a link to spare 25 round magazines if interested. Sorry but hope this helps, link to mag here............. budsgunshop.com/product_info.php/products_id/102369/promag+mosa1+mossberg+22+lr+715t+25rd+black+detachable

Marcus, unfortunately, there are few, if any, upgrades for the 715P.

Marcus, there are very few that are sparce between vendors : ammoaz.com/parts-gear/parts-gear/mossberg-715p-adapter-1972050 ---------------------- ALthough it looks AR ish it does not share parts compatibility : personaldefenseworld.com/2014/06/mossberg-715p-tactical-plinker-trainer-small-game-hunter/