I'm sure you could with the right tools. I do not know how many slots that feed uses, but you could mill down a very small rail, small enough to mount the feed, and solder it onto the barrel tube.
It would be a cool mod. Hell, if you had the means of making the mini-picatinny rail out of brass that would be even more badass. You will definitely need a detent though. Spring feeds need them to function properly.