Back when I was using my M98 I did. It came with the vertical bottle adapter, and I never put a bottomline on because I liked how tight and small it was. It'll actually help keep liquid out if you're using Co2 too. Of course, if you put a 20 oz. on there like I did, the balance isn't all that great, and after a long day of play, the arm that you've held the front with is on the verge of needing amputation. Probably gives you more shooting stability though, the front's too weighed down to be affected by the recoil
I only used that marker for a short while though, and when I came to my senses I realized that a nice drop will balance a marker almost perfectly, and you can get just as tight. I'd recommend that over running it front bottling.