Judging from the serial number, your gun is a Flues model dating to the 1919/20 time period. If it is a field model you just pull off the fore-end from the front.
Some of them have a pretty strong spring. Put the screw back where you found it before you begin any hard pulling. If you can feel the spring pressure, go ahead and pry it on off ( I have one I have to use a ruler on). If finger presssure won't budge it, don't pry it with anything, just take it to a gunsmith...Geo
Welcome to the site!
Last edited by Geo. Newbern; 08/15/10 06:46 PM. Reason: forgot to be polite