The Spyder MR-1 was designed to be upgraded. You can add a new feedneck, barrel, On/Off ASA, stock, and trigger. However, it has been years sense its release therefore aftermarket upgrades will be few and hard to find.
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Upgrading a paintball marker can be very simple. You can change the grips, upgrade the internals, new barrel, ect. Look on such sites as ActionVillage or ANSGear for spyder- related upgrades. Also use PBreview.com to find out the quality of those parts. But keep in mind that if you decide to sell your marker, you will only get a small fraction of the money you put into it back.