Big Dicks Have A Spares Kit i beleive they're inculded in that along with the springs and screws 
hope this helps ^^
http://www.bigdickspaintball.com/cgi-bin/sh000000.cgi?REFPAGE=http://www.bigdickspaintball.com/&WD=promaster&SHOP= &PN=Spares-Seals-Lube.html#a1_2193#a1_2193
hope this helps ^^http://www.bigdickspaintball.com/cgi-bin/sh000000.cgi?REFPAGE=http://www.bigdickspaintball.com/&WD=promaster&SHOP= &PN=Spares-Seals-Lube.html#a1_2193#a1_2193