Older PGP, Tippmann SL-68II, PMI-I, SL-68, Most Tippmann markers.
PGP2K with custom "monorail" mod from http://home.rochester.rr.com/sixspgp.
Remove the plastic and replace it with a copper monorail mod.
Simple, accurate, cheap to operate.
None after Plastic parts are replaced.
Received my PGP2K a bit over a month ago...Didn't take me long to tinker the plastic parts off of it. I added my custom "monorail" mod to the gun with in 2 days. The design for the mod is free at my site http://home.rochester.rr.com/sixspgp . This really helped in making the marker sterdier. I enjoy and like this marker (PGP2K) more than the original. I have been playing paintball since 1987 and this is one of the best stock class configurations I have seen. For the money, it beats all other markers on the market.
The stock gun is very nice to shoot. It is made better with replacement parts for the feed tube to replace the plastic parts. I strongly recomend this product, especially to those who want a nice stock-class gun at a reasonable price. With a bit of tinkering this gun is better than the original PGP... I recomend it to all who read this.