Model 98 (Not Custom), Tippmann expansion chamber (old school design), Dye Excell Barrel, Rocket Cock, 20 oz On/Off CO2
Hard, plastic shell- insures it can take a hit. Stays on my marker nice and sturdy, and nothing, I MEAN NOTHING gets into the bolt. I like the flush cocking system, even if it does only fake it. Also, my gun has nasty habit of not liking to completely blowback every now and again, this makes a recock very easy, even in the midst of a heated fire fight.
The screws that came with it do not match the screws used on the rest of the Model 98. You will need a different allen wrench for these two screw unless you are ambitious enough to goto your local hardware store to replace them. Also, I would have prefered if it had been made out of metal as opposed to the plastic, but this is just a personal preference. The plastic performs very well and takes all sorts of abuse from me. I played rec ball for 3 years before going to fields with it, and it survived intact.
Extremely sturdy construction and a blessing to all Model 98 owners. This eliminates the need to clean your gun between every game, cuz nothing is getting in there. I once cleaned my gun, played for 8 hours, went home and opened it up to clean it again and... the gun oil was still fresh. I love my rocket cock. For $20, you can't go wrong.