Sterling STP (silver)
J&J Edge Barrel System
Air America Apocalypse 45/4500
Barrels are hard to come by, so the only kit I found out there was the J&J Edge Kit.
Adjustable Air System
Light, durability, consistency, accuracy
Hard to find aftermarket parts
Been playing for about 12 years, and always wanted a Sterling, but never could justify getting one. I didn't play pump a whole lot until now. There's nothing like shooting out a player with a Sterling, or even a pump, when playing against a semi or electro gun.
Extremely accurate and consistent for it's size. Build quality is top notch. Pumps are great because it requires a player to be a smarter player, when going up against semis and electro guns. If you can find a Sterling STP either used or new, you should just buy one. They are so hard to come by, and I was very lucky to get a hold of a brand new one that was probably made 8 years ago, but was never used. You'll never be disappointed with a Sterling.
When you get your first kill against someone shooting at you with a DM5, Timmy, Angel or Shocker, you'll understand.