PT Xtreme. Still asking myself why. I knew they have issues especially with the pierce pin seal. Still bought it. Never could get it to work with 12 grams. Sold that junk and spent more on shipping than I netted for the gun.
BE Tiger Shark. For $20, it got me into pump paintball. But the springs are all worn out now and won't chrono over 240. And looking back, I feel like that $20 would have been better spent on a better pump to begin with.
JT ER-2. Thought it would be a fun mod project. It's just a cool looking plastic piece of junk. Just not worth the time and effort.
A bunch of Spyders. I love Spyders, but I always seem to buy another project gun with not enough time for projects.