Let me start off by saying that I do not personally know z.bart, so this is my honest opinion of the product. I posted in his thread saying that I wanted to test his pump kit, and he decided to would make a good tester.
This is his undercocking kit for phantoms that is currently in the testing phase, so it may not be exactly what the finished product will be like.
The box i recieved came with:
and a screw.
The first thing i noticed was the spring was awful for this pump kit. The way he designed it was for the spring to go inside the handle, but the width of the spring was too big which caused internal rubbing making the kit not smooth. I was fortunate and had an extra spring that fit over the guide rod which helped out tremendously.
Luckily for z.bart, that is the only real flaw i could find with this kit (i wouldnt even really call it a flaw because its a $1 fix...).
Everything else about this kit i loved.
The shape and construction of the kit is great. I took off the stock pump kit and compared them side to side. Both of their heights are about the same, but z.bart's kit is slightly wider which makes it feel great (especially for people with bigger hands). The little indents on the side remind my of the PMP pump kits for autocockers. This little indent provides great grip and really helps the handle conform to your hand.
The material that it is made out of is some composite. It is nice and light, but also feels very durable. The only downside i see with the material right now is that it leaves machine marks, but maybe a light sanding with fine grit paper will do the trick. This is probably going to be something that z.bart takes care of in the production models.
The guide rod is pretty standard. It bolts onto the body right where the front screw would go. It was somewhat tricky to get it on when trying to assemble the gun, but i found that using electrical tape to hold it in place make installation a breeze.
The most important part, and probably most impressive, is the stroke. After installing this pump kit my stroke went from being a typical phantom stroke to an almost sniper stroke (lets call it a heavily sprung sniper stroke). It is extremely smooth, yet has a nice snappy action to it. The only problem with the stroke is that it can twist since there is no guide rod. But as long as you can pump a sniper without a guide rod, you can pump this easily. This is actually easier than pumping a sniper without a secondary guide rod. Usually if you twist a handle as hard as you can and then try to pump it is very difficult, but with this you cant tell a difference. So in that sense it has a leg up on a snipers pump stroke.
That is pretty much my review for this kit. Aside from the little spring issue there is little that i would change. The only thing that i might think of adding would be a secondary guide rod, but in reality it doesnt even need one. I look forward to seeing the finished product!
As a little disclaimer, i have not had a chance to try many other undercocking kit for the phantom. I have tried the wevo kit, which seems to be one of the more common ones, and this one feels much better than wevo's kit.
Now for the pictures:
Feels great in hand
Needs a different spring
I will post up what i think when i have had more time to use this and if anything changes.