Another major improvement to the OMW Immortal kit is the seal from the tube to the breech. OMW added a 2nd o-ring to the part of the breech that pushes the plunger back. The stock Longshot internals do no have this feature. The dead space issue is also taken care of with a solid back to the piece.
When I first saw pictures of the super-sized priming grips I was not a huge fan. After trying it out I have to say it is a major improvement over the original, especially when priming a heavier spring load. I do however wish that they made the priming handle one-sided so you wouldn't have the big grip coming off both sides of the blaster. Depending on what your priming hand is you could just install it on what ever your preferred side happens to be.
What's not to love about the metal trigger? The spring is a tight fit, maybe too tight. OMW suggests just putting it on wide side to the trigger which works fine. You can also dremel down the post just a little bit, which is what I did.
For comparison, left to right:
(yeah they all look the same to me too)
The catch seems pretty much identical. The tube is also pretty much the same other than the fact that the walls are a bit thicker.
The part that holds the spring in the tube as well as the head are both more substantial with none of the cut outs you see on the sock parts. The retention cap is a bit tight on the rod but with a big spring load and some lube I didn't feel it was going to make any difference in performance at all.
Here is Jun telling us about the kit!