Well finally got around to installing this kit. I must say, I am disappointed, OMW. This is not a drop in kit at all and needed a lot of modding to make it work smoothly.
Let me see where should I start (I'm sure many of you have heard about the issues already, I'm just going to back them up)
- Barrel fit was fugly. Had to sand and dremel it so it would seat correctly.
- The hammer did fit right. Had to sand and dremel the guide so it would be able to engage.
- Trigger, well it sucked. The rubber coating on mine was peeling and it would get stuck when you pulled the trigger. Had to remove the peeling rubber and trim the trigger to make it work. Winding the trigger spring was not the fix to my issue to increase the return.
- The barrel, well after I initially put it all back together the performance gain was negligible. barely 80fps with new darts. I ended up drilling the barrels out and now it gets full air flow and gets avg 92fps. Much more respectable. And the AR is still intact and functioning.
- The foam that sealed the barrel to the AR was damaged due to the tight tolerance gap between the new barrel and AR. I had to repair it with some E6000.
All in all, this kit needed work. After all the tweaks I did, it's a much happier blaster now. Here is the updated pic of the barrel and install.

Nice to have 6 shots though. I think I'm going to have to throw this on Ebay.