I tried building a SR-15 upper for outdoor play so the fps was supposed to be above 350 with .20. It shoots about 260-270 with a .25 so that's way too low.
- RA-TECH 6.01
- Dytac 16 inch mid-length out barrel
- URX rail ( forgot manufacture
- KWA upper receiver
- EVO II Tension arms
- RA-Tech hop up unit(everything besides tension arm)
- all the other according OEM kwa parts besides the dust cover and forward assist
The outer barrel was too tight so I have to drummel out the inside to fir the hop up assembly. The valve I am using is the guarder low flow valve I think. I saw the other post about this and you guys said that there is a gas leak or a torn bucking. I dont think thats it because it has this low of an fps with both the EVO II bucking and the RA-tech bucking. If you guys want I can post some pictures either tonight or when I get back from vacation. also I get almost no hop up adjustment. I put a new bucking into my original upper that I cut the barrel down to 9 inches and that one shoots 285-290 with .25s with the same bolt, so I know I can install bucking correctly. I was think that with the same bolt and bucking but adding the RA-Tech 6.01 370mm barrel I would get around 330-345 with a .25 but it's just not happening.
thanks for any help
Edited by Migwl300, 08 August 2014 - 03:17 PM.