« previous next »
Pages: [1]

Author Topic: UTG MP5 shooting slowly (fps)...  (Read 1042 times)

Offline roughnecks007

  • Trade Count: (0)
  • Private
  • **
  • Posts: 20
    • View Profile
UTG MP5 shooting slowly (fps)...
« on: February 05, 2006, 04:42:29 PM »
Hi everyone,

I'm still a newbie to airsoft but I purchased a UTG MP5 to get into the sport and decided to upgrade as mentioned on Arnies Airsoft. The problem is that it only shoots ~230 fps after I installed an M100 spring. I am using a chrono that I know works because my Dad's shooting club uses it, and I have a friend with a KJW M9 that shoots a LOT faster. In all I have replaced the O-rings on the piston head and cylinder head, rewired it using 16awg low resistance wire and Dean's connectors, upgraded the battery to a 9.6V 1600mAh one, and installed an M100 spring I got at jungle toy. I have tested the compression on the cylinder, it is near perfect, slight leakage at the nozzle, which I expect is normal, I even disassembled the barrel/hop-up and relubed it and tested it, it is airtight, and he nozzle fits into the hopup chamber tight. I am running out of things to try, the only other thing that I can see effecting the fps would be the spring, maybe defective? If you have any insights I would love to have them, THX in advance

-Andrew-
« Last Edit: December 31, 1969, 05:00:00 PM by roughnecks007 »
Logged
Those who would sacrifice liberty for a little temporary safety deserver neither liberty nor safety - Ben Franklin

Offline PHX COBRA

  • Trade Count: (0)
  • Captain
  • *****
  • Posts: 935
    • View Profile
(No subject)
« Reply #1 on: February 05, 2006, 04:47:59 PM »
Your first mistake was buying a UTG.
« Last Edit: December 31, 1969, 05:00:00 PM by PHX COBRA »
Logged

Offline roughnecks007

  • Trade Count: (0)
  • Private
  • **
  • Posts: 20
    • View Profile
(No subject)
« Reply #2 on: February 05, 2006, 05:03:01 PM »
Yeah probably :-P but it should still work in some kind of logical fashion so I'm sure it is something I'm just missing.
« Last Edit: December 31, 1969, 05:00:00 PM by roughnecks007 »
Logged
Those who would sacrifice liberty for a little temporary safety deserver neither liberty nor safety - Ben Franklin

Offline t0ji

  • Trade Count: (0)
  • Private
  • **
  • Posts: 10
    • View Profile
(No subject)
« Reply #3 on: March 16, 2006, 04:41:36 PM »
naw your first mistake was upgrading a utg lol, I got a utg as well there good for the 100$ lol but .. not nearly qualified for a upgrade unless you redo just about everything, and then you might as well just go TM.
« Last Edit: December 31, 1969, 05:00:00 PM by t0ji »
Logged

Offline CCP9

  • Trade Count: (0)
  • FNG
  • *
  • Posts: 1
    • View Profile
(No subject)
« Reply #4 on: April 02, 2006, 09:44:44 PM »
I've just finished the same upgrade.  The UTG MP5 is an excellent platform to learn V2 mech box assembly.  I'm also having the same problem and I suspect it may be the hop up, but I haven't found a good post on adjusting/troubleshooting the hopup.  I plan on disassembling it again and see if I can adjust it.
« Last Edit: December 31, 1969, 05:00:00 PM by CCP9 »
Logged
Pages: [1]
« previous next »