|
|||||||||
|
Home | Forums | Register | Gallery | FAQ | Calendar |
Retailers | Community | News/Info | International Retailers | IRC | Today's Posts |
|
Thread Tools |
August 1st, 2006, 01:53 | #1 |
TM MP5 - Low velocity - FIXED
Hey guys, I need some help with a problem I'm having but first, here's the stats of the gun.
TM MP5A4 HG M120 Spring Metal bushings Poly Carb Piston Poly Carb Piston head Metal Spring Guide The problem I'm having is that the gun is only shooting at 150fps with the current modifications. Before the upgrades were installed, the gun was shooting 285fps on average. I can't figure out what the problem might be. I've replaced the O-ring on the piston head, I've tried 2 other springs (an M120 and a stock one) with the same effect of 150fps. The nozzle is also fine. I guess what I'm asking is, what's the next step? What else do I need to try to get this thing working again? |
|
August 1st, 2006, 02:03 | #2 |
Did you change the piston head seal at all?
Also the cylinder might be to big for your new piston (had it happen with a hurricane kit I bought) Did you check to see if your hop up rubber is not folded or creased. I love fixing my own stuff like most but sometimes after trying for a while you might want to seek the help of a proffesional before doing something you regret and make a $500 paperweight. LOL GOOD LUCK MAN!!
__________________
-TM AK Beta Spetz -TM MP5 SD5 -TSD VSR10 -Ares G39C -A&K Tan Magpul Masad -We Tech M9 Tac Masterling -1Tornado Impacts V2/3 Gun Doc and BA experience |
|
August 1st, 2006, 02:08 | #3 |
Is the cylinder in the correct way, with the port towards the rear of the mechbox?
__________________
Age verifier Northern Alberta Democracy is two wolves and a sheep discussing what's for dinner. Freedom is the wolves limping away while the sheep reloads. Never confuse freedom with democracy. |
|
August 1st, 2006, 02:13 | #4 |
Hop-Up is in working condition and the O-Ring on the piston head is making what appears to be a good seal with the cylinder walls.
I'm fairly familiar with the internals of the MP5 series as I have owned 5 of them through out my career. Also, just for information more than anything, I have taken it to a gun doctor and he has no idea what's going on either. Everything "appears" to be fine. |
|
August 1st, 2006, 02:17 | #5 | |
Quote:
|
||
August 1st, 2006, 02:20 | #6 |
If it's to the front then it's wrong. You lose about 2/3 of your available cylinder volume and alot of FPS as well.
__________________
Age verifier Northern Alberta Democracy is two wolves and a sheep discussing what's for dinner. Freedom is the wolves limping away while the sheep reloads. Never confuse freedom with democracy. |
|
August 1st, 2006, 02:36 | #7 |
What I do is I take the cylinder, piston, air nozzle system out. Then I take my finger and plug the airnozzle so no air can escape. If you push the piston forward and there is no air escaping then its a good seal. You can use this method to determine if your piston is pushing enough air. Try different levels of force to the piston too.
If your getting low fps i would also look at the air seal in the hopup. Otherwise it might be the spring. *shrug* Can't really tell without looking at it myself. Hope that helps
__________________
|
|
August 1st, 2006, 02:54 | #8 | |
Quote:
|
||
August 1st, 2006, 02:55 | #9 | |
Quote:
|
||
|
Bookmarks |
Thread Tools | |
|
|