TM p90 TR

[Dart]

UHG! I took to long typing this the first time and got logged out, well here I go again.

First off HI! to everyone in airsoft, me and my GF are just getting into the sport and are inlove with it already, I come from a tourny paintball background so there is alot of new concepts here for me.

Ok where do I start, I got my GF a TM p90 to play with. The gun seemed to shoot really well when we bought it *used*. He said it came with some upgrades. The upgrade list that I can remember were, Systema reinforced gearbox, 170% spring, m4 barrel *into silencer*, 10.8volt battery.

All sounds pretty good right? But something is not sitting well with me. First off the gun shoots at a lower RPM than my Bone stock TM ak47 does. Now with the higher voltage logic says it should shoot faster... yet it might be around 600rpm, thats even lower than stock I beleive.

Second I took the gun to my paintball buddies to have it cronoed. I was warned that the 170 spring would be hot and might have to be swapped out to a m120 spring. So I tried a pop can first, it went through both sides with a .20g BB but not the bottom *almost but not quite*. At the paintball store with a .25g I was getting readings of 260-270fps. the .20g's were lower?! at 240fps. Now this does not sound right as the 170 spring should be over 400 easily.... again... confusing yes?

So my question is why would this be happening? I hope to hell I was not lied to by a fellow AKer but I know it happens. Is there any way to open it up and tell if the parts that he said were in there actually are in there? I pulled the mech box out and its a bit beyond me... no regulator like paintball lol. Can someone guide my hand so to speak on where to look and what to try?

The gun shoots well sounds a way different than my ak47... more of a thud thud thud. Just seems like its a Supra with a blown turbo.

PS paintball ain't got shit on airsoft

[Dart]

Looks like a few views and no posts... let me know if there is any info that you guys might need that I left out. I tried to be as specific as possible.

[rjorven]

if its an old "used" pdi 170 spring it is probibly just tired, time for a new one.
and your battery wont last forever, you may need to replace it as well.

fyi i had the same problem with a pdi 170 spring, went to a m120 and would never look back, much better spring imo

[Styrak]

PDI is known to make horrible, inconsistent springs. Replace it.

[Dart]

I can get am m125 localy here how do those compare to the m120? ... gotta get beer for someone to change it.

[Dart]

alright, I took it over to someone that is alot more experianced in this than I am. He shot it a few times and says everything feels and sounds perfect. ROF is not what expected from 10.8v still but I think its cause of the 170 spring, battery is most likely getting a bit weak as well.

In the end I guess I am just being paranoid that its not working right lol. Thanks to all those that viewed this post.

[Styrak]

What size of cells is the battery made of? That might contribute to the slow rate of fire if they're crappy cells, even if it's a 10.8v.

[Dart]

battery link This is what is in it... not ment for airsoft so I do not think it has the through put that this rifle requires... expecially with that 170 spring in there. That battery is ment to spin a prop for about 8 minutes on a gear drive.... on a foam park flyer.

Me thinks I needs bigger battery.

[Styrak]

Yup, not enough juice. Not nearly the same as a sub-c airsoft 10.8v battery.

But if it works, that's fine. 1000mAh is a little low though.

[CJay]

Hmmm the fps still sounds low for a 170. Like said before I'd get a new spring. Also with the m4 barrel in there ur maybe gonna need an unported cyllinder to get the most you can from ur lengthened barrel. I don't know if u need it for the stock diameter barrel but for a lengthened tightbore it's really a must

U can check what's in it by looking at the mechbox at the top. If the cyllinder has a holein the side it's the stock ported version and u might need to upgrade.