e90/p90

[Rentax]

Only if you don't know what you're doing.

I've worked with several P90's and many of my team members have run one at some point. They perform like pretty much any other carbine/SMG-sized AEG when comparing stock.

If you think barrel length affects accuracy that much, I implore you to go look into some of Right Hooks Fabrications rifles. Before my G36c died on me it could easily keep up with any M16 or AK47. Why? Because good consistent compression and fine tuning do a lot more then slapping a 500mm barrel on something

And if you had slap a 500mm tight bore barrel into a gun with good consistent compression it will give you better accuracy, and extra bit of FPS and in turn extra added range...

You see scientifically speaking you can't compare two things that are not the same and assume they are the same... THAT's STUPIDITY.
Saying my gun would not be better with a better inner barrel is like saying I'd be better off wiping my a$$ with my hand and then eating finger foods.

Whether you add a TB inner barrel to a crappy gear box, or a great gear box, it will help accuracy. So yes upgrading your gearbox will help with accuracy, consistency, and compression, but that is only one factor in the whole that is an airsoft gun. And yes just upgrading to a better inner barrel will only increase it's accuracy to the best the gearbox can push out, but it will help.

[Ripper]

I'm sorry, I did not realize how difficult the English language was to understand.

I got a TM P90 to play indoor/outdoor games.
I wanted the OP to know that he could check it out if we were going to the same games, and he could see what it was like.

Thanks, Though I probably wont be going to any events for a bit as school starts back up next week and I should be having a surgery here soon that will keep me from physical activity for a month or two.

[Minerva]

And if you had slap a 500mm tight bore barrel into a gun with good consistent compression it will give you better accuracy, and extra bit of FPS and in turn extra added range...

You see scientifically speaking you can't compare two things that are not the same and assume they are the same... THAT's STUPIDITY.
Saying my gun would not be better with a better inner barrel is like saying I'd be better off wiping my a$$ with my hand and then eating finger foods.

Whether you add a TB inner barrel to a crappy gear box, or a great gear box, it will help accuracy. So yes upgrading your gearbox will help with accuracy, consistency, and compression, but that is only one factor in the whole that is an airsoft gun. And yes just upgrading to a better inner barrel will only increase it's accuracy to the best the gearbox can push out, but it will help.

A 500mm barrel will perform similarly to a 363mm barrel. How was I comparing two things that are not the same? I was stating that putting a longer barrel on something will not increase accuracy. In fact it will probably bring less accuracy seeing as the BB has more time make contact with the barrel, which equates to more opportunities to veer off course. You also seem to assume that every barrel is a tight bore, which it is not. There are two lines of conjecture with barrels, one being that the tighter the barrel the more accurate the shot and the other being that a barrel with an internal diameter of 6.04-6.05mm will provide room for air to flow around the BB causing an "air cushion" effect. This allegedly causes less contact between BB and barrel allowing for a flatter trajectory and more accurate shot.

Furthermore, I did not say that a higher quality barrel will not increase accuracy. I was saying that a worthlessly long barrel will not have any differences in accuracy then one that was shorter. You'd be hard pressed to prove that the same gearboxes using different length barrels and identical hop-up configurations would cause either gun to have an accuracy advantage over one other.

[Blizzard]

Minerva, sorry, I forgot what your main point was while I was writing up my earlier reply. As far as accuracy goes, yes, a longer barrel in airsoft doesn't affect that aspect nearly as much as many tend to think. The bucking and quality of the barrel are the determining features for those variables.

BUT

A longer quality barrel does improve overall performance as Rentax mentioned: Longer barrel -> Better Compression -> More force behind BB -> More range -> Better Performance.

As an aside, I'm speaking entirely from experience. I have built ground-up 8 different AEG's, have upgraded 90% of all the airsoft replicas I have owned (30+), and worked on well over 100 airsoft replicas as a paid tech. That's not an exceptional resume relative to many of the professional techs on this board, but I have had my fair share of hands-on experience.

[Minerva]

Blizzard I did not mean to belittle you, so forgive me if I did.

Yes you can put on a longer very nice inner barrel and it will do you wonders but not so much so that it will out-range a slightly shorter barrel (within reason). Past around 430mm? (not for sure on the length) you will start to encounter problems with the volume of the air in the cylinder not being able to use the length of the barrel efficiently. Not sure if that's the case with the elongated V2 though..

[Icepick]

On a note related with the OP...

P90's aren't a primary choice for me, just because of the compact size, it makes me feel akward. Usually if you can grab a china gun, and do some work on the compression, then pick up a Madbull 6.03 tightbore, it will do pretty well. A little personal note, I wouldn't reccomend going with an Echo-1 P90, just a re-branded china gun with metal bushings instead of plastic. (Only in some cases.)

[Switchback]

akward.
Usually if you can grab a china gun, and do some work on the compression, then pick up a Madbull 6.03 tightbore, it will do pretty well.
wouldn't reccomend going with an Echo-1 P90, just re-branded

It's weird if you use it like a rifle. Move the buttplate closer to your sternum, and lean into the weapon more. That made it much more comfortable for me.

If you do get a china replica, start with a new piston, piston head, hop up unit, a TBB, and then properly space the barrel (with Teflon tape). If you don't want to open the gearbox, just work on the seal with the hop up and barrel. If you decide to leave the GB stock, then spring for a nice TBB, like a dees or something.

[Minerva]

http://shop.ehobbyasia.com/ks-p90-tr-airsoft-aeg.html

Not too bad for $80 eh?

[Icepick]

Just a slight objection to not opening the Gearbox on a China gun... You will probably not be very satisfied with the results, and will have a gun that is categorized as "meh."

What I would start with in a mechbox, is general cleaning, re-greasing, and a shim-job. (The grease and shims should cost you around $20 total.) While doing this, drop in some metal bushings and a metal spring guide if the gun doesn't already have it. Be sure that they do have those metal parts stock though, or else your budget will be raised by $20-$40 depending on the quality of parts you get.

So now your up to $40 right? Well your gun still isn't showing signs of "improvement" is it? In all honesty, this probably will not make the replica more accurate, faster, etc. But instead make it fire smoother, and boost the life by a lot.

EDIT: (More to add.) Don't go out and buy things like a new piston, piston head, silver chord wiring, etc. Just don't run a smaller battery than an 11.1v Lipo and that stuff will hold up fine. It will even hold up on a Lipo just fine, but won't last nearly as long as compared to a 9.6v, or a 7.4v Lipo.

[Minerva]

Just don't run a smaller battery than an 11.1v Lipo

Uhh... What?