Upgrading Echo 1 e90

[Marpat]

i am upgrading my p90 and i want to ad a longer barrel. i am not ready to open up the gun yet and this is my first time working with this system. i want to know if it is compatible with an m4 style barrel or what style i need to use. i was also wondering what other modifications i would have to do to make the barrel work right. thanks

[Orwell]

Most airsoft systems use 14 mm threads, so if you're adding an extension there should be no issues between weapon types. Suppressors work well, too. If you're talking internal barrel, a barrel is just a tube you stick in your hop-up assembly. They should be fairly universal.

[Jewish Ninja]

If your post doesn't contain solid facts, don't post anything. Guessing doesn't add to the conversation.


Any AEG cut inner barrel will work with the P90. The E1 is a clone of the TM design. To remove the barrel, separate the upper and lower. Then, take the upper and twist the hop-up and barrel until it pops out. Taking apart the hop-up is rather easy as the parts are only really held in place with friction. I'd replace the bucking and add an H-nub while you're replace the barrel.

If you're thinking about extending the inner barrel through a suppressor (which is what it sounds like you want to do, but I'm grasping at straws trying to understand your post) you'll need to dremel the inside area of the threads as there's a lip there designed to stop the barrel from sliding out.

I put an AAC SCAR can[suppressor] on my P90 which let me use a 400mm barrel. Measure the total length of the inner barrel from the end of the hop-up to the end of the can to figure out what length of barrel to use.

Can I have (wouldn't suggest as its heavy as puq)
http://www.airsoftgi.com/product_info.p ... ts_id=2709

Barrel to get
http://www.precisionairsoft.com/PCT-6-0 ... pct363.htm
If you're going to upgrade the barrel, don't get a cheap one. Upgrading a stock barrel with a cheap TBB will not produce results that justify the time, effort and expense invested.

I'd suggest getting a Firefly soft bucking (or hard if you're gun is shooting 400~) if you can find them instock/can afford the cost. Otherwise...
http://www.airsoftgi.com/product_info.p ... ts_id=3051
Yes it's out of stock, but it's a good bucking and I'm sure you can find it elsewhere.

H-nub
http://www.airsoftgi.com/product_info.p ... ts_id=4126
Helps with accuracy. It's well worth the $5

[Marpat]

sorry about the bad communication Jewish Ninja. what you described and explained is exactly what i wanted to do so thank you. and when i said barrel, i did'nt think people would actually think about putting an m16 outer barrel on a p90. thanks for the help

[Spartanacus]

Another thing to keep in mind is the type of cylinder in your gearbox. There is an ideal balance between cylinder volume and barrel volume, basically, shorter barrels need less air to clear a BB and have ports cut into the side.

With the relatively short barrel of the P90 (247mm) the cylinder is matched and has a port about 3/4 the way back. Now, if you go extreme and plug in a M16 barrel (509mm) and screw on a huge suppressor, your stock cylinder won't have enough air and you'll actually have less range and accuracy. The cylinder for an M16 has no ports, for example.

Granted, spring rate, BB weight, and a number of other factors come in to play. But since you don't want to open the gun or gearbox, don't go more than 400mm for your barrel and you should be okay.

[Marpat]

I will open the gun just not until i know what i want to do. if i did get an m4 barrel i would cut it at around 350-420mm depending on the situation at the time. what would be a good cylinder to get?