That is a handy chart. I used this calculator
http://www.arniesairsoft.co.uk/?filn...s/fps_calc.htm

Barrel length effects accuracy, but not as much as buying a high-quality tigh-bore barrel.

If you want the best, Buy a prometheus barrel. They are expensive, but well worth it. You can get them from ehobbyasia.com. If you dont want to spend that much, buy a systema or a madbull barrel.

I thought an airsoft gun was like a smoothbore musket, the ball bounces around while travelling through it, tightbores excepted, so the last direction it goes is where the ball will fly

edit: oh I found a source http://www.airsoftforum.com/board/Ba...f-t152887.html

Well my G&G has decent accuracy, not as good as TM's that I've fired, but okay.
I would highly suggest getting a Tightbore barrel, Prometheus 363mm to be exact. Tightbores increase accuracy and FPS by like 10fps. Not too much. But we all know that if you're within the 270-380fps range your fine for outdoors.
http://shop.ehobbyasia.com/prometheu...551-363mm.html

I know its expensive, but its worth it.

I got this:
Whoops, our bad...
The page you requested was not found, and we have a fine guess why.
If you typed the URL directly, please make sure the spelling is correct.
If you clicked on a link to get here, the link is outdated.

What can you do?
Go Back to Shopping
Go back to the previous page.
Use the search bar at the top of the page to search for your products.
Follow these links to get you back on track!
Store Home
My Account

http://shop.ehobbyasia.com/upgrade-p...551-363mm.html

If thats too much for you, you can buy slightly worse brands in canada from airsoftparts.ca

airsoftparts.ca is the best :D

could I attach any barrel to any gun? I have never tried, except on this piece of shit from umarex

Another note, if you can afford it, don't get the REC versions. Get either the normal or advanced versions. You will thank yourself in the long run...well not really that long. ;)

is this normal or rec? are the advanced guns that much better, the m4 advanced is only $40 more
http://buyairsoft.ca/catalog/product...roducts_id=456

Sorry no username aka adam west, duplicate accounts are not allowed.