Tightbore vs. cylinder matchup? Huh?

[incrediboy729]

Hey guys.
I am wanting to purchase a prometheus tightbore for my CA m15a4 carbine (the collapsible stock one). http://www.airsoftgi.com/product_inf...oducts_id=1584.
While researching on which one to buy I came across a reviewer on another barrel that said this:

just be sure that your cylinder matches your barrel length. I cannot tell you how many times I have seen people get a long ass 509mm barrel but have it matched with 4/5th or 3/4th ported cylinder, and their air system is extremely inefficient. That is key, whenever you purchase any barrel, is to make sure that your cylinder and barrel length match, otherwise your barrel upgrade is almost pointless.

Could you please help a tightbore noob out on this on? I'm very confused
Thanks.
-Brett

[Skladfin]

if you are getting a tightbore that is the same length as your original barrel, then you dont need to change anything

[incrediboy729]

So should I take out my inner barrel and measure it before i buy? thanks again for the quick response.

[incrediboy729]

Also the ad says the barrel is 363 mms long, so that means that i need to make sure that my barrel is 363mms long - hop up, correct?

[Skladfin]

yes

[incrediboy729]

I checked my instruction booklet before opening my gun up and it says that the "barrel length" is 363mm. The barrel I want is 363mm, so i assume that means i'm good to go and the "barrel length" described in the booklet is the inner barrel length?

[Skladfin]

YES YOU ARE GOOD TO GO

[incrediboy729]

Ok. Thanks again for being so patient with a noob.