What Exactly Is Meant by the Term 'Barrel Window'

[alxndrhll]

Hi folks,

So I know what part of an inner barrel the window is, and I know it's purpose... but I've never really thought about what it means when folks refer to specific sizes of a barrel window. I've mocked up a super quick picture to try and make obtaining the answer a bit easier without the need to try and describe what is being discussed.

View attachment 62995

When talking about a window do we mean the section outlined in red, or the section outlined in green?
When measuring a window, where are we measuring. The part marked in blue, or the part marked in yellow?

Cheers,
Alex

 

[Adolf Hamster]

can't say i'm aware of any specific convention.

personally i'd regard the red area as that dictates the size of the contact patch that can be utilised.

of course the red and green areas are generally linked (ie an increase in red will also increase green)

 

[Guest]

Not a clue lol

 

[Lozart]

Hi folks,

So I know what part of an inner barrel the window is, and I know it's purpose... but I've never really thought about what it means when folks refer to specific sizes of a barrel window. I've mocked up a super quick picture to try and make obtaining the answer a bit easier without the need to try and describe what is being discussed.

View attachment 62995

When talking about a window do we mean the section outlined in red, or the section outlined in green?
When measuring a window, where are we measuring. The part marked in blue, or the part marked in yellow?

Cheers,
Alex

It's usually down to the measurement in blue. It's usually down to things like whether or not your trying to run R-Hop or ER-Hop etc. Somehave the front and rear edges of the window bevelled outward just to confuse matters even more!

Example of an extended cut:

It's usually done to be able to hop much heavier ammo in sniper/DMR roles. In a standard AEG it's arguably a waste of time.

 

[alxndrhll]

Much appreciated, my assumption was that there isn’t really a convention to it as it seems to be such a loosely used term and searches had come up fruitless.

To give context, I currently have an EdGI dual bore barrel in my SRS and have ordered the new Stalker Kraken hop unit (I’ll try anything and everything to be rid of the Silverback FAST hop). I’ve kept up with pretty much everything Wes has been saying in regard to compatibility, from that I knew I’d need to modify the Stalker bucking to fit my current barrel. But now I’m questioning if the size of the window on my barrel is large enough, Wes has stated you ideally want a window of 5mm... but I have zero idea where I should be measuring that 5mm from. The next common sense step is to ask the man himself I suspect!

TLDR I was trying to figure out which of these parts is potentially becoming an expensive paperweight, but it appears much like many things in airsoft it is entirely undefined.

Edit: Having spoken to Wes the 5mm measurement he was refering to was the blue one, so they should work together fine... which is a relief.