[Jaccen]

Hello,

I have seen a few vertical ASA's where the top was trimmed down (please see attached). What's the maximum recommended cut? Ie. cutting from the top, what's the maximum distance one should cut. Conversely, if it's easier to express, how much aluminium "meat" should be above the air holes on the side of a classic vertical asa? I will be running air through the lines (ie. they're not just there for a foregrip support).

Thanks.