DD 16” midlength gassing

[Clint]

There is a notable difference in function with a .002/.003 port size change.

It's what we consider one "step" in port size.

Two steps is big difference, and is completely obvious even to those not paying attention while shooting.

I agree to an extent. But, one could at that point argue there's not a discernible difference between .073 and .076, but we know that there's a big difference in felt recoil and gun operating characteristics going from .076 to .071 at the midlength gas port position, or at least that I've been able to notice.

[MistWolf]

Or, be confident that when you buy a top shelf rifle, the engineers know something, and just shoot it.

Colt uses H2 buffers in their M4A1

[ta0117]

I have one and it also gauged at 0.076"...

I might have to take off my gas block to check, but I don't have any pin gauges. If it's a 0.076" gas port, that seems like a recent change, but even so it's still something like an informal midlength "standard" for 16" barrel. That's what just about every high end manufacturer use, like Sionics, BCM, Criterion, SOLGW, etc. The only major manufacturers that went smaller were DD with 0.073" and Colt with 0.071".

[opngrnd]

I might have to take off my gas block to check, but I don't have any pin gauges. If it's a 0.076" gas port, that seems like a recent change, but even so it's still something like an informal midlength "standard" for 16" barrel. That's what just about every high end manufacturer use, like Sionics, BCM, Criterion, SOLGW, etc. The only major manufacturers that went smaller were DD with 0.073" and Colt with 0.071".

Several of the manufacturers you listed go smaller than .076" on a 16" bbl.

[ta0117]

Several of the manufacturers you listed go smaller than .076" on a 16" bbl.

Which ones? Has anyone compiled a list of 16” midlength port sizes by manufacturer?

[1168]

Colt uses H2 buffers in their M4A1

I’m well aware of that. I’m also aware that when the M4A1 had govt profile barrels, before we got upgraded to the newer heavier type, it came with H buffers. Would anybody care to guess which profile the DD V9 has?

Edit: the assholeness of this post was completely unintentional. I would make an awful diplomat.

[prepare]

I forgot to mention the type of muzzle device in the sum of parts.

[Leonidas24]

Which ones? Has anyone compiled a list of 16” midlength port sizes by manufacturer?

https://docs.google.com/spreadsheets...JXXrk/htmlview

Sent from my SM-G981V using Tapatalk

[MistWolf]

I’m well aware of that. I’m also aware that when the M4A1 had govt profile barrels, before we got upgraded to the newer heavier type, it came with H buffers. Would anybody care to guess which profile the DD V9 has?

Edit: the assholeness of this post was completely unintentional. I would make an awful diplomat.

We all have our days.

After testing different carbine buffers with 5.56 ammo in an 11.5 AR upper with an adjustable gas block, I found the H2 has softer recoil than the lighter buffers. I also found that the carbine, H and H2 buffers required the same gas setting for full lock back. As it has been commonly accepted that heavier buffer weights required larger gas ports, this came as a complete surprise.

[17K]

I think there’s a range of weight that the gas drive works with.

Too light, and there’s not enough mass to retain enough momentum for the everything to fully cycle.

Too heavy and you have the same problem.

H2 and A5-2 seem to be the almost universal sweet spot.