WeR0206 said:

+1 on that. For those who haven’t been able to watch the video here’s a rundown:

Carriers with the following finishes are the most likely to be gas efficient: chrome, phosphate, NP3.

Next tier after that is DLC and Nitride

Next after that is the PVD type coatings (inside finish tends to be rough)

Least likely to be gas efficient & most likely to have various problems is nickel boron (also likely to have headspace issues if the bolt face is NB coated).

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That looks ass-backwards to me...............

Coefficient of Friction (COF) is a major reason for coating BC's & in descending order of COF is DLC, PVD, NP3 (a form of NiB) Chrome, & lastly, manganese phosphate.

So all else being equal (bore for gas rings, outside contact dimensions of the carrier, fit / seal of the gas rings), the friction, or lack thereof, of the carrier plays a significant role in "gas efficiency"................whatever that term is intended to define.

This can also be determined somewhat subjectively, by "feeling" the difference in "smoothness" of various BC's when cycling the BCG by hand. The absolute smoothness of feel for me has been a JP lightweight BCG, but that may be in a great part the design, followed by DLC...............other stuff, including chrome (although I like it a lot), just doesn't cycle as smoothly.

Additionally, I really have to look at OCKS screws with a jaundiced eye as far as being any kind of efficiency improvement or even reliability component................a correctly sealed (with Permatex), unstaked gas key has been completely reliable for me whenever I've used that method, as defined & described by Young Manufacturing (Dan Young DOES know a thing or 2 about AR's) has been 100% reliable. Dan Young on Staking Gas Keys

In fact, he clearly stated (at the time) that they would not warrant staked gas keys / carriers, installed that way by the builder.

Also, where is the info coming from as to what sellers are using what actual part manufacturers, such as Microbest or Toolcraft (who only makes carrieres)? The only seller that I have ever seen to acknowledge who is making a given part is Noveske, who has actually stated the RCA was the maker of their nitrided BCG's.........don't know if that is still the case anymore though. But I have never seen any public acknowledgement from anyone else.

MM

More Arizona drivers:

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It’s also a great way to get scammed.
Be very careful. You are about to meet your Nigerian Prince!

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This is a WTB post and is not allowed in the General Forums! It can only be posted in the PX and that requires a paid membership.

Top O' Texas said:

any specific 140

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Sorry didn’t catch this. 140 elite hunter

Malum Prohibitum said:

They have edited them?

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Look up the despecialized edition. It's closest you can find to the original. Special editions started in 1997. Check out this Wikipedia for some of the changes.

Other versions that look good from a quick search are 4k77 and 4k83.

koshkin said:

I've been using Area 419 lately with very good results, but there are plenty of good options out there.

ILya

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My latest scope went into A419 rings and I really like them. My other ZCOs are in the ZCO Block Mounts they are also really great.

Usmcgeek said:

Any recomendations?

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I've been using Area 419 lately with very good results, but there are plenty of good options out there.

ILya

taseal said:

Have you guys tried mounting it on a rifle? Like a Burris PEPR that has rails on top of rings. Put it on the rear rail front for wmlrf

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I would not recommend doing this.

Reminds me of the asshole who gave an interview ripping Musk for lying about these numbers . Interview was a couple months ago and I think the guy was Social Security Admin Director .

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As far as availability goes:

The dealer structure has changed substantially. We are now dealing with outside rep groups instead of buying from Aero through their internal sales reps. I still cannot order receivers with a solid projected ship date or have anything "in stock".

ttt

BurtG said:

View attachment 8695666

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Stop noticing the 12% committing over 50% of murders. [Same 2019 FBI dataset]

How do you measure the relative importance of any variable in a system?

Colorblindness is racism. Don’t deny these people the dignity their heritage.

SNB said:

Are you trolling me?
For 1 k, longer and thicker barrels are used.

The dispersion in subsonic speed of this caliber is such that even with SD 9 (which in itself would be an achievement and very expensive in terms of equipment if it stays that way ) you will stop hitting the gong at about 450m (492yd), and most likely even closer.
300м(328yd) is already the limit range of predicted subsonic shooting in different conditions using relatively inexpensive equipment at something less than half a gong. At least for me . For predicted subsonic shooting for the next additional 100 yards, the equipment needs to be + 2k
For this you need things like an AMP press and weight accuracy , 02 grains. and also a custom die for your chamber.

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SNB said:

Are you trolling me?
For 1 k, longer and thicker barrels are used.

The dispersion in subsonic speed of this caliber is such that even with SD 9 (which in itself would be an achievement and very expensive in terms of equipment if it stays that way ) you will stop hitting the gong at about 450m (492yd), and most likely even closer.
300м(328yd) is already the limit range of predicted subsonic shooting in different conditions using relatively inexpensive equipment at something less than half a gong. At least for me . For predicted subsonic shooting for the next additional 100 yards, the equipment needs to be + 2k
For this you need things like an AMP press and weight accuracy , 02 grains. and also a custom die for your chamber.

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No im not Trolling you. I’ve done it to 1000 yards. I started at 800 yards using 208 eld.

DocUSMCRetired said:

With the latest update to AB Quantum. That Depends. You can now switch between pointed North and pointed Target in the settings. This only works with the Calypso AB Mini paired to AB Quantum, Garmins, and Kestrels.

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Have you guys tried mounting it on a rifle? Like a Burris PEPR that has rails on top of rings. Put it on the rear rail front for wmlrf