A Leopard can change it's spots

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Mak
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Over the years, I've been at best lukewarm on the subject of the AR platform. Mostly, this arose from an outdoorsmans' perspective, where different, as in more powerful cartridges, and more traditional configurations of wood and blue steel held sway.
Those thoughts, however, belong to a better time. 
It is no longer possible to rest in the certainty that one will have an outdoors available to them, or access to even these traditional arms in the future. The agenda of certain groups and special interests, long simply an annoying harangue in the distance, has now found its political footing. For the first time, there is an open agenda that exists in defiance of freedom, in defiance of the founding concept of this country, in defiance of it's traditions, which threatens the very existence of what makes America the great experiment in liberty that it is.
So, in response to the frontal assault on America, launched with popular approval only from small and very vocal circles, I hereby rescind my reticence towards America's rifles, the AR15 / AR10.
It is now vitally important for Americans to recognize the nature of the times we are living in. A light, fast handling AR 15, or a stable, accurate AR10 can and will make a statement regarding the side you stand with. Either will also provide capabilities to secure one's person and family in the days ahead. One can hope that rationality and common sense will prevail, yet it is unlikely that those who prosecute this war on freedom will ever reach this rarified place.
I don't think it's too melodramatic to state that if freedom is defeated here, it's defeated everywhere. It's far better to preserve something precious than to have to reconstruct it from remnants, and the symbol of the black rifle is a powerful reminder that freedom has it's champions.

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BAR-AM10

img_3065.8X72

SIXGUNNER
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I SEE LITTLE HOPE. MY GRANDSON WHO IS 27 SAID TO ME:

"PAPA I SURE ADMIRE YOUR GENERATION BECAUSE MINE IS ALL SCREWED UP."  PROGESSIVE/SOCIALIST/COMMUNISTS/DEMOCRATS, CALL THEM WHAT YOU WILL, BASICALLY CONTROL THE MEDIA,ENTERTAINMENT (SO-CALLED), EDUCATION AND GOVERNMENT, EVEN SOME CHURCHES.  KRUSCHEV WAS RIGHT WHEN HE SAID WE WILL WAIT UNTIL YOU ARE READY TO BE PLUCKED LIKE RIPE FRUIT.

SIXGUNNER

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Next...

...you'll be shopping for a range finder and a kestrel!

Mak
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Possibilities

In approaching this problem, I've always tried to understand the opposition's point of view. Mind, not necessarily to agree, just to discover if their position had merit, if it had a logic, and a sense of coherence.
Unfortunately, all I can find in the current proposals is the odd belief that demonizing a segment of the population, and attacking them with ever greater restrictions, will somehow make society improve. I find this concept both childish and amazingly stupid.
In the end, movements like this current one promise the Moon, and deliver only greater chaos. It's the chaos part I see looming on the horizon.
Al, I love the pics. Maybe at some point I will have something worthwhile to photograph, but until then, let's celebrate whatever freedom we can still enjoy.

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Couple recent AR-40 builds

40 S&W Pistol and Carbine
More fun at the rockpit.  
2019-04-12 18.15.49

Mak
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PCC's

I've heard some mention that the bolt in a semi auto pistol carbine has to be heavy in order for the blowback design to have enough inertia to properly, not prematurely, cycle the action. This means that a large percentage of the recoil pulse is the byproduct of the design.
I've heard of some folks tearing their hair out trying to discover the correct buffer and spring to handle the blowback recoil, and maintain reliability.
How do these builds work in this regard? It appears that you are using AR 9 lower receivers, that take standard pistol magazines, probably Glock.
I know I'll be dating myself here, but I've always thought a great round for these style guns to be the 460 Rowland. I mean, if one must deal with the thump of a heavy bolt, then it should be paired with heavy thumps at the business end.
It's been a number of years now since I've heard anything about the Ol' Rowland, but I remember how it used to bend moon clips into pretzels. Fun!
Nice builds.

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Blowback

Mac, you are 100% correct! First day out to the range one better show up with a bunch of different springs and buffers if it's their first build.
Pistol I run a 7.5 0z buffer and an AR-308 carbine spring, (over twice the weight of a AR-15 buffer and an oz+ heavier then the one I run in my AR-308!) Add the weighted bolt carrier group (14.5oz) for a total of 1 lb 6 oz recoil mass, and believe it or not, the buffer still shows signs of bottoming out in the recoil tube. (Have a couple of AR-10 rifle springs in the mail).   Shooting my IPSC 180 gr major loads (Tightgroup powder little under 1000 fps) it cycles flawlessly, no case bulge, brass flies 30 ft at 4:00.   Carbine I'm going to start with a 10oz buffer, and some full blow loads with a little slower powder (VV-3N37)  See how that works out, book says 1100 fps +/- not counting the longer barrel.
Amazing thing about these blowback systems is how little the case needs to move rearward in order to  generate enough momentum to extract and cycle. By my calcs, with the 7.5 oz buffer,  14.5oz BCG, 4" barrel the case only moves 0.0003" +/- during the dwell time (bullet in the barrel). In the 16" barrel / 10 oz buffer it should work out to maybe a little under .001" during dwell. (Unless my math is wrong, a distinct possibility!)

Mak
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Carbine Velocity

A levergun can be far more forgiving in the pistol caliber versions than the AR. There are always exceptions, but the purely mechanical action, paired with rimmed cases has proven itself to work quite well.
The pistol carbine is, at least in my opinion, a modern version of this classic combination. Let's face it, a sixgun or a pistol will only have the support of one, or two hands, the carbine adds the shoulder and the cheek, which if done right, is always more stable.
A few years ago, some inquiring minds took it upon themselves to study .45 ACP velocities in different barrel lengths, and they found the optimal length to be between 10" to 12", in terms of peak velocities. Longer barrels had the advantage of moving muzzle blast further from the operator, but actually reduced velocity over the optimal length. My guess is that whilst other popular rounds have different velocity profiles, all would have their optimal barrel lengths.
Generally, the higher the velocity, the longer the optimal barrel length.
Yeah I know, we are stuck with various laws which prevent us from making best use of this information, and are unconstitutional efforts to disarm and neuter the populace, championed by those who really cannot call themselves Americans and have no business signing any law, yet there are configurations that might take some advantage of this information.
I've often wondered if a 460 Rowland would simply overpower any available spring and buffer combination. On paper, as you mention, Al, we are talking thousands of an inch. There are some clever machinists working on tunable bolt carriers, but as far as I know, these are limited to standard AR gas systems.
In any case, both your builds celebrate a new and interesting take on America's rifle, thanks for sharing.

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PCC

Haven't abandoned my Winchester PCCs, 94 Trappers in 357, 44, 45...
Shoot them regularly. Get the curious look or two when I have a couple of them and a couple AR's on the same bench!

Mak
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Understandable

It's understandable that folks would find the mix of leverguns, msr's, pistols and revolvers a bit of a brow raiser. Yet if the current crop of anti-freedom "justice" crusaders has managed to accomplish anything, it is the acceptance of kinship amongst all walks of the firearms community. If we don't stand together, we will hang together.
Personally, I love revolvers, probably always will. This doesn't stop me from appreciating the merits of a Glock. Similarly, I don't believe polymer and nitride can approach the warmth and beauty of deep blueing and fine wood, yet that nitride and polymer certainly has it's place.
Besides, it can be a good thing to challenge assumptions and presumptions. I mean, how else are we going to deepen and expand our knowledge?

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Just to confuse the issue...

45-70 in an AR 15 frame-- 458 SOCOM
Finished up a build last week, launches 400gr pills at a fairly respectible velocity and uses standard GI mags.
It's a thumper for sure!

2019-01-06 09.49.00

2019-01-06 09.49.00

2019-01-06 09.49.00
458S, 45-70, and a 405 WCF

Mak
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Recoil pad

Eyeballing that carbine stock, designed for 5.56mm recoil, has me pretty convinced that some smart designer needs to develop an adjustable stock with a good recoil pad.