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There are THREE other carbine receiver extensions that are positively verified as 7 5/8" internal depth, and can be used in place of the Armalite AR-10 Carbine Receiver Extension, without issue. VLTOR RE-10/A5SR VLTOR RE-A5 MagPul Enhanced Receiver Extension - SR25/M110

Here's the real deal on receiver extensions. There are only 3 types. 1. Rifle receiver extensions. They're the same across all platforms (we're talking "common ARs" here, not custom Long Action or Lapua Magnum ARs). AR15 rifle buffers are 5.900" long. 308AR rifle buffers are 5.200" long. Both buffers weigh pretty close to 5.4oz. 2. AR15 Carbine Receiver Extension. It's either Commercial or Mil-Spec (doesn't matter here, in this discussion), and it has a 7.000" internal depth. It works with the AR15 Carbine buffers that are 3.250" long - in an AR15. When you adapt that into a 308AR, your 308AR BCG is longer than an AR15 BCG. To run that longer BCG back into that receiver extension, you have to use a shorter buffer - you still have to fit all the gear into that depth. 308AR buffers are 2.500" long. Weights vary, greatly. Sometimes by design,and sometimes because manufacturers have no idea what they're doing. 3. Armalite AR-10 Carbine Receiver Extension. This one was developed by Armalite for use on the AR-10, with a collapsible stock. It uses the AR15 Carbine buffer, in H3 weight, which is 5.4oz. Notice that weight? Same as a rifle buffer... In order to run this weapon, with a longer BCG, and the longer AR15 buffer, they had to make the receiver extension longer (deeper, internally). The internal depth is 7 5/8". There is ONE recoil spring for Armalite AR-10 systems, no matter if you're running a rifle recoil system or a carbine recoil system. It's the EA1095 spring. It works in both recoil systems. You can run it in ANY rifle recoil system on any 308AR, no matter what brand. You cannot run it in a 308AR using the shortened AR15 carbine recoil system (7.000" internal and short 2.500" buffers). You WILL hit coil-bind on that spring, in the short recoil system. If you MUST run the short AR15 carbine receiver extension, find a heavy buffer. You can buy buffers from HeavyBuffers.com. They're made for this. Clint @ HeavyBuffers recommends the Wolff XP spring in this setup. Sprinco also makes a specific spring for this setup - the Sprinco Orange spring. If you're running the short RE, you will need one of those two springs, and you will need a heavier buffer than what you probably received. I gave details in that thread I linked on how to make a heavier 2.5" buffer. Or you can buy from HeavyBuffers.com. I quite mixing and matching a long time ago. Shiit springs that nobody knew what they were doing when they made them, buffers that were too light, receiver extension that weren't made to spec (had one that was 7.100" internal depth,and it cause all kinds of operational problems with the weapon). I stopped all the nonsense, and switched over to genuine Armalite AR-10 Carbine Recoil Systems a long time ago, on all Large Frames with collapsible stocks. I don't have recoil system issues, ever. My $0.02 on the matter... http://heavybuffers.com/reference.html (click this pic below to make it bigger)

I'm glad you're super versed on the AR15, but you need to think about this. The Large Frame AR is still a short action, so you're basically stuck with a 308-based case in what you can do. 30-06 is out, as a Long Action cartridge. On a short action, and your quest for ".40 and up" just look at a 308-416. You'll have to wildcat this one. Custom chamber reamer, custom barrel, custom reloading dies - and a .416 in a .308 Win case is gonna leave you with 19-thou of shoulder. Eh, well, that's almost like a 300 Blackout, so it'll work - if all your custom-produced parts work. Other than a .416, you're not going anywhere here, with this idea. You step up to a .423, and you're just about straight-walling the tapered .308 Win case. .470 is out. What else are you gonna do, here, with it? You can run the Hornady .405 300-grain projectile. It's got the ballistic coefficient of a brick. So, lust all you want, but do your research. If you want to step up to a Long Action AR, that's gonna be a shiit-ton of money - very few people make them. Pick a company that makes a 30-06-based AR, and you'll have more options, but you'll still have to wildcat it. All. Jump up even again, in expenditure, and get an AR that was built for the .338 Lapua Magnum - then wildcat that thing into a ".40 and up" AR... If it'll run .338 Lapua Magnum, it still won't run a .416 Barrett or a .408 CheyTac... You could neck that .338 Lapua Magnum up, though... We have a member her that owns his own manufacturing company, and makes .338 Lapua Magnum ARs, with foreign-military contracts . I'm sure, for a price, he could find a way to sell you receivers - but the rest is all wildcatting, and on you, and at a great expense. How far are you willing to go, here?... If you really wanna kick everyone's ass, make some AR receivers and design the rifle that would accept the CheyTac round - and neck that .408 CheyTac down to a .375 CheyTac. That'll destroy everything, long range.

That will be a great project - for both of you! That's awesome.

DAMNIT!!!

Nope, I was wrong - HERE is your GunTec GT-10 buffer, at 3.8oz. That's H1 weight. You need H3 weight in a 308. https://www.guntecusa.com/ar-308?product_id=1675&sort=rating&order=DESC&limit=100

Here's that GunTec buffer - it comes in at 4.4oz. https://www.guntecusa.com/ar10-lr-308-car-buffer-and-spring-set You buy it with that spring?

That spring looks SHORT, man! What's the relaxed length on that thing? I wouldn't worry about gravity-dropping that BCG,and it going into battery. Everything is new, and it goes through some serious "meshing of parts" in the first couple hundred rounds. Buffer length matches the receiver extension internal depth - but that spring is way outta whack. Buffer weight for a .308AR in .308 Win should be 5.4oz, whether it's rifle buffer or carbine buffer - that's how much weight it takes to control these things, when all other parts are working as designed. I've combined buffer parts before, and made a shorty buffer (almost 2.500" long) that weighed in at 5.7oz. I'll try to find the info. You can make a shorty buffer with off the shelf parts that will weigh in at 5.1oz. By the time you spend the money to do it, then the time to do it, you're better off just getting the Armalite AR-10 Carbine recoil system in your gun. At that point, no more worries. Thank you for the information - it's helping greatly. Here's the info on short .308 buffers:

That's decent as far as dented case mouth - I've seen far, far worse, like "half-flattened" on some brass. Great work on that rifle, man!

@edgecrusher needs to see this thread...

You can ship to my FFL (My Gun Pusher) and he won't charge any transfers. He owes me. Or I fuk up the cam timing on his Yamaha... Ship to him, FFL to FFL. No charge. Just paper, 4473s... Fly with a backpack, toothbrush, deodorant, with all your lacy thongs and shiit you wear...

I know you're reading this right now. If you want any slack - cut the rope...

Brilliant, Brother!!! Hell yeah!!! Specific dates of that are October 18~21, plan a day on each side for logistics if possible. For some people (Rob), that's just not possible, though. We know who they are... You... planning your planetrip IN on the wrong day...

NOW we have something to work with here. Since you're running a carbine receiver extension, you might as well rule out all the weird shiit that you can get form SO many manufacturers, and just run the AR-10 Carbine Recoil System, complete. A real 7 5/8" internal depth receiver extension that will take a real AR15 H3 3.250" carbine buffer, and the Armalite EA1095 spring. The real receiver extensions you can get are the Armalite AR-10 Carbine receiver extension, the VLTOR RE-10/A5SR receiver extension, the VLTOR RE-A5, or the new MagPul Enhanced Receiver Extension – SR25/M110. Trust nothing else for being "right," because most of the time, it is not right. Pick up one of two buffers: The real Armalite AR-10 Carbine buffer, or any AR15 H3 Carbine buffer - they're the same, at 3.250" long and 5.4oz. Only use the Armalite EA1095 spring. That will solve any possible issues that you might encounter in a carbine recoil system of a .308AR rifle. Period. You won't have recoil system problems, and if you have further problems - it's not your recoil system. Next - gas tube length. Take a picture straight down into your upper receiver, of how far the gas tube extends into your upper receiver. Straight down. It needs to come to the center of the cam pin cutout. Next - just get some P-Mags. Eliminate the possibilty of the ASCs. MagPul makes them NY-legal, varying capacities, and they're out there. All the info you provided above would have helped, greatly, on your first post - and you would have had more responses. Generic input = generic output. EDIT - While we're on it- remove complicated shiit from the equation, and just wide-open that gas block, until you get a functional rifle. AFTER you have a functional rifle, then you can mess with that fancy adjustable gas block.

I want the lady... Damn...

You ever go to a concert, and it's a little disappointing? Just doesn't sound right live, and they don't have it together like they did in the studio... So, this is why Staind is so completely badass... They're even better live than in the studio. They fucking rock.

Save for the PA scope.

Most of the ".40 and up" chamberings are on the small-frame AR, not the large frame. What specific cartridge do you have in mind, that's a short-action?... This just came out, not long ago... http://www.recoilweb.com/phoenix-weaponry-produces-45-70-government-ar-132226.html

That was the link to the podcast, right there in my post. Can "regular people" now post vids on Full30?...

I put them up on YT "unlisted" and only post them here. Since they're unlisted, the liberal haters can't find them and flag them. They did get some of them, though... Rob was Andre The Giant about 6 years ago - in girth. He's slimmed down alot since then... Rob kicked ass in a podcast a few years ago, so he's the Official Mouthpiece now, in a good way. He's very loquacious. https://firearmsradio.tv/ar-15-podcast/132

I've had fantastic success with the Primary Arms 4~14 First Focal Plane scopes. For the heavy 5.56 guns and the .308s, this one in particular is absolutely great: https://www.primaryarms.com/primary-arms-4-14x44mm-riflescope-acss-hud-dmr-308-223-reticle-pa4-14xffp308

He's received the strong-hand pimp-slap. Next 3 years, someone else will run his company... https://www.foxbusiness.com/markets/teslas-elon-musk-sec-settle-fraud-charges

Need to know more about what's going on here. BCG isn't going into battery - BCG is not seating when you try to chamber a round? Usually, there are other things going on to cause a malfunction like than, than a magazine issue. With more details, it'll be alot easier to narrow it down. Need alot more details, though, before you start spreading magazine lips and sanding them.

https://www.guns.com/2018/09/24/glock-introduces-new-glock-45-compact-crossover-gen5-mos-designs/ The one the Gun Pusher has can't be sold until Oct 5th. That bastid is teasing me...

The Glock 45 model, in 9mm, is out - got one shoved in my hands the other day. It's the 19X in black. It doesn't have that lip on the front of the grip that the 19X does, so it'll accept all Gen 5 mags, plus all previous versions of mags. It has the Glock plastic sights standard, but you have an option for the same steel night sights that are on the 19X. It's got the 19X cutout on the back of the magwell, but it doesn't come with the lanyard loop. There are no cutouts on the sides or front of the magwell. There are cocking serrations on the front now, that they should have done on the 19X, but didn't for some reason, so that's a big plus. Otherwise, it's a black 19X. My Gun Pusher, after he shoved it in my hands, was kind enough to tell me that he's got one Blue Label coming in... Not many picture on the web yet, but here's two: