98Z5V

Looks alot like a GunTec USA rail I've got on the 12.5" Grendel. The Air Lite, from them. https://www.guntecusa.com/ar-308/M-LOK-Handguards-308/15-length-1141588888/15-mod-lite-skeletonized-series-m-lok-free-floating-handguard-with-monolithic-top-rail-308-cal.html Here's all their 15" stuff: https://www.guntecusa.com/ar-308/M-LOK-Handguards-308/15-length-1141588888

For your buffer, do one of the things I stated in the thread I linked in this thread. Have you weighed your buffer that you have? Do you know it's 3.8oz? I can tell you what makes a 3.8oz buffer that's 2.5" long, and I did in the thread I linked earlier. You can make a maximum of a 5.15oz buffer that's 2.5" long. You can make it yourself. If you want to make that minimum buffer operating weight that a .308 Win AR needs (5.4oz), then you need to look at aftermarket manufacturers. HeavyBuffers.com is the only one. kakindustry.com coms even closer to the 5.4oz minimum, with a 5.3oz, 2.5oz buffer. Your choices are very limited, and it loks like you committed to the Sprinco Orange spring, so you need to either make, or buy a buffer that's pretty close to 5.4oz. And 2.5" long. In that thread, I made a 5.7oz buffer with a combination of parts, and it came up 0.069" short of 2.500". One quarter down the receiver extension solved that problem...

You can try to shoot it with that 0.080"-ish gas port, but it's not gonna run, man.

^^^ ...And those are midlength gas barrels... Hit this info, check out survivalshop's info - his Fulton Criterion 16" rifle gas barrel is in here:

^^^ The DPMS LR-308 Carbine buffer isn't almost 3" long, no way. It wouldn't run in that 7" internal depth receiver extension - the BCG wouldn't come back far enough to lock back, at all. It's 2.500" long, within a few weird thou... 2.938" on it is unpossible.

The Nikon Black is pretty damn good - I've got the original Black X1000 6~24, in SFP. You range it in 18x mag. It lives on the 300 Win Mag bolt gun. It's a good scope, even though Matt hates it...

I love 3:37 in this song....

Holy shiit... That's CHEAP!

Excellent remake... Superb.

This is gonna cost me, as I need a few things. They're local now, too, which might turn into being a bad thing...

Don't run an AR15 spring in a 308, brother. It's not strong enough to handle that weight and force. You'll have some recoil at your shoulder that isn't good for your shoulder, and not good for the rifle.

16" rifle gas .308 barrel will have to have a gas port diameter of 0.100"~0.105", or it's not gonna run. Check your gas port diameter on that barrel. Criterion understands this, as they were one of the first ones to make this config, for Fulton Armory. Check it anyway.

.458 Win Mag is out. Not gonna happen, with a Long Action cartridge in a Short Action upper and lower receiver.

I just recently picked up one of these for the .260 Rem, and I'm very impressed with it. Very. Athlon Argos BTR 6-24x50, FFP, MIL, Illuminated. https://athlonoptics.com/product/rifle-scope-argos-6-24x50/

Don't skip this thread, David... It's worth reading through, in your circumstance...

Coil count is important, as well as wire diameter - together, that's what determines your spring tension, over a given length. If you have a spring that's 12" long, and it has 5 coils, it's gonna be a bitch to compress. If you have a spring that's the same length, and 30 coils - it'll be easier to compress, but not as stiff as that first example. Coil count matters. If you have a wire diameter in that 12" spring that's 0.010", that's tiny, like ink pen springs. You have a wire diameter of 0.072", and that's a proper recoil spring size. Smaller makes it weaker, larger makes it stronger. This stuff really does matter - and there are SO MANY companies that don't even have a clue. That's why I switched everything out to the Armalite parts. One source, one manufacturer, and it's from a company that really understood what they were doing when it was all developed in the first place.

Refresh the page, man...

These two right here: https://www.hornady.com/bullets/rifle/30-cal-308-150-gr-gmx#!/ https://www.hornady.com/bullets/rifle/30-cal-308-150-gr-sst#!/ And the Barnes 150 TSX. It's a little more, and figuring out loads for TSX rounds takes a little more time, since they're all copper, and a little longer than comparable-weighted projectiles. Those Hornady SSTs will get it done.

That's a damn good lookin' rifle, right there.

Here's the reason I say this, specifically. The Wollf XP spring and the Sprinco Orange spring are manufactured to a specific standard, for a purpose, by companies that make springs. They both know what they're doing, and they did it on purpose, for a purpose. All other companies are guessing. Sometimes they get it right, most times they fuk it up tragically. But, hey, even a blind monkey finds a banana once in awhile, right? It is not worth your time and money to keep experimenting with springs, hoping that they got it right - and maybe getting lucky. Your 9" spring is a perfect example. That's not enough spring for any AR platform, no matter what caliber - but it might work in a .22LR conversion, where the "BCG" never moves.

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.