98Z5V

I've had TERRIBLE results turning PPU 5.56 brass into 30BLK brass. Two loads on it after conversion (once fired 5.56), and it's done. The bases bulge. I just went through a huge pile of all my .223 Rem and generic 5.56 brass - 1,116 pieces that lived, and got primed. This was all once fired. There were probably 30-ish cases that I threw out, after running them through the sizer.deprimer - bases bulged. All PPU. I have alot of the 5.56 PPU Match brass on hand, and never have a problem with it, when loading it for 5.56 loads. I don't even try to convert it to 300BLK anymore, though. It's just the regular PPU brass that I've seen my own issues with.

Indeed!

You'll need to drill the gas port up, for sure. Everything it takes to fix these guns is right here in the PSA Section. List all the specs on your gun, when you get the time. Follow this as a template:

This is gonna be a baaaaaad bitch, though. You want a rifle gas tube, brother? I can send one out.

I'm not seeing a PRI GasBuster in the pic anywhere. Hell,I don't see any charging handle in there...

Warmer weather raises the Density Altitude by a huge margin. That might have alot to do with this. Density Altitude goes up, speeds go up, pressures go up - and the projectile flies alot further, faster. Everything goes up, when Density Altitude goes up. Higher Density Altitude is bad for single-engine airplanes, but it can be good for guns and external ballistics. In this case, though, not so much, if it's the reason you're ripping up brass. You might need to change that load for the warmer weather. Example - my .308 Win load is Hornady 178 ELD-X projectile in Lake City brass, CCI 200 primer and Accurate 2495 powder. In 40~50 degree weather, it's exactly 8.5 mils of dial for 850 yards. in 105 degree temps, it's 7.0 mils of dial for 850 yards. It's a significant increase in velocity, and pressure. The proof is in what I have to dial to hit. The reason is the massive change in Density Altitude.

What are the full details on the recoil system now? Buffer length, buffer weight, we know the spring now, what's the receiver extension now? Still the VLTOR A5? Which one, there are two that work with stocks, and one specifically for pistol braces (we know it's not the pistol-brace one). What's your gas port diameter in that barrel? Shooting suppressed is always going to make more backpressure. Shooting unsupressed and getting perfect function should be the goal, to get the gun dialed in - then put the can on and adjust the block down until it fully functions. Trying to dial the gun in with the suppressor on is just adding more backpressure, and another issue with getting it all correct. Dial in the gun, then add the can and find out where you need to be. I agree with @edgecrusher - need more info on that brass that you're using...

It's gonna be a sweet system, and just RUN. I've spent about 8 or 9 years trying to get a dedicated 9mm AR running, and I finally think I have it figured out. PITA platform. Aero is simplifying it.

I love it...

No. It's not gonna work. Cancel one or the other. Buy upper and lower receivers from the same company to avoid major headaches down the road. Best bet altogether is to avoid PSA PA-10s, and that's no joke. Too much "proprietary" going on there. Stick with something that at least adheres to either the "real" DPMS LR-308 pattern, or the Armalite AR-10 pattern. Aero Precision sticks to the DPMS LR-308 pattern, perfectly, in the DPMS-High Rail pattern. Nobody can beat them, for what they do for this Large-Frame AR platform.n it' Nothing about this platform, in it's 3 major configurations, is like building or running AR-15s. Too many differences amongst the patterns. You're finding that out now.

By the way - this is not an "AR-10" - the Armalite AR-10 platform is vastly different, and won't work with much of the parts you're describing. This is information for you, just so you know. This is a ".308AR" that you're working on, but it's not an AR-10. You'd see that right away, if you tried to pin a real AR-10 upper to your PSA PA-10 lower. These platform differences are why this board exists in the first place. We've been around for a minute, and might know what we're talking about.

That's just for rail-height - the only reason they give that information. To select a rail. That doesn't mean it'll pin to your lower. Here's my story with PSA PA-10s. I can pin an Aero M5 upper to a DPMS LR-308 lower, and vice versa. I worked on a PSA PA-10 upper for someone - complete upper - and it would NOT pin to my Aero M5 lower, to test fire. So I tried it on my DPMS LR-308 lower. It would NOT pin to that one, either. I had to take the whole PSA upper apart, and transplant all it's guts into an Aero M5 upper, just to test fire it, and make sure it was good to go. That's my history with the two platforms. When PSA says they're "proprietary" - they're not kidding. But, we'll see how this works out. I'll await your test-fitting.

Those two major components of the gun system might have great difficulty working together. Let's see what happens. Welcome aboard.

It's finally alive, and shipping. Well, this is late - it was shipping on March 3rd, and it's sold out everywhere right now - all the parts, pieces, components. We'd expect that, with the environment that we're now in. If you can find one - it's badass. https://www.aeroprecisionusa.com/epc

Mark LaRue is... https://www.larue.com/page/larue-tactical-6-5-grendel-fde-rifle-k/ @Magwa doesn't do too bad for himself, either, hunting elk. It's well documented here in the hunting archives.

Why do you think I have so many calibers? I'll get lucky with something, when I pick it up...

You're talking external ballistics, on an internal ballistics situation. External ballistics don't matter, with what's going on inside the gun. Environmental is all that matters on external ballistics. That's what I do - I'm constrained to seating depth, based on magazine internal depth/length - that sets my max loading length, no matter where the rifling lands fall. On some, I measure mag length, determine that optimal powder/load node, and I shorten up the seating depth for better accuracy. It works. Check this book out: https://store.appliedballisticsllc.com/Applied_Ballistics_For_Long_Range_Shooting_3rd_p/0006.htm

Definitely tell him to fuk himself...

They're all gone - just like reloading supplies. It's fucking ridiculous out there.

^^^ Solid advice - always check the hyperlinks.

I need to get you hooked UP! I'm on my ass on that side of it, brother. I will take care of this. My PP-fuking has turned me upside down, for "normal operations..."

Pressure. Speeds and projectile weights (the combination) primarily. The faster something shoots, the faster it's gonna eat up a barrel. There are some crazy loads out there in different calibers that are burning up 4k feet per second. Think Varmint guns, and the like. Those light little projectiles, just screamin' downrange - those barrels don't last long, until they're shot out. So, you hit on that, too - that (above) would obviously be an aggressive powder charge/load. Indeed. Light pills, hauling ass. The same is true with heavy projectiles, when you get those moving fast - that'll wear out a barrel quick, too. This is what we go for in long distance... My .300 Win Mag barrel won't last a long life, that's for certain. I worked the hell out of that load, and I've got 225gr Hornady ELD-Ms with a G1 drag of .777 moving at 2932fps. That load HAULS THE DAMN MAIL... That load gets me to the mile target. I know it'll go longer than that, too, I just need to set something up and do it. But I'll pay for it, with shorter barrel life. That's a load that's over the max suggested stuff, but all that max suggested stuff in published books is for liability - no company that produces a Load Manual wants to be responsible for some dummy blowing themselves up- so they list it conservatively. I've found that all my best precision loads are within 10% OVER the max listings in manuals. It just happens that way. I go to hit an accuracy node, until I see pressure signs before the next node. Keep track of the notes, write everything down when testing, see pressure signs, and move back down to that last accuracy node. Powder charge testing complete. After that, play with seating depth and fine tune it even more, if you're not restricted by mag length. Chrome lined steel barrels help barrel life, when things are hauling ass. That's why military M4s and M16s are steel, chrome lined. 5.56 .mil loads haul ass. 55gr M193 moves at 3250/3300fps. SS109/M855, 62gr green tip is moving close to 3100fps.

@1500VHO, glad it's running, man! The pattern for solid operation works, and works well. That combination that you have will eat any ammo that you throw at it, and that's the entire goal, the whole time. No need to thank me, though - buy me a beer sometime...

That is AWESOME NEWS, Cliff!!! Hell yeah!!!

That's some damn great news, right there, brother. That decision can be used as Stare Decisis going forward, when they try to make their own rules again - like they're attempting on pistol braces right now...