98Z5V

Holy shiit - never knew he was even military, let alone a Sergeant Major. Mind blowing.

Man, I said that on 27 December, adjustable gas block, gas port is way too large. It's 2.5 weeks later, and you shot it, came back with more functional diagnosis issues... You applied 1/2 the band-aid to the cut, here. You did the recoil system stuff. The other half of the cut is still bleeding, and we're stuck here reading, trying to figure out why...

Get that adj gas block on there now. Don't shoot it again until you do. We're fixing this gun once and for all...

Here's what we're dealing with... above ^^^ ^^^ That's why it's still happening. Recoil system is fixed now, but that 0.082" gas port diameter need to be about a 0.060" gas port diameter - and we can't fix that with recoil system alone. Maybe - maybe - stepping up to a heavy buffer from Slash at around 8.50z buffer weight would help? Maybe? You gotta get that adjustable gas block on there, and dial that shiit down. DOWN. one click at a time. Like I said before in this thread - there's nothing we can do to shrink a gas port. We can always make them bigger, but there's no going back. THAT is what's happening right now. 100% guaranteed.

This one works - very well - this is what's installed? If so, don't change it. It's not the issue here with the gun running.

For the record - the only single load that I've ever tested down to the 0.1grain increment was my Mk262 clone load. 75gr Hornady HPBT, LC NATO brass, CCI 41 primer, 24.2 grains of RL-15. 2789.75 fps, averaged over 30 shots, through a Ballistic Advantage 18" Mk12 SPR stainless barrel, 1:8" twist, .223 Wylde chamber. That load delivers. I've never ever put that level of load development into any other reload that I make. Never had to. Never wanted anything that perfect - and all the others have worked out perfectly, as well. Just takes time...

Nah, you're good - that range is good. I run gas gun loads in two ways, for ladders. 0.3 grains apart for Large Frame cartridges, 0.2 grains apart for Small Frame cartridges. Just because of the amount of powder, and the differences you'll see downrange when testing. The only things I've ever developed 0.5 grains apart was .300 Win Mag and .338 Lapua Mag - we're talking 70 to 90 grains of powder in those two cartridges. Shotcuts were necessary, just to find out what sucked the most, fastest. So, anything in the AR15 frames get 0.2 grain ladders. Anything that fits and shoots from the Aero M5s and LR-308s and AR-10s - I load those 0.3 grains apart. Makes the results of your loads super-easy to see, on paper, at 100 yards. You'll see it coming into a node, and hitting a node, pretty clearly.

If you're gonna use it for scope-ring torque and the such, they're pretty damn cool. Only reason I don't own one is because of the way-too-expensive Snap_on inch-pound torque bit-driver that I already own. Had it not been for that, I'd buy these things. Pick it up, brother, try it out - tell us about it. Or, just buy it, send it to me, and I'll certainly try the things out... Full write-up inbound, upon receipt...

ARF isn't exactly a plethora of great .308AR info in the first place. Just sayin'...

Certainly - if it's too weak, and not up to the task of running "the ass and the mass" of a .308AR, it could have the BCG running too fast. AR15 springs can't handle these things - not enough power in the spring to deal with it. If the BCG is running too fast, the bolt catch can't catch it, it over-runs the next round in the mag, because the mag spring can't get the round up there fast enough... Excessive speed in the BCG can cause alot of functional problems. They're not always easy to figure out. For that very reason, we always specify the same recoil system specs - rule all that recoil system shiit out, and then we're just figuring out the gas system.

Okay, so we're at the 0.082" gas port diameter. 5.6oz buffer that 2.500" long inside a 7.000" receiver extension. Sprinco Orange spring. Recoil system should be good to go. Let's refresh everything here on Page 3. Adjustable gas block, or no" Where's it set at, during function testing right now? Should be wide open. What's the story on the bolt catch? What are you running for a bolt catch? 10B can make the BCG drag, in a DPMS-based build. What's in there now? Post a picture of where the gas tube ends in the upper receiver. There's never been confirmation of this, yet. Take out the BCG, take a pic down into the bottom of the upper, and show where the gas tube is sitting. You running adjustable gas block? Or a standard gas block, non-adjustable? We need to get this thing solved, and running. That info I'm requesting above it pretty important, in that step, towards making a running gun...

Well, this is a fun one, for sure. Like I said before, the only company I know of that ever made a functional 22-250 was Olympic Arms. We'll need to sort this out. Try those new mags. I'll go back through the tech notes in this thread, and find what I can find. I'll be back in a little bit.

Can't open the word doc - don't have MS Word on the computer. See if you can .pdf it.

One other thing I can add here - that recoil spring might be an issue. Just because it's an unknown in the equation. Definite correct springs from known manufacturers that will work correctly, will be the Armalie EA-1095 spring, and the Sprinco Red spring. Those are the known springs that work in your recoil system config that you have.

What Rex said... ^^^ Soak that BCG first, run the gun again for about 50 more rounds - unless it's just unbearable, and obviously wrong. Give that a shot. NICE!!! Yeah, it's a sickness just like firearms. I have just as much in tools, maybe more, than I have in firearms. It never stops. If someone makes a tool that makes my life and my job easier, it doesn't matter what the price tag is on it. Especially if it's coming off the tool truck, and I can just give the guy $25 or $50 a week for it. Special tools help proficiency, speed, and decrease headaches and thrown wrenches...

Where you at on the Varget? I used that initially with Hornady 150 FMJ-BTs, before I couldn't find it and switched to RL-15. Just checking numbers, seeing how it compares to my load.

This is the truth... ^^^ Use multiple references.

Damn, that is a sweet boomstick...

You never very specifically stated that the KAK barrel closed on the No-Go gauge... Unless I missed it. I didn't read that in your initial post.

There are very small differences in different companies, with Go/No-Go gauges. The only way to check on that might be "iffy" is to contact the barrel manufacturer, and ask them what specific gauges they use. And that can suck. One company only uses Clymer gauges. Once company only uses Forster gauges... The list can go on an on. Here's the real deal. Go needs to go, diesn't matter who it's from. That stops you from a short chamber, and in an AR, with that recoil spring pressure chambering a round from locked-back - it CAN chamber a round on a short-ish chamber - THAT spikes your chamber pressure. That's not good. Make sure the GO gauge does go. If the No-Go chambers... take your chances. Put a piece of scotch tape on the back of the gauge, and see if it'll chamber - that'll add 0.001" to the length of the gauge. In-service weapons have a third gauge - the "Field" gauge. That's for in-service weapons use only. It's longer than the others, and accounts for throat erosion. If you can chamber a Field gauge - that barrel needs to go. On In-service weapons, if you chamber a No-Go, you try the Field. No-Go just failed, but if the Field doesn't chamber, you keep shooting the gun... Don't get wrapped around the axle about what some barrel manufacturer tells you, unless you specifically ask them what gauges they use to test, and you have those exact gauges, by brand. Don't go buying different gauges, from all he manufacturers... Just check your Go gauge from whoever you bought it from - ask here if your No-Go does GO... and we'll figure it all out. This is exactly what SHOULD happen...

That's completely awesome! That deer lost it on that pile. I love it. Great find, Pete!

I'll take all 5 - and plaster them throughout my house as a reminder, and remembrance. I'm in for all 5, brother.

The book is worth reading, if people still have time to read, in this day and age. It's a hell of a firefight and battle. This is the book:

CPT Nate Self - on Robert's Ridge. I worked with him in Afghaniland the next year, same area. That guy was a goldmine of information, before we ever went in, Day 1. On the ground intel is invaluable. Kept us alive.

Looking forward to shooting this thing, man - can't lie. Let us know how it runs.