98Z5V

Details, details. JP Carbine spring - for what? .308AR or a 5.56 gun? two different animals. Spring specs, like I asked before. Buffer... it's a "Brownells 3.8 buffer" - well, how long is it? It's either 2.500" or it's 3.250" long. "bcm carbine length tube" = what" What the internal depth? It's either 7.000" internal, or it's 7 5/8" internal - BCM doesn't mess that up. But, it's one or the other. Since you fired 75 rounds, the recoil system isn't trashed - it worked. Before. Something happened here, that made the gun not run anymore...

You fuckers ain't met TactiCat yet. He lives to fight dogs. He might not take out a combat dog or a police dog - but he doesn't back down. He charges. ^^^ Those two already had their asses kicked by him many times... They knew better...

That is from extracting and ejecting a live round from the chamber - they're dragging against the locking lugs, on the right side of the locking lugs - during extraction. That's to be expected. Pics would help. If you show the marks on your live-extracted ammo - those marks will be spaced apart the same distance as the locking lugs in the barrel extension. Pics, man. Put 'em up. We're trying to diagnose something, and we're blind here, literally...

THIS is why I only buy from Reputable Vendors. That's Rule #1, right there.

That 5.56 took a minute to figure out. Almost half a 20-rd mag. That bitch was DRIFTING, bigtime. I've never shot 5.56 in that kinda shiit, at the 850 - LEARNED ALOT ABOUT IT, with that, and it was very vaulable info... The .308 168gr did great, in that wind - for a 168. I had some wind hold on that fucker for those, but it performed. My 178-load would have smoked that. That .260 didn't give a shiit... That wind didn't fuk with it much. That .260 against any wind is kind like me, brother...

There were warnings from EOTech back in 2009, on CalGuns message board, about that fake Chinese shiit-copies... Those EOTech links from 2009 are all dead now, and you can only find the one I posted, now...

More like 5-ish, but yeah, with EOTech. Here's their web page on it, but it doesn't have a date: https://www.eotechinc.com/counterfeit-alert-how-to-spot-a-fake

Good find, brother - those Chinese bastards did this awhile ago with EOTech red dots - and EOTech had to put out a similar letter, with pics of fakes. That was about 5 years-ish ago now.

That scope is pretty badass for a Grendel, if you want to max out at 600. It's a BDC scope with ACSS reticle, with zero instructions to set it 0.75" high at 100, and the BDC lines up for Grendel. So far, that is true, to 500. I need to work out another target to 600 and test it (probably from camp-site towards the north, along the ridge - and get it right at 600). Just checked the new online-manual for it, and they're changed it a little - I might need to re-zero this. I'm 2475fps out of a 16" barrel on my handloads, and they want a 200-yard zero for 2500fps for this scope. I'll play with that alot more, now that the weather is cooler. ALOT more. Here's the reticle. I'd love to get that 800-yard hashmark ON... I have a plan, brother - It's on at 500 now, with the hash mark for 500 - it hits the IPSC steel. I'll just paint up an IPSC target all white, drop it at 500, with a 5x5" black line around that all white target center - I'll just zero the gun at 500 - then see what it's shooting at 100. That's my dope on it.

WIDE OPEN your gas block, man. Don't change it again until your gun runs right. Sort the other problems, first. You complicated shiit with complicated shiit, and it's complicating the issue with solving what's wrong with your gun... WIDE OPEN that gas block, and leave it like that until everything else is sorted out. You WANT max gas flow right now. All of it that's available.

Need more gun details. Don't suspect the 2A upper and lower right away, at all. Don't suspect the Faxon barrel right away, at all. List all your other parts, in specific, every single part you used for the recoil system. All of it. Receiver extension brand, type, internal depth down the tube - buffer length and weight. Spring relaxed length, coil count, brand and type. You run an adjustable gas block wide open when you get it, and you only adjust down. Wide Open. All the way. Otherwise, you'll never know if your gas port in the barrel is even large enough for what you need. Get rid of the MagTech ammo, and any other cheap ammo that you have. Stick it in a box, and hold it on the side - until you get this gun broken in on quality factory ammo, and running right. I don't know what you've built, because there's a very limited parts list in your first post, but it doesn't sound like a cheap gun. Don't buy a new Corvette and fill it up with 87 octane. Find some Federal Gold Medal Match in the 175gr flavor, and run your gun for about 60 more rounds with that. Or, just get some other quality ammo, like PMC Bronze. Just run something good - MagTech sucks. Been there with it. #1 - complete parts list, very, very detailed on the recoil system. #2 - get a picture up of this rifle. #3 - get a picture up of how far the gas tube protrudes into the upper receiver - preferable pics are with the BCG OUT, and looking straight down into the upper receiver. Need to see the end of the gas tube... You ran 75 rounds through this gun, then something happened... It worked for 75 rounds - then it didn't work. Something broken in the trigger group? Break a hammer pin? Disconnector come apart? Pop a primer in some of that MagTech ammo, and it's jamming your trigger group up? Man, there's so many things that could be wrong here - but you haven't given enough information yet...

At least, they didn't say "Shenanigans" again...

Reminds me of something Kenny Moore once said... "No, really, don't mess with me because I don't come down to the bus station and slap the dick out of your mouth when you're working, do I?....."

That's that Bruce Jenner shiit, ain't it. He's eating the same thing as Bruce?...

Brother - that thing got built. And it's BAD... 16" carbine-gas 6.5 Grendel M4. MaTech rear sight, my own set-screw front sight base, and a Primary Arms 5x fixed prism red-dot scope. It's no joke at 500~600 yards. I haven't tried it on the 850 yet. I guess I need to get that dirty girl out more. That went down when your Grendel Mk12 build went down. Same build times.

My dope chart on those 88s was dead on the money at FS19. RIGHT on the money. It was 8.1 mils of drop at 850, just like the chart said it should be. Last weekend, I had to pull 10.0 mils of drop to hit the 850 with the 75gr Fed American Eagle ammo. That's a huge difference, right there. Almost 2 more mils of drop. All loaded ammo, between the two loads - factory ammo. It was this vs. this.

NICE, BROTHER!!! You found it all!!!

Are you kidding me?... I guess the other one was carbine-cutout, wasn't it...

I'm SENDING YOU SOME. What the hell you adding that to a cart for?!...

That's BS. I'll find out what's going on...

That is FANTASTIC!!! Congrats to you two!!! I'd be a few years away from 30 right now, if I stayed with that first one. NO WAY was that happening, though...

That Sierra MatchKing 90gr is supposed to be a bad bastard in 224 Valk, brother - don't get sucked in though - Sierra now makes a 95gr SMK, just for Valk, but the thing needs to be shot through a 1:6.5" twist barrel to run right. 1:7" just won't do it for that one. I'm WAY happy with how the Hornady 88gr Match ammo ran at the Fall Shoot - and I don't have a single thing yet for reloading this cartridge. I'll get to it, eventually, but it won't be sooner, it'll be awhile. I need to duplicate that load, it did great. I wonder if Barnes has a TSX or TTSX for this thing... EDIT - SHIIT... They DO have a TSX, 78gr. That's as big as they go in the TSX, but the thing has a BC of .383, and it's 1.145" long... Nothing close in TTSX yet... EDIT 2 - @MikedaddyH - that Federal American Eagle 75gr Valk isn't bad - I just tried it on a shiity day, with high wind, at 850 yards. It did fine at 500 yards. It's good, under that, too. Plus, it looks like good brass, so that's a bonus. When I get to making this stuff, I'll be using CCI 41 primers for all of it - I learned my lesson on the Grendels, and this is similar. That much power in a little small-frame AR cartridge, it's gonna wear out primer pockets. Just go with the 41s right off the bat, man. I'm moving the .260 Rem over to CCI 34 primers.

Let me check into that... I'll get info back here on that.

That whole thing was EPIC!!! But, watch your ass, Doc... @Armed Eye Doc