98Z5V

Welcome. What state are you in?

You definitely don't get it enough. FML, I get accused of being an Armalite Fan Boy, and I don't even own one. You need more grief piled upon you, in a fastidious manner...

Whaddaya mean? He and I got along great. We had some disagreements over engraving, but that was small stuff...

Hmmm... 0.089" gas port diameter, per specs, but as stated, did you measure that, and come up with that, to verify? At any rate, that doesn't matter, because... How many times here on this board have I stated that the proper gas port diameter for an 18" rifle-gas .308 AR, .308 Win cartridge, with a 0.750"gas block journal needs to be... 0.093"~0.096"... Your gas port is too small. In fact, you may need an even larger gas port diameter to properly run subsonic .308 Win ammunition, even with a suppressor - in a gas gun... Something between 0.093"~0.096" is the bare minimum, though - so, even if it's what they say it is - it's too small...

Your gas tube is perfect - don't mess with it. Leave it alone. The "as carbines tend to be overgassed" statement means you're way off track here. You're running a carbine recoil system, which doesn't have anything to do with the gas system. Again, that barrel will have a 0.095" gas port, or close enough within a couple thou. Gas tube is perfect. Buffer is WAY too light for the mass of a .308AR BCG, and the power of a .308 Win cartridge. WAY too light. It need to be 5.4oz, or as close as you can get to that, and it needs to run a good recoil spring. So... You can fix this one of two ways. You can KEEP your receiver extension - if it's truly 7.000" internal depth, and not 7.100" internal depth (measure closely, and carefully). If you KEEP that receiver extension, then you need a buffer that's 2.500" long, and damn close to 5.4oz. KAK makes that beast, and it's 5.3oz - good enough. It's certainly not 3.8oz. https://www.kakindustry.com/lr308-carbine-buffer-heavy Next, you need a spring that's been designed to run a real 2.500" long buffer, made for the weight of a .308AR BCG, and the power of the .308 Win cartridge - you need the Sprinco Orange Spring. It's in stock here, right now. That doesn't mean that it will be in stock in 15 minutes, though. Not in these times. https://www.primaryarms.com/sprinco-ar10-orange-extra-power-carbine-buffer-spring Your problem isn't overgassing - you're under-recoiled. The the weight of this BCG, and the power of the .308 Win round, your BCG is moving too fast, and missing the next round in the mag. It's also extracting too early - because there's shiit for buffer weight and spring pressure holding it in place, to allow the case to cool - and reliably extract. There's not enough MASS to control that ASS... Looks like overgassing, sure. The bandaid is an adjustable gas block. But, that's putting the bandaid on the wrong cut... You need a reliable recoil system, and not something that's cheap for a manufacturer to pump out. Second way to fix this, for real, for permanent, forever (the above method will do that, too) - just buy the complete Armalite AR-10 Carbine Recoil System, and be done. The Armalite part # is AR10REKIT01. https://www.armalite.com/SACItem.aspx?Item=AR10REKIT01&ReturnURL=/Armalite/Product-Category/AR10-Parts-Accessories/Lower-Receiver-Parts&Category=ac614400-ff09-4cdf-9d35-419a654e7201 Both methods work very well. Reading this thread would have saved you a bunch of time, and you would have figured it out on your own:

AAAAaaaaaaaahhhhh.... it all comes back to me now, and I connect the dots... JF89 would have a field day with this stuff...

Whoa! Backstory on this? You lose a license, brother?...

A serious piece of history here, brother. Here's the Cliffs Notes: https://www.guns.com/news/2012/05/29/project-titan-308-experimental-compensator-barrel-shroud https://www.thefirearmblog.com/blog/2012/05/25/project-titan-interesting-308-ar-rifle/

Well, then... I MUST do it. An Ode to the past.

Your gas port diameter is too small to cycle subsonic .308 Win loads, with suppressor. What's your gas port diameter in the barrel?...

Nope, lets get it straight - it's Salted Caramel Whisky... He better not drink the stash, before the Fall Shoot...

She's an anomoly. And she is badass. Nothing wrong with your head, in that thought process. She's always been hot, man... You ever see when she pierced her nipples?...

You did NOT just go there...

Whatever happened with this girl? She was supposed to go to Africa and hunt illegal poachers.

This is gonna be SWEET!!!

DAMN, brother!!! That sounds like one of my motocross wrecks... Get better, and follow what the Doc tell ya!

Well, THAT SUCKS!...

Yep, they're done now.

^^^ That last pic is Christmas Abbott... She's been a Dream Girl of mine for a long time now...

Very important questions here - not like the others weren't important, too - get to those first... then... What AMMO are you shooting, that's causing this malfunction?... How many rounds are through this gun so far?... How well did you lube it?...

Gas port was too small. Not uncommon these days, with barrel manufacturers on every street corner. There's a vast many of them that don't know what they're doing, and shouldn't be in the gas-gun barrel business.

Absolutely. Accu-Washers are far superior to peel washers, and crush washers. It's all I use for muzzle devices now, and for the last several years.

Need aaaalllllloooooooootttt more information here. You've listed two parts of your system. The barrel and recoil system parts. Need to know the rest of the parts that make up this whole gun. Next, need your definition of "short stroking" - describe exactly what a fired cartridge does - what happens when you fire one round? Read this thread when you have time - it's important. Your Criterion barrel will have a 0.095" gas port diameter, if the gas block journal size is 0.750". That's a given, and that would be the correct gas port size for that barrel configuration. More than anything, we need to know what you're talking about, with the "short stroke," because that shouldn't be the case here, with your combination of parts. Where does your gas tube end, in the upper receiver? If you read that thread I linked above, you'll know exactly what I'm asking about.

They run a full-blown NICS check on you guys, just for a box of ammo?

FUk no, I can't build one, brother - If I could, I'd be a millionaire, and I'd have a hundred of them already. I know a guy that has an original - a REAL original, from WWII - and he makes them based on THAT spec. It ain't cheap, and one day, he's gonna have to make one for me. .303 Enfield action is almost all the same. #4, #3, it won't matter. The preferred to make one is from the #5, Jungle Carbine - but it doesn't matter which action it's made from.