98Z5V

The shorter length doesn't deliver the gas pressure needed, for the correct length of time needed, in order to cycle the weapon the way is was designed. That's Gas Timing. It disengages early, gas pressure isn't delivered for the amount of time that it's designed to do, and you don't have the force driving the recoil system - that you should have. In that case, it's better to run the Armalite AR-10 gas tubes, which will extend just beyond the center of the cam pin cutout in the upper receiver, and give you just a touch MORE gas timing... This is just another example of a lack of standards by barrel manufacturers, and a BAD IDEA by barrel manufacturers, that don't really understand the differences between the two gas systems - AR15 gas systems, and the Armalite AR-10 (true) gas systems. Different lengths of gas tubes, Armalite AR-10 being longer... So, manufacturers think they can drill gas port locations IN BETWEEN those two gas port positions... "It'll work for most of the people, most of the time, with most of the ammo.... No matter what gas tube they use..." This is a cascading mentality, by manufacturers. "Tolerance Stacking" is what it's called, when you're working with dimensions of parts that have a plus or minus to a size - but this is an oddball way of thinking, in their mentality.... Gas tube is a little short, they put a light buffer in there to save money (because tungsten is expensive), and they just make the gas port too small to run that shiit. Compromises, based on $$$... Sooner or later, YOU are the guy that gets a gun that doesn't run... That's my soapbox on the whole affair...

FRED!!! @FredHilkey - disregard my previous recommendation for the Sprinco Orange spring. Completely. Now that details are up here - and why they're so important in the first place - you have a receiver extension that's 7 5/8" internal depth, and you're running buffers that are 3.250" long. Obviously, that's a pattern of the Armalite AR-10 Carbine recoil system, right there. You just have a shiit spring in there, and that one is weird, both in relaxed length, and coil count. You have two choices for a spring. Armalite EA1095 spring, or the Sprinco RED spring. Both will do the job, whichever you can find in stock.

You still have 4 days. HAUL ASS, BROTHER!!!

You know that I'd much prefer if you did one of these up, instead of the Mossy MVP... I'm just sayin'...

I'll see if GunPusher John can get ahold of one. You're right, though - that's a long shot, brother... What's your barrel-length preference, or does that even matter?... You probably need the Patrol, with the 16.25" barrel... I'm guessing...

The DEWS moniker was the greatest gift ever bestowed upon me, and I didn't know it at the time, when these sneaky fuckers did it. I AM the Dumbass Early Warning System here...

With the amount of guns, and calibers, that you have, brother - you need to be rolling your own. Why don't you reload?

Do me a favor, and try out a Sprinco Orange recoil spring. This one: https://www.primaryarms.com/sprinco-ar10-orange-extra-power-carbine-buffer-spring Sprinco's description: "ORANGE Spring": The ONLY specifically engineered EXTRA POWER Buffer Spring for .308 Carbine Platforms using standard 7" Depth M4 extension tubes and .308 short 2.5" buffers (Including aftermarket "heavy buffers.") You cannot clip coils from any other commercially available buffer spring to yield the proper spring loads for this application, especially in heavily gassed .308 carbine platforms. We started from scratch on this design to provide Operators with a viable alternative to existing OEM and aftermarket offerings. Platforms known to exist using this approach include DPMS, Bushmaster (Post 2010), Remington, CMMG, Mega, SA Defense, Colt 901, Rock River Arms and many others. Color Coded ORANGE. If it doesn't work for you, I'll buy it from you for evverything that you have to pay for it, PLUS shipping to me. That's my Money-Back Guarantee.

Of course, I am. Just ask me.

I'm missing something in here, brother. I'm just not catching it, but I will. Something is going on between the recoil system and the gas system, and your gas port is huge for what you're doing. Go over the barrel configuration again, list it out. 20"rifle gas, 18" rifle gas, gas block journal diameter, whatever. There's something here that's not working with the other parts. Before you drill any more, list out the barrel specs, the total gas system specs, and the total recoil system specs. Oh, and wheredo you think the brass should go? What's your goal for ejection, like, where are you wanting that brass to land, or thinking it should land?

See?... Just one comment gets you two "complete innocents" dragged right in, every time... Here's what I think, every single time I see you two either get dragged in, or just get into it...

That's a first-gen DPMS LR-308, and it was built at the factory and sold from the factory as a complete rifle. The whole "K" thing was only on stripped lower receivers on the original (not the G II receivers) LR-308s. They stamped a K at the very end of the serial number, as a way to identify all the LR-308 lower receivers that they manufactured and sold as "stripped lowers." Now, you need a pic of the upper receiver in here, so we can help you identify if you have a High or Low profile upper receiver. Here's a cheat guide for that - keep clicking it (3 times on my computer) and it gets bigger: @imschur - you'll love the link, brother...

I get it, brother, I do. Yeah, you can make a light buffer work, and we know one company that does it all the time, by telling their consumers that "they NEED an adjustable gas block..." They (the company) know who they are... And they're just putting the band-aid on the wrong cut... I get it, brother.

That's my whole goal here, man - ALL of us here... If you learn how the rifle works, then you know how to fix it when it does "x" or "y". Or, if a part breaks, you can figure out why it broke, and fix that part or situation that lead to the breakage, so it doesn't happen again. Or, if you know the different systems, and how they interact, you can change one, and know what you need to change for the other(s). Writing legibly, and concisely - ever train an Army Private?... Some of those guys can be just like a rock with lips, and you have to get them to understand. I spent more than 20 years training some pretty crazy shiit - and it payed off for me. I can't take the credit for that - that has to go to the US Army, and all those that "trained me to train" in my past. I had some very badass mentors.

You'd have to dig for that stuff - best way to track it all down is by searching out the complete history of Eugene Stoner - and there's not just one resource out there. Here's a good start: https://ammo.com/articles/eugene-stoner-creator-ar-15-americas-rifle-forgotten-history All of the Carbine variants - ALL of them, were "developed by Colt," after Armalite sold the rights and specs to Colt. Stoner left Armalite in 1961, to go work for Colt. So... you know who designed all the Carbine variants... More of his work came out starting in 1990, until his death in 1997, when he worked with Knight's Armament.

IF you guys start digging into Congressional Medal Of Honor (CMOH) stuff - you'll find amazing people in unreal times doing unbelievable things that are impossible - for their brothers, right then and right there, in THAT moment. Scary thing? They're just normal people, from normal places, with normal upbringings. Just reading CMOH citations will make you cry.

Tragically, I have to live with me every single day.

Good push, brother. Side note for Doc, here - Berger 185gr Juggernauts - you better be running the 1:10" twist rate, and they're fuckin' MAGIC!... I still have these for you, brother. No way could I just hog them all up - I saw what they did, and decided to STOP until YOU get here. They're safely stored, until we can meet again, and sling lead. ❤️

Based on the gas port location, barrel length, and the (ASSUMING HERE!!!) 0.750 gas block journal diameter - because you never stated the gas block journal diameter - what I told you before should work. 0.080"~0.083" range on your gas port will have you running, zero issues. If that's wrong, and it has to go up from there - then we will BOTH learn from this... Both the barrels I could find, matching what you state, are both 1:11.25" twist. https://shopwilsoncombat.com/Match-Grade-Barrel-308-WIN-Recon-Tactical-16-1-1125-Twist-Stainless-Fluted/productinfo/TR-308RCIG16FT11.25/ https://shopwilsoncombat.com/Match-Grade-Barrel-308-WIN-Ranger-16-1-1125-Twist-Stainless/productinfo/TR-308RAIG16RT11.25/ That's real cool for 168gr projectiles, and it's the minimum twist rate to run (determined to be the "optimum" twist rate to run) for Sierra MatchKing 175gr projectiles. You run anything heavier, and you're out of twist. Most modern .308 Win twist rates are the faster 1:10" twist. I run that for the 178s that I load, and the 195s that I try... I'll perfect those bastards, one day, and they'll slay dragons.

I need to meet that guy. He might be able to help me with my deer-technique...

Chief, read this. It didn't take 15 minutes to write. It took the better part of 10 years on these things to figure it out.

.308ARs will only run on a 3.8oz buffer if the manufacturer of that gun cheaped out, and made that bullshiit "in-between" gas port location drilling - not AR15 gas port location, and not Armalite AR-10 gas port location - but IN BETWEEN... AND, they'll only run on a 3.8oz CHEAP 2.500" long buffer, in an AR15 Carbine receiver extension - IF... they drilled the gas port diameter TOO SMALL, in order to run that lightass, cheapass buffer... Most of the time, for most of the people, with most of the commercial weakass-off-the-shelf ammo. That seems to be their mantra... "Send it back to the factory, and we'll look at it..." And it returns, THE SAME... "We found no problems..." Of course, you cheapass bastards didn't find a problem... Period. .308AR buffers cost money. They need to be 5.4oz, to properly cycle the firearm. "Enough ASS to control the MASS..." You've heard it enough - you should know better. Any lighter buffer is a DOLLAR COMPROMISE from a cheapass manufacturer, and they're cutting corners in other places just to make that work. Know why? TUNGSTEN IS EXPENSIVE. SO ARE STAINLESS STEEL BUFFER BODIES. Aluminum bodies are MUCH cheaper. Steel weights are MUCH cheaper. I've already delved into this in so much detail, it's not even funny anymore, and you know where those posts are, Eric. You should have pointed him directly to those posts. On your own. You've been here long enough to know that.

That Aero Carbine 308 spring is gonna let you down, badly. Just put the Armalite EA1095 spring in it and be done. With the A5 extension, Clint's buffer, and the EA1095 spring - you'll have a fail-proof recoil system. Any issues you have after that are 100% gas system issues. That recoil system is bulletproof.

PICTURES!!! Post them up. No other way around this, when you don't know what you have - and WE certainly don't know what you have. Post pics of your receivers. Can't think of another fix, but that.

Details matter, Fred. Measure that thing when you get home - the one that's coming out, AND the one you ordered to go back in there. I'm thinking the one that's coming out is 2.500" long - and the one that you want to go in there is 3.250" long. And that's not gonna work with the receiver extension that you have. Hit it when you get home...