98Z5V

Just list out what you're doing then, if it's all planned out. I'm sure you've got all the projected weights, etc., on hand already. Check out some of Breaststroker's work on lightweight builds. Not really practical, but quite light. Sub-5lb .308AR, I think? The Xanthos is 16oz combined, stripped upper and lower. That's the lightest out there right now, unless something else popped up recently. Once VSeven starts making the .308 stuff in their billet 2055 Lithium/Aluminum, it'll blow everything else out of the water.

If it locks in with the upper removed, that means the mag feedlips are contacting the upper receiver cuts, and the upper receiver is keeping it from locking in. If it doesn't lock with the upper removed, that will mean you need to check the cutout on the left side of the mag - something there is stopping it from locking. Or the pad on the mag catch is Yuge... Things to look for... Just pivot the upper forward on the pivot pin, and try to lock the mag. If it goes, then try to close the lower and pin it with the takedown pin... SOMETHING is gonna happen...

Nothing you can't account for with the proper drop of the load you're using. Once you know how much it drops, you can run it out there just like anything else. I've got a 13.5" .308 with a red dot. For shiits and giggles, I'll put a magnified optic on it and run it out to 845 and see how it does. I know I have a 14.5" 5.56 gun with a red dot that'll do 575 yards. A 12.5" Grendel that's suprisingly accurate at that 845 yard target. It's the drop, dope, and holds, man. Just find out where it goes transonic. Any distance after that speed is a crapshoot, unless you have a badass ballistic app to run it out further.

Not true. I just finished a .260 Rem and nothing is adjustable in the gas system, or fancy in the recoil system. That cartridge is a virtual twin to the 6.5CM. Runs great without complicated shiit getting in the way.

I like mine one of two ways - either will do... Bitter and Murky Sweet and Creamy

You go, SS. You stick with that.

Welcome aboard - whatever happens, we can solve it. List the specific parts in a build thread, and ask questions about certain parts before you buy - we'll be able to figure it out beforehand, and not waste money.

That would be great for comparisons, and info. That'll work out beautifully.

They did some pretty weird stuff with carbine recoil systems, man. I'd did into that thing and measure it all out, and see what you have. I'm talking about - I personally looked at a PA-10-marked receiver extension that was 8.000" internal depth... Look for impact marks on the ears of your lower receiver, that will be from the body of the BCG slamming into it. That's a bad sign, but a definite sign that it's got big issues.

@survivalshop, here is my most recent recommandation, just so you know:

That's what you READ when we say it - and you're interpreting it wrong. That's on YOU, buddy, no one else. When people ask, I will tell them that I can guarantee that I can list parts that WILL work, if they get the parts I say - and I give them part numbers to search for - and guess what? They WORK! Every single time! You want a carbine recoil system for your Big AR that won't let you down? Buy Armalite AR-10 parts. They work, every time. Find these part numbers... I even state OTHER receiver extensions that will work, and I tell people to get ANY AR15 H3 buffer? You go run out here and try to tell people that they need DPMS parts to get their recoil system running - and most of them are going to tell you that they HAVE DPMS parts already. YOU take up that argument with them, and explain the difference in DPMS factory parts, and the amount of JUNK that's out there on the market. Shiit, almost everything a vendor lists is "AR-10" in the listing, and it's DPMS-Based... You fight that fight - it's not worth it. Meanwhile, I'll recommend parts that work, by part number, and include variances that work, too - just like I always have here... So, how is that an Armalite pusher?!... Are you nuts? I don't even own an Armalite AR-10 , man, so quit climbing up on that horse, so you can fall off it again. I'm not an Armalite pusher. I push parts that WORK... I hope you understand that.

You can disagree with Eugene Stoner all you want - he designed it, and he designed it before DMPS bastardized an AR15 part to make a 308 with a collapsible stock on it. If you have information otherwise, please post that first DPMS LR.308 with a collapsible stock, that came before the AR-10 Carbine. I'll be waiting... Disagree as much as you want - that's the ground truth, right there, and it was designed to operate on a 5.4oz buffer. Period. DPMS made a bandaid, in order to put AR15 parts on the 308, and they did their homework, and the straight-from-them big carbine recoil system works. That doesn't mean that everyone gets it right, now does it? Hardly any of them CAN get it right... Tell me I'm wrong... Please read CAREFULLY what I stated, SS: Now, in that confession, straight from me, did I acknowledge that DPMS gets it right? You're damn right I did. However, you have to go throw this out there, because you didn't read what I stated... "If you mean..." I did NOT mean that, and if you read what I posted, you would know that. So, here's what I'd like to see - you find me ONE DPMS-BASED Carbine Recoil System that doesn't have problems, that is NOT using DPMS Genuine Parts. Just to be clear, and ultra-clear to you, DPMS LR-308 Carbine springs do work, but only with a 3.8oz buffer. OTHER OEM springs from OTHER OEM MANUFACTURERS USUALLY SUCK, AND DO NOT WORK. Happy?

This is your chance to turn that Lesson 65B around, brother...

Personally, here's my opinion. Don't complicate shiit with complicated shiit. I'd fix your recoil system with stardard, functional parts, and not worry about it. As soon as you start tossing all this fancy shiit in there, you're diagnosing more problems, downstream. For JP - run the whole system, including LMOS BCG, or don't mess with it at all. For the SRS - go read some reviews, man.

If you go Armaspec SRS, pick the proper weight. I'd go for what should be in it, not comparing what is in it right now (because that's too light).

Be a hell of alot of fun to shoot, with that Razor HD on there. If it was me, I'd put a LaRue LT-158 mount on there.

M249 SAW with the 200-rd drum in it. I was a little distracted by the background, but I've handled those enough to know just what it is...

Yep. I have one 19-rounder that needed the feed lips tweaked.

Shiit. We need to get you in a DPMS-based gun now...

The problem with these 3.8oz buffers (Aero doesn't make a bad one - it has two tungsten weights in their aluminum body), comes down to the springs. Carbine recoil systems will run on a .308AR (DPMS LR-308s prove that). All these manufacturers think that they're gonna make the next, greatest thing, and make everything in-house. They don't get the spring right. Buffer weight is 3.8oz, which is as heavy as they can make it without spending money on a stainless buffer body, and just using tungsten weights. The biggest issue that you'll see is what everyone calls "over-gassed." "My AR-10 is over-gassed! I need an adjustable gas block!!!..." First, you have to inform them that it's not an AR-10. AR-10s don't use that type of recoil system construction. AR-10 Carbine recoil systems work every time... The next battle with them is informing them that they do not "need" an adjustable gas block, because they are not "over-gassed." They are actually "under-recoiled." The recoil system is weak, and not up to the task of handling the .308 Winchester rounds (and just about anything else we can shoot in this frame type). The recoil system was designed to be run with a 5.4oz buffer as it's primary operating weight, inside a receiver extension that's 7 5/8" long. Any change to either of those dimensions requires a complete change in the three system components. Most common change is the receiver extension, and the use of the AR15 Carbine receiver extension with it's 7.000" internal depth. Next "victim of specs" is the buffer weight - it goes down. It has too, because it needs to be shortened to 2.500" long to work in a 7.000" extension. What's the final thing that manufacturers can't get right? The operating spring. Most .308AR OEM Carbine operating springs are junk. Once you understand the difference in what you have and what you need for a recoil system, it becomes more clear on what's really going on with your rifle - it's not over-gassed. It's under-recoiled. Adding the adjustable gas block puts the bandaid on the wrong cut...

Going on that .260 Rem, too.

Early C-Products?

bubba, can you lock that mag into place with the bolt locked to the rear? LOCK it in there? If not, can you lock it into the lower, with the upper removed from the lower? Those answers are gonna tell you where the issues are.

Fucking smartass...