98Z5V

I have a .308 Win AR with a 13.5" barrel, and a red dot - and can hit IPSC steel plates at 400 yards. My .338 Fed AR has a 16" barrel, and a 1~6 scope, and can do the same. The .358 Win AR souldn't have any issue at all connecting with something that's "hunting vitals) sized (7" or 10", depending on what animal you're after) at 300 yards. A 19" barrel is WAY overkill for that kind of maximum distance. Accuracy is accuracy. Your barrel is either accurate, or it's not. If it's accurate - it doesn't matter how long or short it is, for what we do. This isn't Bench-Rest F-Class Competition here. If it's accurate, but it's shorter - it has less muzzle velocity. I can dial in my scope for muzzle velocity changes, at distance, and still be very accurate. At 300 yards, though, it really doesn't matter. Wind doesn't even affect your round at that distance, unless you're shooting in the middle of a tornado.

That ramp combination shouldn't cause a huge problem. Dremel Chainsaw Sharpening Bit would match that upper to the ramps in the barrel, in pretty short order, though. I think the issue is "new gun" + "mechanical engineer" = problems that aren't problems. Lube the gun up very well, shoot the hell out of it, and most of this will go away. Windham Weaponry = Bustmaster. Once Freedom Group and Remington bought out Bushmaster (the new BM stuff is based on the DPMS LR-308 platform, and good)... Once bought out, Freedom Group closed the factory, pissed on all the workers, and relocated Bushmaster to another state. The old Bushmaster workers got involved, bought the old factory back, and resumed business as usual, under the new company name - Windham Weaponry, in Windham, Maine. Here's their history: https://www.windhamweaponry.com/about-us/company-history/

Almost all of us here are from the US - so we might not be able to help with your problem. Depends on what it is. We have a few Canadian members here that are VERY WELL versed on Canadian specifics, though. Welcome aboard.

@BeeKay - what are you going to use this gun for? I'm not dogging your barrel choice, not at all - please don't think that. I'm just asking questions here. The .358 Win is not a long-range cartridge. It's a hunting caliber. I'm going to make mine with a 16" Wilson Combat Ranger barrel, weighing in at 34.1oz. That's great for hunting - shorter, and way lighter than the barrel you're going with. 19" barrel and 44-ish oz - that's alot of swing weight. FWIW, barrels don't care what upper and lower you use. Just don't care. If they're made right, all barrels will work. The 80% lower might be the only issue that you run into - and you must find a compatible upper for it.

I haven't read any accuracy reviews on KAK barrels, but maybe that's because I haven't looked. But the Wilson Combat Match Grade barrels hae reviews everywhere, and I've written my own about them. Match polished chamber, final lapped barrels... You'll be hard-pressed to find a better production barrel in hunting-calibers, than the ones that Wilson Combat makes. I just asked a question, on why you went that way, over the Wilson Combat. You answer was "I don't know that it is better." I'll bet it is, hands down, but that's just me speaking on my experience with two WC barrels. It's just the quality that WC puts into their own barrels, that they make in-house. They really are Match Grade barrels - and they're not that expensive, for what you get. That's just my opinion, on my own experience.

Sorry, @CorpsTex, but your information is not correct. We've come a loooong way in buffer-work on this board since 2015, when this thread was started, and finished. He clearly stated that he had a 7.000" internal depth receiver extension, so that's an AR15 Carbine Receiver Extension. To function on a .308AR, that extension must use a 2.500" long buffer. Buffer weight is another matter that we've gone through here, through the years. Now, if he was using a Rifle Recoil System, that receiver extension would have an internal depth of 9 11/16" (both .308AR and AR15, and both varients of AR15, being A1 and A2 stocks - exact same Rifle receiver extension), and he'd have to use a buffer length of 5.200" long - not the 5.300" long, that you stated - that extra 0.100" makes a BIG difference on alot of these builds, believe it or not. That extra 0.100" (depends where you put it) can make your gun run like a dream, or completely fornicate-up. Having it in buffer length, when it's supposed to be 5.200" long - is not a great idea. .308AR Rifle Buffers are 5.200" long. AR15 Rifle Buffers are 5.900" long. If your buffer is different from that - then who made it?... It's not what it's supposed to be, I'll tell you that much... But that doesn't matter - he had a Carbine Recoil System. You're referencing (loosely) a Rifle Recoil System. Now, on that Rifle Recoil System, you're telling him that he needs to have a spring length of 12.50". What's the wire diameter of that spring, and the coil count? The best spring to run on a .308AR Rifle Recoil System is the Armalite EA1095 - they pioneered it, they make it the exact same every single time, and they QC it. It's the best "factory" spring that you can possible buy. And it measures: 34 coils at 0.072" wire diameter, 13.750" long, relaxed length. So, I have to ask - who made your spring, and do you really know it's right? It's nowhere close to what the original designer of this rifle made, and stated was "correct" for a Rifle Recoil System. I'll agree with your assessment that his buffer was too long - it was probable an AR15 Carbine buffer, at 3.250" long, and not a DPMS LR-308 CARBINE buffer, that should have been 2.500" long. That was probably it. The rest of your data is off, and I don't want to see others here (new people) repeating it, and stating it as fact. Hope you understand that.

That statement is completely false. You can't adjust the headspace on an AR barrel - that has to be precision machined, and performed, when building the barrel - by the barrel maker.

Which KAK barrel are you buying, and why is that better than a Wilson Combat barrel? I will eventually build a 7mm-08 AR and a .358 Win AR, and Wilson Combat will be the barrels I'll use - based off my past experience with the Wilson Combat .260 Rem and .338 Fed AR barrels.

.358 Winchester?

Wide Open. And you need to shoot several boxes of ammo to break the gun in, before you start making ANY adjustment downward, in gas. You need the carbon fouling to seal the gas tube to the block, the block to the barrel, the end of the gas tube to the gas key on top of the BCG, all moving heavy-metal parts need to start working together... You need to break the gun in before you start messing with the gas, and you start it Wide Open. Think if you start it closed. Then you start opening it up, click by click, of whatever adjustment yours has. You go through two boxes of ammo, and it STILL doesn't function... Well, is it broken in yet - or is your gas port diameter too small?... You don't know. And you wasted two boxes of ammo to get to that conclusion, too. Where ever you got your information that you start out with it closed - obviously had gotten lucky. That's some pretty bad, misguided information, right there. Always load ONE ROUND on a new magazine, on a new build (that is lubed very well), and shoot one round. Adjustable gas block or not. If it doesn't lock the BCG back - then you know you're heading into a situation that you might need to figure out. "Broken in, OR, New Build, OR No carbon fouling to seal things up yet, OR..." ^^^ You'll never get there, starting with that gas block shut down.

This little guy is at the end of the main road, right by the house here, brother.

Let us know who it was that recommended that... You bastard...

Want some rain brought? Build your own gun, from reputable retailers, and reputable manufacturers. Build a gun on Aero M5 receivers, and go from there. Nothing else that we've seen had been as consistent (in an overall platform that has ZERO CONSISTENCIES) - there is NO pattern to follow. Aero Precision delivers, every single time, and they don't fuk it up. Buy a gun? If I had to buy a gun, I wouldn't buy a complete Aero Precision rifle. Yeah, that hurts. Truth, though - I'd buy an Armalite DEF-10 gun, and figure that thing out later, for what I wanted to do to it. I'd "personalize" it later. It WILL work out of the box, every single time, with whatever ammo you throw at it. You can pull a DEF-10 for about $1k, and it's got a solid recoil system already on it. It's got the properly-lengthed gas tube for the barrel, and it's got the properly-sized gas port IN that barrel... The only thing left ISN'T figuring out how to get it to run right - but the personal stuff that you want on it. Now, for the record - I have 7 of these things. I do not own a single Armalite AR-10 rifle. Not one. Not even. The closest I can come is using all Armalite AR-10 internals (barrel, BCG complete, recoil system, gas system) to build into a set of Aero Precision M5 receivers - just to prove that Amralite AR-10 guts DO WORK in the Aero DPMS-based receivers. I will note this, though - of the 7 builds, 5 of them DO have Armalite AR-10 Carbine Recoil Systems, one has a DPMS LR-308 Rifle Recoil System (but the Armalite AR-10 EA1095 recoil spring in it), and only ONE has a hybrid system that I built up, just to test the AR15 recoil systems in .308ARs. My testament to Armalite AR-10 Carbine Recoil Systems runs deep, but with a purpose. My testament to using Armalite AR-10 Recoil System components in whatever recoil system (rifle or carbine) has a reason. If you run either of those recoil systems, and your gun don't work... it's NOT the recoil system that is the problem. If the gun don't work - look at other problems with your gun - most likely the gas system. Adjustable gas blocks should not be something that you "need" to look at to get your gun to run. If the answer to whether your gun runs or not is "gotta have an adjustable gas block" - then that is NOT the problem with your gun. There's my $0.02.

You took long enough to reply - you had to have seen that days ago when you were here - but you didn't respond then. Why is that? You were here numerous times since he posted that, and you were quoted in it, so you had that notification, as soon as you came back onto the board. Yet, you waited to make a response...

Honestly looks like a fucked up design from a company that made a side-charger. Why would they even machine that into the upper at all, if it was a true side-charger? There's no reason for it to be there, in the first place. They put the Band-Aid on the wrong cut, here...

Right on - it certainly shouldn't, not at all. If that's the case, I'd Rock-Sett that bastard in place. No Loc-Tite at all, straight to Rock-Sett. But that explanation from BCA still doesn't make any sense, at all... No sense at all...

My heavy-drop gets here next Monday... I can't WAIT!!!

I saw my little Burrowing Owl today coming home from work - same spot. That's his den, for good. I'll try to get another pic of him in the next few days. His head was poking out of the hole when I turned the corner there, so I turned around. When I pulled back up, he popped out of that hole and took up the same defensive posture as the pics above. He's a badass!...

The PPU Match loads are really good - I like those alot. They just work, like they're supposed to, and they're consistent. Good stuff.

The paracord "trigger job" does quite well at smoothing those things out. Takes away the grit feeling.

^^^ He nailed it. That's M-LOK. Few different ways to go - you can M-LOK a piece of picatinny rail, or just straight-mount a Mag-Pul M-LOK bipod to the rail. I have a bunch of these bipods, and they're damn good. Another option, if you want to mount a Harris (or similar) and need a sling stud - M-LOK sling stud adapter. I have some of these, too, and they work great:

He's still the King. There aren't any Snipers these days that could do what he did. Old school guns, and alot of badass talent. No so these days, no matter how someone argues it. Nobody these days could take his equipment then, and make this happen, unless it was some modern reality show... Check it: https://www.thefirearmblog.com/blog/2016/07/28/for-35-years-the-longest-sniper-kill-was-with-a-ma-duece/

What a pioneer, and perfect practitioner of the art of longer distances...

^^^ Legendary Badass Motherfucker, right there.

Thanks for your concern, but I might not have been mistaken at all - if you had researched here before you dumped that money into the Gibbz. 4 out of 4 reports here that it doesn't work, and problems reported here. Check that out, when you have the time. You only need to search on "Gibbz" and it will all come up, here. Use the quotation marks in your search. Just so you know, there is one maker of a left-handed BCG, and it's for an AR15. Stag made it. Here's a picture: Here's the link to it: https://www.stagarms.com/5-56-223-left-handed-bolt-carrier-assembly/ No one else has done this for any other AR15. And no one has done it for the .308AR platforms. I think you're the one that's mistaken. Maybe I'm wrong. Prove me wrong.