98Z5V

0.670" on an Aero standard M5 lower, upper and lower not purchased together; purchased at different times. 0.660" on an Aero M5 matched set, limited edition ASO set. 0.660" on an Aero M5 matched set, Flag Edition set (the .260 Rem). 0.640" on the original Matrix Aerospace, that is the direct copy of the Ruger SR-762 receivers. Matched set. There's another AP set that's buried, and the original DPMS LR-308 "K-Serial" gun is buried WAY DEEP. I'm not digging those out right now. Those numbers tell me some things about attempting to measure this stuff against a known or published number.

How did a 5.56 guy blow open a thread from 7 years ago - on a .308AR forum?... HOW did you get here?!... 🤩

I wish you could have read my post on gas tube length, gas port postitioning, and everything else I dumped about - that was here 2 days before you posted. It explained it all. That explained exactly why everyone blows off the "short gas tube deal" but why it matters. "M'eh, it's nothing..." It IS something, if you understand this platform.

I did manage to snag one of these tents - but am still looking for another one. The one I found was in the Casa Grande WM store. They didn't have 2, or my search would have been over right then. It was $49 even, plus tax.

Internal depth is 1/8" too short, your buffer is too long... Those two issues together make a weapon that won't cycle. This certainly isn't helping the cycling, or picking up the next round. You had those issues early on? Now, it doesn't cycle...

This right here. That that's a factory upper, so that's aBallistic Advantage barrel. Something is going on, bad - and it's not that second o-ring on the extractor, OP - don't take that out, it's not going to make a single difference. Call a tech rep at Aero, tell them you have videos of the malfunction, and get an email address to send that same vid to. Or, you can send me the upper, and I WILL figure it out quick,ly fix it, test fire it on vid, and get it right back to you.

Dick’s Sporting Goods reports $150 million in lost sales after halting assault-weapons sales https://www.foxnews.com/us/dicks-sporting-goods-reports-150-million-in-lost-sales-after-halting-assault-weapons-sales

They fixed it then - good for them. I'm glad to see that it isn't 7.100" internal, which will make the BCG hit the ears on the lower. Remedied, solved, fixed, on their side.

I would like to know the internal depth (at the top of the extension) on that Aero receiver extension. The only one that I've ever had from them was 7.100" internal depth, for their M5-labeled kit, and it caused me all kind of functional problems, before I traced it to that...

FUK!@!! NOW I remember...

You need to post/host that vid of the BCG not moving, as well as get pics of your brass up, in this thread...

What barrel are you going with on this thing, again?...

He never stated his BCG doesn't move at all - he only stated that spent brass isn't getting out of the gun. First culprit is the BCG length, and that's the quickest thing to solve, by cutting down the poly bumper on the end of it, until that buffer assembly is 5.200" long. The extractor setup isn't the issue, as AP told him - those dual o-rings provide some SERIOUS force on the extractor, and I can say it works, well, myself. The brass isn't getting out of the gun because the BCG is too long - right now, pending internal depth on the rifle receiver extension. The BCG isn't cycling far enough, and screwing everything up - IF the extension is 9 11/16" internal depth, and screwed in all the way...

The cam pin cutout is not in the right place, if you had to round the edges of your cam pin to get the bolt into battery. The better option would have been to take material from the rearward edge of the cam pin cutout, to get the cam pin to clear it. There's plenty of meat in the upper there, to do that.

You can do it with a red dot - this is how we started, Army-wise, with red dots. Aimpoint carry handle cantilever mount.

What upper receiver did you use in your build?...

1. Thank you for the Thank you. We will solve this. 2. Are you absolutely positive on that buffer length? That's 5.313", and it's too damn long. .308AR Rifle Buffers are 5.200" long, so that's an extra hundred thou + that's screwing you up, right off the bat, and that DOES affect cycling. I have a solution to solve this quickly, and at least test the rifle. If it's truly 5.313" long, sand that bastard down to 5.200" long (or file it). Attack that poly bumper on the end of it. If it cycles after that - get a new buffer that's the correct length. For now, don't even worry about that spring... I'll address that spring if we can solve the function of the rifle, first. 3. Good - run it WET. I'm talking about almost dripping-wet, too. .308ARs need ALOT of lube to break in and function. Lastly - will you measure the internal depth of your receiver extension for me? Measure at the top part of the extension, not the base, where the buffer retainer pin is. Top, only - that's the only thing that counts. Stick a tape measure down that until it bottoms out, grab the measurement at the end of the extension - and the extension should be flush with the top of the lower receiver ear. If it's less than flush, it's not screwed in all the way, and we can address that, too. You should see a measurement of exactly 9 11/16". Not more, not less. Right on the money. Lemme know...

Forgot one thing about the SS'19 Shoot = JB Matt. On Sunday, he went nuts on the .260. I think he went through 4 x 20-rd mags. He was literally putting a smilie face on the 300-yard target, after it got fresh paint - I WISH I had a picture of that, because it was a pretty good face, and it was damn funny watching him do it. He had such a good time with that gun - that he has everything getting delivered for his own next week... He's going 6.5 Creedmoor on his, because he has access to an abundance of 6.5C brass. In the next 3 or 4 weeks, we'll get that thing out and shoot it at distance. Might as well zero it, break in the barrel, and whack 1k all at the same time.

What's your gas block diameter?

This is 1:45 long, and I'm not talking minutes. It's worth the time, to figure out the time to watch it.

Completely lottery, very small numbers, and very hard to get drawn. Perfect game management, in action, and it's tough to get.

Mulies and Coues... Gotta get up north for both, or way east.

Deer Meat For Dinner! Sidetrack - there's a guy on YT, and that's his handle. Look at some of his stuff - it's awesome. He showed me how to skin/butcher an alligator, and it was cool as hell - and I'll never see one of those bastards down here in AZ... If I do, I'll know how to deal with it... but I'll suspect Foul Play...

That's gonna be a very, very tough nut to crack. It comes down to gas block diameter. This gets weird, but gas block diameter plays a huge part in gas port diameter, and different gas block diameters will have different gas port diameters, in the same configuration. Examples: 16" rifle-gas is hard enough for barrel manufacturers to get right, so very few do them. Fulton Armory was one of the few that pulled it off, with a 0.936" gas block diameter and a 0.105" gas port. It's a pressure threshold that you're looking at, but Fulton nailed it. I can give you the calculation if you want it - but it's not going to help find a barrel. You'll have to find a custom barrel maker that would tackle something like that. You might be able to buy a barrel, and send it to ADCO to contour for you, into a pencil-profile - call them first, though, and see if they'd even do that.