dpete

I'll second the 5 round ASC mags. https://gunmagwarehouse.com/asc-ar-10-308-7-62x51-5-round-stainless-steel-magazine.html Out of stock right now.

UPDATE I went to the range again today but this time for an accuracy test. This build was never intended as a long range precision piece but I had hopes of decent accuracy. It has achieved that. The Fastfire III has a 3 moa dot which pretty much covers a 2" square on the target with my eyes. With about 75 rounds through it so far, it is minute of baseball at 50 yards with bullets loaded for my 8" BLK sbr. So far it is living up to the hopes I had when thinking about building it, a rifle round coming out of a package that is about the same size as an H&K MP5.

First outing is a success! The adjustable gas block arrived this morning and I had it installed shortly after. @98Z5V It ran like a top with the gas block wide open. First shot with 1 round in the mag had bolt hold open on empty. Next mag with 3 rounds all fired and ejected perfectly. Then I commenced shutting down the gas. First two clicks, had BHO. 4 more still had BHO. 4 more still had BHO. I kept shutting down the gas until finally I had no bolt movement, I assume gas was shut off completely. Two clicks open and BHO again. Ejection was right at 4 o'clock with empty cases landing about 3-4 feet out. I'm guessing that I have it two clicks above fully shut off and have perfect function. This is with a 3.0 oz carbine buffer and standard spring. Shooting subs with the gas set for supers had no BHO, and I didn't play with it to determine how far it needed to go to get there. The recoil is a smooth push, not a sharp punch like I expected, although I did use my original Sig brace for testing purposes. It was a cloudy day and the birdcage flash hider did its job, there was no noticeable muzzle flash when observed from 20 ft to the side. Shooting it you don't really realize how close the muzzle is to your face compared to a 16" carbine. Next up is some accuracy tests at 25 and 50 yards.

Parts have arrived and she is put together...mostly. I'm still waiting on the adjustable gas block that USPS says is supposed to be here tomorrow. I'm thinking more likely Saturday or Monday considering where tracking says it is right now. If I get anxious over the weekend I may put the standard gas block on it just to see how it runs unrestricted. 23" of pint size blaster 300 BLK

Greasing the spring ends the twang. Just sayin'

Have you shot this rifle in its original gas and recoil system form? If not, do that first to see if it runs. Thinking this or that might be wrong is only waisting brain power until you actually shoot the thing. There is an adage that runs around here that applies to these large frame guns, "DON'T COMPLICATE $HIT WITH COMPLICATED $HIT". Go out and shoot it as it is before you start throwing money at a problem you might not have. If you have a problem come back here with it and folks will get it sorted out for you provided the advice given is listened to.

^^^ That right there will fix you up.

@98Z5V I've got an adjustable block incoming hopefully this week. Just in time for the lower and the rest of the parts to get here. I'de be tempted to put the block and gas tube I have on the upper and mount it on my SBR lower just to give it a test but at 17* outside I'm going to pass on that idea.

All the upper parts showed up yesterday and I'll be putting it together today as soon as I return from getting the BCG from my local gun pusher. With the birdcage flash hider, and KAK pistol tube this thing is going to be 23" long. @98Z5V The gas port is only 3" from the front flat face (front of pic rail) of the upper, and measures .109" in a .75" journal. With the back of the bullet travelling under two inches from inside the case to going past the gas port I'm thinking an adjustable gas block wouldn't be the worst idea. Your thoughts? There is going to be a lot of gas going down the gas tube hitting the BCG unless its tuned down. Mocked up for visualizing. Nothing tightened down.

An option to the birdcage or can is a flashcan to direct all the blast forward. The can I have is a Form 1 that I built with quieting a 308 AR in mind. Its 10+ inches long. It works great on my 8" barrel BLK with subs but it goes against the short concept adding that much length to this little thing. I've looked at the Law folders. Very nice and very pricey. One review I saw stated that it adds about 10.5 oz to the overall weight. Not something I'de like to do. It would be slick to have the folding option but for practical purposes it might save 30 seconds over grabbing the upper and lower from the case and popping the pivot and takedown pins in. I have a laptop case that has been laying around for several years that I'm going to try to use. Yes I've got a chrono and several flavors of 300BLK reloads to put to the test.

It seems to me that when I discovered the differences in the tubes you were busy out at the SDTF up to who knows what kind of shooting and other shenanigans. A bit busy in other words.

@98Z5V Its going to be a bit unique because of using the KAK Sig brace buffer tube. I held it up to one of my other rifles with a standard 7" ID tube and the KAK is 2" longer! I thought WTF, never gave it a second thought when it was installed before and it worked just fine. Tonight I pulled out a tape measure and found out what is up. The tube is 9" end to end exterior length, and 7" interior length. The thing has a 2" long aluminum plug in the back of it. WTF solved. Being as long armed as I am I might just add a bit to it before sliding the foam pad on. Lord knows I've got enough solid aluminum at the back for a screw to grab on to and hold my homegrown extension in place.

Thanks! I also have a SBR lower I can slap this little bugger on for those super short rifle moments. I might have to break down and camo another AR so this one matches the others I have.

Definitely not a human baby, I'm way to old for that nonsense. A micro 300 BLK pistol build. 5" barrel w/micro gas, 4" handguard, KAK round pistol buffer tube that will get either a foam pad to start, or my original Sig brace later. Sights will be the Burris Fastfire III I already have with Magpul flip ups front and rear. Everything in between will be standard AR15 fare. All the parts are inbound right now. The big question mark right now is muzzle device. A standard birdcage flash hider is what I'm starting with, but I might get a flash hider I can thread my suppressor on to. This thing should come in somewhere around 22" total length and hopefully will turn into a fun little blaster and truck gun. I'll see how it does with the 110gr Varmageddon loads I have for my other BLK or I can always make up some special loads for it. An almost life size picture of what the upper will look like.

Sounds good! As long as the turbo encabulator doesn't overcharge the tubular gas re-energizer enough to blow up and become a gonadal emasculator. That would be BAD, VERY BAD!

Is that like splicing in a flux capacitor?

Yeah. We don't help people spend time but we sure can help spend money. Especially when its someone else's. Welcome from WI.

Some know a little, just enough to give wrong info. A lot of folks at M4C are still "if it ain't Colt or BCM its crap" kind of guys. I generally skip the AR15 threads and check the Beyond 5.56/.223 section a few times a week. Usually not much new there but once in a while there is a post looking for help on a large frame so I send them over here.

That might have come from me. I've sent a number of people over there to here. Welcome!

The mailman brought a box today and this is what was in it. Its on the bench warming up as I write this and I'll have the first loads out of it yet this afternoon. I'll see how it runs.

There, I fixed it for ya!

DEAL! lmao

You bastidge! You just had to go and say things like that! They are on clearance now at Graf and Sons for $245 because the Chargemaster Link is coming out that has bluetooth technology(why do I need that?). Grafs also had .243 and .270 bullets in stock that I need for the key rings, so I pulled the trigger on all three. You fukker. Now I'll see how it measures up to the scale and system I have going now. I owe you one hell of an enable.

I've sent a couple guys here from M4Carbine.net who were getting answers all over the place on what was wrong with their rifles. I pretty much tell them "Go there, describe whats going on, ask your questions, then LISTEN to what your told". You'll get a rifle that works.