shooterrex

Aero can tell you what they think the gas port diameter is but the only way to know for sure is to measure it yourself.

https://www.armalite.com/SACItem.aspx?Item=AR10REKIT01&ReturnURL=/Armalite/Product-Category/AR10-Parts-Accessories/Lower-Receiver-Parts&Category=ac614400-ff09-4cdf-9d35-419a654e7201

Please drop by the introduction section and tell us a bit about yourself. No need the post the same question in multiple threads. I answered you question in the other thread.

Your 9mm should be blowback and not even have a gas system. 9mm buffer is way longer than milspec. 9mm buffer spring is usually stronger than milspec. If you built a different upper you would still need to change the spring and buffer.

If the web says out of stock call them. https://www.armalite.com/SACItem.aspx?Item=AR10REKIT01&ReturnURL=/Armalite/Product-Category/AR10-Parts-Accessories/Lower-Receiver-Parts&Category=ac614400-ff09-4cdf-9d35-419a654e7201

That recoil system is not good. You need a heavier buffer and a proper spring. Still need to know what diameter you gas port is?

Aero uses 3.something oz buffers. Not enough weight. What is the size of the gas port? Wide open adjustable won't do any good if the port is too small.

Nice to find factory ammo that shoots well.

If it is new you may just need to shoot a few more rounds till the gas block seals up. What is your recoil system?

Look at your extractor. Look at your extractor springs. Is the ejector rounded on the edge and not flat with a sharp edge?

Marksmanship is all about doing the same thing the same way EVERY time.

Glad you got it figured out.

Bottom hole takes the spring and plunger for the bolt catch. Threaded hole take a screw that holds in the little bracket that holds the bolt catch.

No idea. But I do remember the thread and he found a bolt catch.

Not sure where the thread is but someone else had need of the same type bolt catch. They found one somewhere. If you search bolt catch threads you should find it.

Check and be sure your gas block is still where it is supposed to be.

I think there were spoons for M14 mags. They might fit your mags I don't know.

Yes it has sightline over bore. Think I read the table wrong. Supposed to be 0.5" low at 50yds not high.

Ok I sighted in at 50yds 0.4" high. Balastic program says that's what will make it dead on at 200yds. So why is it shooting 4" high at 275 yds? Am I missing something. This is my 6.5 Creedmoor. I only have targets at 50 ,89, and 275 yds this time of year with crops in The field. Shooting Hornady American Gunner 140's

Quit changing multiple things at once. How are you going to know what actually solves your problem Till you get a proper spring and buffer you are just beating your head against the wall. The proper recoil system will slow down the cyclic rate. Allowing the brass to shrink down enough to be extracted. Till your recoil system is correct the rifle will probably not run 100%

Welcome from KY.

Yes your phone is a tracking device you can also make phone calls on.

Looks good. Now go shoot it.

Yep I taught a buddy's wife to shoot cuz she wasn't going to take instructions from him. My buddy w/a Russian wife had me teach her how to drive. They would have killed each other over that job.