r/AR10

A few years ago, I received this Ruger SFAR 308 as a gift from my father. At the time, I neither had the time nor the place to really sort it out.

Recently, I mounted up a scope and took it to the range… to be immediately disappointed. I’ve never owned a rifle that simply refused to run.

I went back and did a little research to discover that significant break in was required, and that even after, many rifles seemed to suffer from tight chambers and finicky gas systems.

I decided after my research to change… nothing. I simply trudged on through operating failure upon operating failure with all ammo types… expending hundreds of rounds, cleaned it vigorously, and lubricated it excessively.

And then this week… a breakthrough, on two separate occasions. Now it just runs and runs… all ammo types - setting 2 or 3 with no problem whatsoever.

Here’s what I feel like I learned:

I should have saved myself $400.00 of ammunition and spent that money on an upgraded gas block immediately.

This rifle needs to run clean, very clean. It also needs excessive lubrication.

I appreciate the tight tolerances of Ruger production, but all it resulted in was creating a diminishing return on value.

I didn’t buy it… but if I had I would certainly not recommend you do. Spend the extra money on something that runs right from day one.

Just scooped this LT10 on a trade, 18” 308 match grade upper. First rounds I’ve put through it (allegedly sub 300 round count before trade) with FGMM 175g center strike OTM. Needless to say, very pleased with these groups for a gas gun.

This leads me into my question, as it seems there’s not a ton of Larue large frame info out, and if you ask marky mark it’s proprietary and you have to use their barrels but, looking for info on barrel swap compatibility if anyone’s done it. I’m not in a huge rush but would like to have a 6.5 creed barrel to swap into the rifle in the future. Have my eyes on criterion and proof. If anyone’s done a swap in one of these with success what barrel and bolt did you use?

I'm trying to get my PSA AR10 back up and running, and the newest problem is the head of my Presma (I think) action rod is spinning.

It came loose trying to get the old PSA barrel off, and now that I'm trying to install a new Criterion barrel, it spinning at well below 40 ft-lbs.

The black holes just below the head do not have set screws or anything I can tighten in them, just some sort of weird press fitting.

My first thought is to simply drill one or both out, fit an aluminium or steel rod through, and call it a day.

Any thoughts?

Hey guys, looking for some advice. I have an aero m5 with a 16" Rainier Arms match 7.62x51 barrel, that I built myself and installed a surefire warcomp on with the correct torque. It was fine like that for years. Recently, I decided to switch out the warcomp for a rearden suppressor mount. As I was removing the flash hider that I had torqued to ~30 ft/lbs, the barrel extension came loose. My understanding is that an extension should be torqued from the factory to ~150ft/lbs and it shouldn't be coming loose under these fairly normal circumstances. Also, it seems as though the gas port is indexed at 12 o clock when roughly hand tight, so retorquing the extension would lead to other issues, including head spacing concerns.

So I have a few questions. Is the barrel toast? Buy a new one, because a gun smith fixing it would be more expensive? Should Rainier Arms cover this under warranty because it was torqued incorrectly from the get go? Any insight would be appreciated.

Everything is always out of stock everywhere.

Edit: this was posted in the comments RIP aero 😂

https://blog.roninsgrips.com/understanding-the-2026-receivership-of-aero-precision-ballistic-advantage-stag-arms-and-vg6-precision/

I think it can group a little tiny bit better, I was shooting unsupported in the rear . I found this rifle has preferred the federal, but it would occasionally get hung up on the flat tip of their center strike round.

This is my first build. Please let me know what y'all think.

Here it is! Knight's SR 25 with 16" inch barrel chambered in 6.5 creedmoor. The scope of choice is the Tangent Theta 525 Gen 3 XR mounted on QD Spuhr.

Still waiting on the supressor and cover!

I'll be using an accutac bipod as well!

Thank you for the people who helped! My next build will definitely feature a Leupold but maybe next year and on MRGG or a bolt.

My DDM4V7, I love this machine so much!

This is kind of a silly way to describe it, but if I’m investing in a nice AR10, I don’t want it to be “just another” AR15 in my safe that just happens to be chambered in .308. Hope you guys catch my drift because it makes sense in my head. Examples being sig tread and DD5V3

Building an AR-10

Picked up a Centurion Arms MK11 16in.

Inspecting the barrel prior to install I noted a dark spot near the threads. Ran a bore snake through multiple times, nothing came out. Same dark spot.

Sent the barrel to centurion arms, they said they found nothing and are shipping it back to me. Great customer service experience.

I’ve built countless rifles in my life, this is the first time I’ve ever seen a barrel like this. Has anyone seen something like this on a brand new barrel before?

I trust the manufacturer, however this just feels strange.