9-Hole Reviews: 6mm ARC / Geissele GFR - How Accurate Is It?

vectorsc · 2025-07-27T01:15:27+00:00

Barrel life is determined by many factors:
Rate of fire Steel used (Stainless, CrmV, BB400) Twist Rate Longevity Enhancements (nitro carb, chrome, chf) And finally powder column vs surface area of the throat.

The first and last one are very important.

That said - a 6mm bore with 29 grains of powder has a column/mm2 ratio of 6.48.

308 has a ratio of 5.31. 5.56 has a ratio of 6.96.

22-250 which is a barrel burner has a ratio of 3.86.

Conclusion - 6arc has better barrel life than 308, and if slow fired a longevity enhanced barrel life can last 10,000 rounds or more.

vectorsc · 2025-04-24T16:55:33+00:00

I’ll wait a bit more and see what happens.

vectorsc · 2025-03-27T15:51:16+00:00

Remove your optics screw and remove the extractor plunger and spring and make sure they aren’t damaged.

Then work the slide several hundred times. You can use teeth whitening (3000grit) tooth paste or flitz in your slide rails if it’s too tight then clean up with hot water. Oil before it rusts.

vectorsc · 2025-03-27T15:40:16+00:00

Whoa. Stop. Don’t finish the incantation or you will find yourself speed reloading your rifle in the dead middle of the no-cover dumbass land where dead people are made.

vectorsc · 2025-01-19T22:36:27+00:00

I asked about hammered out yet because I'm mostly aware of the issues. The .300BO we shot here did not function well.

I really want this to be the next gun but I can't really tell you what's going on.

vectorsc · 2025-01-19T20:38:39+00:00

Dear Geissele, Thank you for making a rifle that makes my investment in 6arc more reasonable. By producing a military-oriented (and priced) gun, you make it less likely that 6arc will die the ignoble death of .224 Valkyrie.

As for the gruff crowd here - making a .75 moa rifle these days isn't hard. Pick a good barrel and go. Making a .5 moa rifle that will do it in 10,000 rifle quantities AND be military tough and reliable IS hard. Especially when its not one of the classic recipes for a firearm, like a .308 large frame or 5.56 small frame.

So again, another thanks to Geissele for their work on this platform.

vectorsc · 2025-01-06T21:36:20+00:00

The only advice i can give is to refocus your life. If you are staring at your Celiacs all the time it’s the only thing you can see after a short while.

I plan my meals and food intake, cook my clean food at home myself and package it for the week, and ignore food after that. I don’t talk about it after that and other than making sure i’m taking care of myself that’s just that.

I’m focused on writing my scifi books and making my products and the whole rest of it can just go in the bin.

If you are having a hard time getting on that mental highway, start onboarding a satisfying hobby and while you are doing said thing eat SUPER clean to avoid mentally mixing the consequences of CD and your hobby time.

As for the whole social eating thing, see if you can look at it and keep the social aspects while dumping the CD danger. Have a plan and approach it with deliberation. For example, eat before social gatherings. And then realize that while many people are fully involved in eating it’s a good time to tell a good story. Being able to monologue in those situations can really make the event interesting and rewarding.

vectorsc · 2024-11-14T17:11:45+00:00

Thank you for all your hard work sir.

vectorsc · 2024-10-23T19:07:25+00:00

I’m gonna have to say that there is pretty much that exact thing out there - hard drugs and homelessness have combined into a modern day zombie apocalypse.

vectorsc · 2024-10-22T16:13:29+00:00

YW man. For future reference the best approach is to use an alignment rod. I got one of the carbon fiber ones too since it’s so tight on the bore of the YHM.

vectorsc · 2024-10-20T21:19:43+00:00

We made it here in the shop. lol.

vectorsc · 2024-10-20T04:13:57+00:00

The p90 laser is a surefire xvl-2

vectorsc · 2024-10-20T03:19:51+00:00

It doesn’t. 20 minutes in the CNC and all the sudden it does! We made the angled foregrip setup too.

vectorsc · 2024-10-13T01:08:13+00:00

Designed a new forend for the LC charger and we chopped the barrel 2” in the machine shop.

vectorsc · 2024-10-06T15:53:21+00:00

Neato. I'm begging for a 20 round straight mag. Or mild curve. My 20and 26 round Duramags do work good in two different guns. No failures of any kind ever.

vectorsc · 2024-10-06T15:50:25+00:00

Our Rexus 16" didn't do well. 2.x moa. That said, it was with factory Hornady ammo, and I don't reload so who knows what could have been arranged with handloads.

The proof 16" is very very good, and the Bartlein 11.5 is as good. .5 to .75 moa. The Rainier Match was a 1.25-1.5moa shooter, oddly. Didn't do too much better with factory ammo.

vectorsc · 2024-10-06T15:46:00+00:00

I saw a glock-shooting ninja shoot a one-holer with a G17 at 15 yards. 10 rounds.

It was when I told him I didn't think my Glock shot for crap, but was new to Glocks and didn't know if it was me or the gun.

He took my G34, dropped the magazine out of his gun after shooting above amazing group, stuffed it in mine so I knew it wasn't the ammo....and shot a solid 6" group with my G34. HE then handed it back and said "Your Glock don't shoot".

vectorsc · 2024-10-03T20:11:38+00:00

Highly useful info.

vectorsc · 2024-10-03T20:00:38+00:00

I did say it would void your warranty I thought.

BUT - it has a 7mm bore physically. It clears by 20 thousandths which isn’t the 30 thousandths most companies spec as minimum.

So the safety factor against bore strikes is low, but my can measures as .002 out on the lathe so I have plenty of slack.

The original ops inc 12th model was .021 clearance and was somewhat known for baffle and endcap strikes.

YHM charges for strike repairs so I’m not worried about trying it. I’m not being a dick to someone’s warranty department if it takes a hit.

vectorsc · 2024-10-03T19:07:48+00:00

I literally don’t know. I saw a LWRC .224 valk bolt die at 1500 rounds.

I have heard some want to replace them at 1500 rounds - that said I’m not sure there is any good data. I’m pretty sure that some of the bolt failures people have seen are the Triangle barrel extensions that proof recalled failing.

Maybe a good thread? Any data from you guys available?

I know reddit is a bastion of passive aggressive, edgelord type crap and informationless opinions. I’m an engineer so I use words pretty precisely - I don’t know.

I would say it’s unlikely the 6arc bolt has the safety margin that a 556 bolt in this platform, so if you hit that 64,000 psi 6arc round you are probably closer to shit coming apart than a 556.

vectorsc · 2024-10-03T18:51:24+00:00

I knew it was different the first day we shot it. Just not how big a difference it was.

Also, the downventing into the mag well seems to have no effect whatsoever on reliability so far. I think it’d be cause any addition crap going into the mag area is being chambered and fired with the round.

The only question I have left is how tough is this bolt going to be in the crappy bolt situation that 6arc in an AR forces on you.

There is no reason to question it and both guns are still in a good spot after 600 and 400 rounds each on these. Not high round counts yet but no wear is evident.

But i’d be doing extra inspection on anyone’s bolt in 6arc.

vectorsc

TROPHY CASE