I won't say who made the rifle, but the price of the rifle is more than 2000 euros and the quality of the rifles is well known. I bought a brand new rifle and fired about 1,200 rounds from it, always fired with a silencer, an adjustable gas unit, no overgas. The cartridges are commercial, there were no signs of overpressure. I shoot a lot with different AR-15 223 rem and after several thousand shots I have never encountered problems with the bolt of rifles. There is a breakdown on the new AR-10 308, which is not the cheapest, after 1200 shots. The question is: do ar-10 rifles often have bolt failures? Or in my case, just a defective part?
The bolt of the AR-10\308 rifle is broken.
- Thread starter Venäjä77
- Start date
These parts are a dime a dozen.
Don’t worry about it.
If the same thing happens to the replacement part, then you have a problem.
I hope that the broken part will be replaced under warranty.
If the breakdown happens again, what does it mean??? What should I pay attention to????
85.7% as good as yesterday.
I shot 60 rounds, everything worked fine. I found the problem this morning when I was cleaning my rifle.
Contact between the bolt and the barrel extension.
One lug may be doing most of the “locking,” for instance.
1,200 rounds shouldn't break that bolt head, but... I've seen them break with less. I've seen ar15 bolts get 30k rounds, but I saw one break at less than 500rds once. I think it might be a place where spending a couple extra dollars is worth the investment. I've been shooting 6arc since it was announced, and I've read about severall people complaining about broken bolt heads. If you buy JP bolts and bolt heads, they just don't seem to have that kind of trouble. An ar10 is a far more violent cycle, and it's brutal on the bolt head.
That isn’t an AR-10 bolt for starters.
It’s an AR-15 bolt with a .473” cartridge bolt face, with dual ejectors.
This means it can only be a small frame AR-15 chambered in .308, not a large frame AR-10.
POF Rogue has a single ejector, so it isn’t that.
AR-15.......................SFAR...................ArmaLite AR-10
It’s an AR-15 bolt with a .473” cartridge bolt face, with dual ejectors.
This means it can only be a small frame AR-15 chambered in .308, not a large frame AR-10.
POF Rogue has a single ejector, so it isn’t that.
AR-15.......................SFAR...................ArmaLite AR-10
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That isn’t an AR-10 bolt for starters.
It’s an AR-15 bolt with a .473” cartridge bolt face, with dual ejectors.
This means it can only be a Ruger SFAR bolt.
POF Rogue has a single ejector, so it isn’t that.
AR-15.......................SFAR...................ArmaLite AR-10
Yep I have one in the shop, look like the Ruger 308 bolt
One thing I noticed was that POF did a lot of their high-volume testing using Russian steel case .308 Winchester ammunition.
Russian steel-cased .308 was loaded to much lower working pressures, some sites claiming 42,700psi even.
So when POF was validating their pressure containment and durability of the small frame AR-15 chambered in .308, most of the ammunition was not anywhere near SAAMI MAP.
Ruger of course knocked-off the POF Rogue when they made the SFAR, using similar pressure containment approaches with AerMet super alloys for the bolt and barrel extension, while also adding vent holes in the extension and upper receiver in case of a case failure catastrophic malfunction.
So it doesn’t surprise me to see a part failure, especially for a rifle priced in the $1k region.
I would also look at the receiver face and see if it is square. Being out of square causes asymmetric loading on the bolt lugs, and the lugs adjacent to the extractor pocket are the weakest.
You can use the Wheeler receiver face lapping tool to check if your receiver face is square.
Russian steel-cased .308 was loaded to much lower working pressures, some sites claiming 42,700psi even.
So when POF was validating their pressure containment and durability of the small frame AR-15 chambered in .308, most of the ammunition was not anywhere near SAAMI MAP.
Ruger of course knocked-off the POF Rogue when they made the SFAR, using similar pressure containment approaches with AerMet super alloys for the bolt and barrel extension, while also adding vent holes in the extension and upper receiver in case of a case failure catastrophic malfunction.
So it doesn’t surprise me to see a part failure, especially for a rifle priced in the $1k region.
I would also look at the receiver face and see if it is square. Being out of square causes asymmetric loading on the bolt lugs, and the lugs adjacent to the extractor pocket are the weakest.
You can use the Wheeler receiver face lapping tool to check if your receiver face is square.
That's not how engineering works in a relatively large liability conscious organization. Ruger's bolt isn't a direct copy of the POF, even if it was there's 0% chance that they just copied the POF bolt, picked a similar material and did no validation of the strength, fatigue life, or just ran a bunch of steel cased wolf or whatever. I run an engineering group, and this just isn't how things work, nothing gets released like that.
What's far more likely, if this is an SFAR bolt failure, is that there was some material defect, or defect in lock up geometry that caused a stress concentration that lead to premature lug failure.
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I guess if you dont have a basis of comparison its hard to know if it was 100% running correct. Could appear to run fine but could be cycling a bit violently. Overgassed or weak buffer. Was ejection pattern right on? Any extraction/ejection issues?
Did the extractor pin break and the extractor get slammed in there and that could have caused the bolt to break? Did you take the extractor off? If so was it sloppy? Forward and back play? Need better pics of bolt, extractor, inside the chamber, barrel extension. My guess is the bolt broken is secondary damage from something else that happened. Need to figure out exactly what happened.
I never suggested Ruger did anything remotely like that. For a larger brand like Ruger, they should have done pyramid testing with “their own design”. Of course they didn’t knock-off the Rogue spec for spec.
But POF pioneered the AR-15 frame size chambered in .308 Winchester, where the bulk of the difference is in the location of the FCG due to magazine well displacement, along with the super alloys for pressure containment in the extension and bolt.
Defective parts. Particularly with that specific part it has to go through a very specific heat treatment to keep it correct.
Most manufacturers will essentially outsource this function as it is very specific in nature and typically requires some type of specialist to consistently do it right.
I don't know the manufacturer but I'm sure they will replace the parts. One of their 3rd party subcontractors dropped the ball on this one.
Feel bad for him if ruger SFAR really is 2000Euro over there since they're 999USD here.
Common practice among the US-European distribution and retail scheme is for the retail customer to pay 2x what it is in the US.
Brownell’s and other distributors do the same thing.
have several similar rifles at home with a similar barrel and they all work perfectly. Ejection of the cartridge case for 1-2 hours, adjustable throttle, I always shoot with a silencer, no problems with reloading cartridges, extraction of cartridges is also excellent. There was a breakdown of the extractor , about 100 shots before the bolt broke . But the rifle, as always, was cleaned after firing and everything was in perfect order with the bolt. Maybe you're right
In the photo, the rifle is not cleaned - the store asked to bring them a rifle in this form. We agreed to a free replacement of the shutter assembly.Attachments
Manufacturer is irrelevant. Anyone can have a bad part get passed quality control. Contact them and send them pictures. What sucks is that they are likely going to want the whole rifle back for inspection.Don't torture me
It doesn't look like an SFAR bolt to me. The spacing is wrong.
I'll caveat emptor what I'm about to say with this.
Ejection pattern isn't really a reliable way to assess if it's gassed correctly. Especially when you have dual ejectors or a platform other that Colt pattern AR's.
Having said the above 1-2 o'clock ejection is typically over-gassed on a std AR. Both AR15 & Large frames I own are ejecting at 3-4 o'clock once tuned.
Doubtful that's the cause, but it may have helped expose the defective part sooner.
A better way to tune gas is by lock back on last round. Firing 1 round at a time from the mag, note ejection pattern when it's not locking back. Say it's 4:30 and at 4:00 it now locks back. Add a couple clicks of gas after min to lock back. again note the ejection pattern. Wherever that pattern is, it's correct for your gun.
Overgassing does cause accelerated wear. That is also the best way to tune your gas, assuming that your gas adjustments are fine enough. What sucks is when one setting isn't enough gas and the next is way over gassed.
Where did you buy the rifle from?have several similar rifles at home with a similar barrel and they all work perfectly. Ejection of the cartridge case for 1-2 hours, adjustable throttle, I always shoot with a silencer, no problems with reloading cartridges, extraction of cartridges is also excellent. There was a breakdown of the extractor , about 100 shots before the bolt broke . But the rifle, as always, was cleaned after firing and everything was in perfect order with the bolt. Maybe you're right
Our summers are short and winters are long - the latitude of Finland is much north of your Anchorage, which is not very Miami. Therefore, there is not always much time to browse through the forum.
Yes, the rifle was made in Europe and its quality and, as it turned out, the support after the sale, all this is excellent. The bolt of the rifle will be replaced for free in a week.
The reason for the breakdown is as Green461 correctly said. I change the detail and continue to enjoy shooting
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The bolt carrier of my AR-10 rifle is larger than the AR-15, I don't know why you decided that. There are two m110 ejectors and there are still enough examples - there are no problems.
You're going to find that by withholding some details, and slowly doling out other details, the members here will be reluctant to help you the next time you have a problem. By concealing the manufacturer, you asking for help while refusing to help anyone else at the same time.
There is no secret
, I didn't think it was important who the manufacturer was.Green 461 correctly explained the cause of the breakdown and he didn't care who the manufacturer was. I think his practical experience helped him, thank him so much for that!!!!!!
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The rifle was made in Russia, imported to the point of universal madness because of the Nazis with the yellow-blue flag and the stupid decision of the queer government of my country to join NATO. It's called the Kurbatov Arms.
What's the secret?
What's the secret?
How are you/they able to import the bolt with the current sanctions etc. in place?
Oh, this topic will definitely not be mentioned here
, everything is bought and everything is sold - Capital by K. Marx.It takes only two weeks for delivery from Russia to Finland, previously it took one evening
. Fins and germans go on vacation to the russians in Kaliningrad and don't ask why 
Buddy, you're 100% right. I have an old friend who lives in St. Petersburg and he laughs out loud at us Finns - when we traded with the Russians, everything was fine between us and them. And now the Russians are in full order, a friend bought a new BMW X7 last year and recently an Accuracy International AXMC with a pair of barrels.
My business is like the Titanic
