Practicing with Night Vision

[Curly Shuffle]

A good smith that is familiar with ARs can tune the ejector. There are many posts on other forums about taking the sharp edges off here and there so they are not so hard on the brass. I myself would not do it, I would have to take it to someone. The only other thing I could come up with is a gassing problem, sounds like it might be over gassed. But I sure do not know enough about it. I do know that Spikes 308 lower will not work with some DPMS parts in a 308 setting, a friend and I just found that out. But Spikes fixed the problem for the friend and sent him their parts. There does not seem to be a written book about this yet and some of the parts from some gun places seem to be different, they are making what they think is right. The only thing that was told to us is make sure you start out with the same upper and lower, good quality parts and get the barrel and bolt/extractor from the same place, after that it seems like they are good to go. Good luck. BANG BANG!!

 

[FrankT]

There are 2 308 DPMS platforms w different specs, the old and new, no they don't work with each other

 

[Curly Shuffle]

This was with the new. and in the low pro. BANG BANG!!

And after the fact to WigWam the above post was for an AR if your gun is bolt then I sure do not know anything about that other than you could still tune the ejector/extractor it does the same thing.

 

[wigwamitus]

Yup ... the 7.62 is an "MSR" ...

Maybe I should just give up on the idea of having a maintainable 7.62 MSR and get a 6.8 upper and call it good. Now to find a "standard" 6.8 upper !!

 

[Curly Shuffle]

Eric at Black Stone Arms builds a nice upper/rifle. BANG BANG!!!

 

[Chopperdrvr]

The problem you are having is not uncommon to any of the AR style bolts. Sharp edges around the bolt face shave off small slivers of brass which have a way of finding their way into the ejector pin recess causing the problems you have experienced. It's not unique to the .308 models. One of my 6.8's is still doing it after hundreds of rounds. Two theories exist about how to fix it are shoot it enough to wear smoothe the edges or manually break each edge with an abrasive. It sounds like you have shot quite a few rounds through that rifle already, so I would start looking for the sharp edge causing your problem. First place to look would be the hole that the ejector goes in and see if the top edge is sharp. As brass expands under pressure it protrudes into the edge of that hole. If the bolt begins its rotation before the brass has relaxed, it can shave a tiny piece off like a slicer cutting lunch meat. Good luck with it, and check out some of the posts on 6.8 forum dealing with the same issue.

 

[FrankT]

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[wigwamitus]

FrankT,
Wow! That is amazing ... the lower being $100 .. that makes the order price $820 for a .308 AR rifle with 18 inch barrel and monolithic top rail (lo pro gas block) ... virtually my dream gun! If I go for that I will owe you!!! Hecque I owe you for finding it!!!
Joe

I hope I could use DPMS (G1) parts on this rifle for the most part ... the newer rifles being 2 pounds lighter is very interesting ... but I'm used to the 9.3 pound (empty) Sig716 I have, so don't have to have the 2 pounds gone ...

 

[FrankT]

verify that it will take DPMS G1 parts but everyone that gets one likes them, just too heavy for me. Certainly affordable. Good Luck

 

[wigwamitus]

The problem you are having is not uncommon to any of the AR style bolts. Sharp edges around the bolt face shave off small slivers of brass which have a way of finding their way into the ejector pin recess causing the problems you have experienced. It's not unique to the .308 models. One of my 6.8's is still doing it after hundreds of rounds. Two theories exist about how to fix it are shoot it enough to wear smoothe the edges or manually break each edge with an abrasive. It sounds like you have shot quite a few rounds through that rifle already, so I would start looking for the sharp edge causing your problem. First place to look would be the hole that the ejector goes in and see if the top edge is sharp. As brass expands under pressure it protrudes into the edge of that hole. If the bolt begins its rotation before the brass has relaxed, it can shave a tiny piece off like a slicer cutting lunch meat. Good luck with it, and check out some of the posts on 6.8 forum dealing with the same issue.

Right, I fired 1,000 rounds +/- through this rifle over 21 month period before falling off the cliff last November. I figured I would have worn it in by then !!!
If I have to, I can go through the process I've been going through and disassembling, cleaning and reassembling the ejector components every 5-6 weeks ... about every 200 rounds ... I was just worried there might be a larger issue like a crack or crevice in the bolt allowing the shards into the ejector "tunnel" ... but your words indicate perhaps not. That is encouraging. I don't mind the labor too much. Maybe if I clean the ejector area every 2 weeks it won't be so hard to get out. In the three times I've done it ... it has taken 2-3 days of soaking and pulling to get the ejector out AFTER the retaining pin has been removed. I had been led to believe that the ejector would LEAP out and fly across the room after the retaining pin had been removed. But I've never seen that phenomena !!!

Chopper, thanks a bunch for your input!

 

[FrankT]

I am sorry but long ago there would have been new parts, a new bolt first.

 

[wigwamitus]

... just too heavy for me ..

Yeah I agree ... but as many have said before me ... "I can just train for that" !!!

2 pounds lighter would be a dream on top of a dream ... but the G2 DPMS in my hands is probably a year out ... availability ... and none of their current models are "perfect" like the PSA you showed with the full top rail and lo pro GB and no FSP, etc. I wonder how good that BCG is and how much punishment that PSA can take ... but they are highly rated ... from what I've seen ... my 5.56 receiver and BCG are BCM and that stuff seems solid ... I wish they made a 6.8 upper ... I might have snapped it up today if they did ...

Well I've learned enough to know making an "emotional" decision is bad ... so I'm going to noddle on all this data a bit ... in the mean time I'll put the Sig716 back together and test fire it and it will probably be good for a few more weeks before I have to do this again. And I'll have to repeat the "ejector cleaning" process every time before I do anything "important" with it ... but I can do that ... that is better than sending it back where I don't have it for at least a month. I'm definitely not in the "send it back to the mfg" business.

The question for me is "give up on 7.62/.308 as a viable caliber I can support or switch to 6.8 in the hopes that I can support that caliber for 20 years" ... that is the question ...

==
I've posted on several "gun forums" ... and this is the "smallest" ... but without a doubt the most useful for me ... you guys are "the few, the best" ... thanks the most est

 

[wigwamitus]

I am sorry but long ago there would have been new parts, a new bolt first.

Exactly, that's why no matter what, I'm done with this Sig, Savage, Ruger business model of NO PARTS.

 

[wigwamitus]

Everyone is telling me "good luck" ... sounds like the "kiss of death"

 

[FrankT]

Sorry, I forgot it was a no parts sent to you gun, It would have gone back for a replacement

 

[wigwamitus]

In Nov .. I called Sig, in part due to your prompting ... and they said Warranty Repair no problem ... send it back to us ... and I said fine let's do it ... and they said they would send me a "Return Authorization Number" ... but no such number ever arrived ... I received no further communication from Sig until 2 weeks ago when I got one of those customer service "how did you like our service based on your call in ?" emails ... and I replied "It was great except I said I wanted to send in my gun and the person said they would send me the RMA and they never did ... other than that the service has been great". I have heard nothing further. So, that's why I don't like the return the gun to the mfg business model. I want my guns working. And if they are broke I want them fixed in hours or worst case days ... not months ... so the Sig, Savage, Ruger business model doesn't work for me. Their business model is not compliant with my business model which is guns up and running or fixed within hours or worst case fixed within days. They can't deal with my business model ... hence I can't deal with their business model

 

[wigwamitus]

If I had sent the gun back to Sig ... I would've not been able to go hunting with TLM ... I would rather patch/fix the gun myself ... as I did ... and go hunting with TLM ... than send the gun to Sig and sit on my ass and learn nothing ... that's why the guns have to be up and working ... time is my most precious asset ... I think Napy said something like that ... and he was right ... I can vouch for him

 

[FrankT]

Good Grief...phone is the only way to go, pester them so much they give up and give you service.

 

[wigwamitus]

That's fine but I have a day job ... consumes about 80 hours of my time a week ... I love it because I can work from the ranch in the middle of Kansas ... and I don't have to go into the office in the "big CA" any more ... which I would not do ... and it pays the bills ... so ... I don't have the time to chase them to do their jobs ... I have the time to fix the guns to the best of my ability with the parts I can get ... which is what I have done ... or I have the ability to take the guns to nearby places which can either fix them while I stand there or next day (50/50) ... but I don't have time to chase idiots down to do their jobs ... I need to work within my business model ... I cannot adapt to their business model ... hence I'm looking for different guns ... guns that are aligned with my business model. It is either that or quit my job and get a different job ... so I can get aligned with the gun mfgs business model ... I'm going to try the other option first ... adapt guns to my business model ... rather than adapt my life to gun mfgs business model ... ... now you can wish me good luck with that !!!

 

[FrankT]

Good Luck!!