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grottulf

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Finally read the FAQs

Finally read the FAQs (3/11)

  1. Now I've shot a few hundred rounds at a competition this weekend, and I never had any slamfire. So I'd say my problem was due to my trigger modifications.
  2. Oil is a dirt magnet. I'd try less oil instead.
  3. I don't think they are any different from other AR-9's in that regard, so the same parts that works in others, works fine in a FM9 as well. I have a Kynshot (same as Blitzkrieg) RB 5015HD buffer in mine, and a 3G sports 6" comp (similar to the Brekke comp extension) Each of them made a significant improvement. But I would like to get it to shoot even flatter, so I'm thinking of porting the barrel, and I'm also a little curious about a magnetic buffer... I should add that I'm only shooting standard pistol ammo in mine. With handloading I could probably get it to shoot much flatter as it is.
  4. I should add that I have never had a single failure to feed with mine. I've only shot FMJ with it, and about 600 rounds so far though. I have however some problems with failure to fire, but I traced the cause of that to a too long headspace. And they will ship a new bolt to me, when Brownells finally gets their thumbs out of their ass...
  5. My problem was probably self inflicted... I had limited the over travel on the stock trigger. After I restored it to factory condition, I haven't had any issues. I haven't shot it enough after that, to say for sure though. But I'll get back to you if it starts again.
  6. Is the length of the buffer adjustable? So you can make sure it locks when the bolt is fully closed? Because I assume that there can be differences in how the threads for the buffer tube is cut in the upper (where it starts), and that would change where it locks.
  7. Yes, I'm having issues with intermittent 2-3 round bursts with my FM9. I just assumed it was trigger related, and since I'm planning on swapping out the stock trigger, I didn't look into it more thoroughly... Is there a way to tell if it's because of a week firing pin spring, or if it's trigger related?
  8. I have the same issue with some of my glock mags in my FM9. Did you sand the mags or the magwell?
  9. Crystal clear! Thanks for the clarifications, guys! It's strange that FM made the ledge so small. It's only about 1mm (0.04") on my bolt. The angled part could be much smaller and still clear the radius of the charging handle. And I suspect the tolerances between the upper and the bolt are a bit loose, because the charging handle slips of the ledge and pulls on the angled section instead, when the guns not loaded. I hope that has been fixed in their revised bolt, that they have promised to send me. I just have to wait until Brownells starts to export gun parts again, before they can ship it to me.
  10. How come some bolts have this ramp in the front part of the gas key dummy (not sure if that's the correct term for it, but dummy felt right...) My Foxtrot Mike bolt has a ramp like that, and when I pull the charging handle it pushes the bolt down slightly because of it. So if I pull the charging handle while there is no mag inserted, the bolt will drag slightly because of it. But when there's a mag with bullets inserted, it will push up on the bolt and counteract this. So it really isn't a big deal, it's just slightly annoying. I'm just curious why they would design it like that? It's not just FM. CMMG and even JP has bolts with this design. Some seems to have a design without the ramp, like the one in the pic from Angstad arms, and Taccom. That seems like a better design to me. But for some reason they then place it further back on the bolt... Is there a shorter charging handle you can use for these? Or should you just accept that there is some slack in the charging handle before the bolt starts moving...? Am I missing something?
  11. That's not a bad idea I've fixed it now though. I made a new shim from 0.001 stainless steel stock. First I test torqued it with oil and I got it to around 100 ft lbs. I deemed that to be enough as long as I add permanent threadlocker. When I applied a threadlocker, I applied it not only to the threads, but to both sides of the shim as well, for lubrication. (I noticed that shims this thin breaks easily otherwise, at least if they're home made ) But then I couldn't rotate it enough to get it to align... I hadn't considered that the threadlocker takes up some space as well. So I ended up removing the shim (and cleaned the threads thoroughly) And re-tightened it without the shim, and just thread locker, on both threads and the mating surface. It was enough to get just under 100 ft lbs. I think (hope) that will work fine. I'll never remove a comp without a barrel vise again anyway...
  12. I've gotten my hands on a sheet of stainless .001" stock now, so I'll cut out a new shim. I'll just have to find the time for it...
  13. Sorry, I totally forgot about this thread. I had a lot of stovepipes issues with it at first. But after I adjusted the ejector with a home made shim, it has worked perfectly. There was some other minor issues as well. I've emailed the factory with feedback and they have been very responsive, so I'm pretty confident they will have fixed all potential issues before they start to sell them in the US. All in all, I really love the shotgun. I mostly shot 28g shots due to the minimum power factor in IPSC, but it works fine with 24g as well. Not sure what that is in oz, you do the math. The recoil is really soft. I think it has a lot to do with the rotating bolt design. It's the first AR I've had that I don't feel the need to change anything about. I really like the pistol grip and the stock. And I love the handguard. The comp works great, and you can change chokes without loosening the comp. You don't have to loosen the comp when you remove the handguard to service the gas system either. I also love the low weight and the balance of it. But in all fairness, I haven't shot a Derya MK-12(RIA VR80) or Typhoon F-12, so I can't say how it is compared to them.
  14. In IPSC you can choose to have open action at unloaded starts.
  15. Great! Thanks for sharing!
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