Does an HK416 count?
I’ve run an FS2000 in a Pat Rogers carbine class and a Austrian Steyr AUGa2 in Pat Rogers, Larry Vickers, Spartan Tactical classes
As I wrote in another thread, when I ran the AUG and the FS2000 in a class, I had already been shooting the AR for over 20 years and had been to several carbine classes with that platform.
I imagine it would be a huge pain in the ass for the instructor to have a new shooter with a non-AR gun who has not fired it enough.
I also had thousands of rounds through the AUG and the FS2000 before I took either of these to a class.
If you go to a carbine class with a lesser known gun, don’t expect the instructor to know much about it, or to sideline the class to give you personalized attention. You need to figure these out on your own.
When I ran the FS2000 through a carbine class, the gun was relatively in the US market for less than a year and there was no information about it with regards to running the gun. There still isn’t.
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You need to remove the captive spring around the firing pin if you want to run any milsurp ammo.
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Since the FS2000 does not have drop-free mags, it is very important to push-pull whenever you seat a magazine in the gun. I have found that sometimes it may feel as though the mag is seated when it really isn’t locked in. So you have to give it a good tug.
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The biggest functional problem I found with the gun is if not handled correctly the FS2000 has been known to produce doublefeeds. This usually happens when a mag is inserted when the bolt is locked back. Sometimes a bump or a jolt to the gun will result in the bolt jumping free and trying to slam shut. But because the the bolt often does not get a good release or encounters additional drag, the bolt does not close all the way and it doesn’t fully chamber a round. If you try to resolve the situation by pulling the charging handle back and chambering another round, you will wind up getting a doublefeed with two rounds trying to enter the chamber.
The workaround for this is to not insert loaded magazines when the bolt is open. Since the FS2000 does not employ a bolt hold open, this is not an issue when reloading after firing the last round of a mag has been fired. It is more of a range issue when you leave the gun with the bolt locked back for a ceasefire and then insert a magazine when it is time to fire again. I figured this out on my own before I ran took the gun to a class. It was very confusing and irritating until I finally figured out what was going on.
In Pat’s class I had two malfunctions. Once because I rode the bolt forward and it did not go all the way forward because of the drag of my hand on the charging handle. When I racked the charging handle to clear it, I gave myself a doublefeed.
I had another situation in Pat’s class where for whatever reason a case did not eject and got caught on the bolt face so that when the action tried to feed another round I got a doublefeed. This required me to pop the gun apart to clear. If it happened with an AR you would have had to peal the case off the boltface. I believe it was with XM193 ammo.
With the AUG, there are two problems that are often encountered. First, some people have been known to put the gas plug on the wrong setting after reassembling the gun. It doesn’t have clear marks but confusing symbols so you have to make sure you reassemble it correctly and have it on the right gas setting. Don’t have it on the grenade setting otherwise it will be a single shot.
The other factor is to be sure not to slam the bottom of the magazines when you seat them in the gun–especially during bolt-back reloads. A standard push-pull works best. If you slap the bottom you can dislodge a round into the chamber. Then when you release the bolt it will feed another round into the chamber, giving you a doublefeed.
Anyway, things have a way of cropping up in classes even if you have fired a bunch of rounds through the gun. When I took the first class with the AUG I had some issues. After that it ran pretty well.
I try to testfire every new-to-me magaine that I intend to use in a class. Somehow, I managed to mix an untested mag in with the rest and I had a feeding issue within the first magazine that I ran in Larry’s class. He certainly didn’t let me forget it.