I'd been looking for a 9mm carbine that uses Glock mags, that was not a Keltec, for a while now. Found out about the JRC, and my LGS had one in stock, so I decided to give them a try. The gun is all metal with the exception of the collapsable stock, and feels much like a AR in my hands. Uses AR furniture, and a AR trigger setup. The bolt handle can be moved to either side of the gun, and so can the ejection...and they can be moved from one side to the other, independantly of each other. Unfortunately, the mag release isn't like the bolt. It's on the left side, and there is no changing it to the right. So far, I've put 150 rounds through it, and had a single jam that I'm fairly certain was not the guns fault. When it jammed, it ended up with 2 pieces of fired brass in the ejection area, and fed a fresh round on top of the most recently fired brass. I'm fairly certain one piece of brass fell back into the ejection port after firing another shot, due to the rest I was using (a pile of carpet). This is the only thing I can think of that would have caused that to happen. In the 150 rounds I've put through it, it's never actually shot twice with one trigger pull, but I don't want that to even be a possibility. With the above said, I'm not wild about the ejection of the rifle. The brass almost trickles out of the ejection port. It's tossed maybe a foot out, and down by my feet. This was using Winchester NATO, Geco 124gr, and RWS 124gr ammo. I suspect using cheap WWB might cause some problems, but I rarely use that anyway, so... One somewhat major problem (that should be easily and cheaply fixed) I noticed this morning is that the trigger releases the hammer twice with one trigger pull. I noticed this prior to going to the range with it today (which made me cancel the range trip) while looking the gun over at home today, doing a check. Racked the bolt, pulled the trigger, racked again while holding trigger, and then let off of the trigger...hammer fell again. It won't do it if I quickly let off the trigger, but slowly releasing it, it does. It seems as if everyone that has sent their JRC back to the factory, waited 2+ months to get it back. Too slow for my liking, so I'm going to put in a new disconnector and hammer in and see if that takes care of it. The trigger of the rifle is pretty gritty feeling. It feels like it's near what it's advertised to be (4.5 pounds), but it's not a clean and crisp trigger at all. It has seemed to get slightly better with firing, but still not great. Good enough for it's intended purpose though, and not too much different than my Glocks. Feeding and firing has been perfect. It's worked great with both 33 round mags I have, the 10 round G17 mag that was included, 17 round G17 mags, and 15 round G23 mags. It does NOT like NFML Glock mags though. They're all but impossible to get in the magwell, harder to get them locked in, and takes a winch to get them back out. If I get the above problem fixed, I'll probably just sell off the couple NFML mags I have and buy FML mags. FML mags fit and lock in fine, albeit they have some wobble. The wobble hasn't effected function though, and I've wiggled them every way possible trying to get the gun to malfunction, and it won't. I may have a friend make me a longer (top to bottom) mag well though, so that it gets rid of the wobble. While it doesn't seem to effect function, it drives me mad. One thing I'm not wild about on the JRC, is it uses a metal mag release. Not a big deal if you use metal mags, but I'm a little worried it'll chew up the plastic Glock mags. IF it does, I'll either have to buy mags that are primarily used for the JRC, or see if I can get someone to make me a plastic mag release. Field stripping is kind of dumb as well. To field strip and remove the bolt, you must remove the buffer tube/stock. As much as it seems this rifle tries to be an AR, why didn't they make it more like an AR? The upper reciever is similar to an AR, except the buffer tube is mounted to the upper. Also, rather than using pins to hold it together, it has allen screws that hold it to the lower. The mag well comes off seperately, and the gun is advertised to be multi caliber, being able to easily swap out barrels, mag wells, and bolts. Supposedly the hole swap is $250, but I haven't verified this myself just yet. Calibers offered are 9mm, .40, and .45. I do wonder if it'd be possible to make a 10mm carbine out of it using a .45 mag well and 10mm Glock mags, .40 bolt and barrel, and have the chamber reamed to 10mm length...and use a stiffer buffer spring and/or buffer. Hmm... Overall, despite everything noted above, I actually really like the JRC. It feels well built, uses Glock mags, and parts availability is pretty good since alot of the parts are AR15. The parts that aren't AR, that are likely to get worn, I'll buy some spares from the manufacturer of the gun (mostly the extractor, and probably a spare ejector as well, and a firing pin).