It's Mostly Reliable
I will comment with, 'it is mostly reliable, but did need a trip to Wolverines for some warranty work.'
I had 2 issues, 1 of which was fixed, 1 wasn't. Details follow.
1st issue, is the FTE that ends up looking like a double feed but one of the cartriges is spent so it must be a Fail To Eject.
Attached pic shows what it looks like. Also shows the spent casing and the damage to the jammed round.
I had two of these in 200 rounds.
So, my example of the FX-9 is definitely not the worst.
Wolverine's gunsmith did resolve this issue, but it looks like it was just a break-in period.
I think the buffer spring needs to loosen up a bit.
Also, I think running this firearm pretty wet helps with function.
i.e. less drag on the bolt and buffer when cycling should help things work better
2nd issue, is that there was a small hole in the bolt from the ejector channel into the firing pin pocket.
In the attached pick you can see the tip of a knife inserted into said hole.
This issue isn't causing any real issues.
And the manufacturer says this issue is within spec.
A little disconcerting but I can live with it.
Manufacturer Response:
“The design has a very thin wall (.007”) which can be cut through even when the parts are to spec.
The cut into the firing pin pocket is not a problem and will not cause any problems with the function of the firing pin.
It may require the user to take down and clean the firing pin pocket approximately every 10,000 rounds or so which should be done more often than that with regular maintenance.”
Wolverine's Response:
"Test fired and confirmed that there was some feeding and ejection issues.
It was determined that feeding issues were from the magazines having the feed lips to wide at the front.
This let the round flip up nose high causing the feeding jam.
Ejection issues disappeared after the rifle had a few magazines shot through it.
Our gunsmith can no longer replicate this issue."
Side Note, After they returned the firearm, I used the same magazines as before and they have worked for 200 discharges without issue.
FYI, these were PMAG 17s. (I've also used SGMs)
Both work with last round bolt hold open.
I don't think either brand was contributing to the issues.
Other Note
As I dislike the twangy sound of the included buffer spring I replaced mine with a Strike Industries Flat Wire Carbine Spring.
Since then I've had 1 FTE/double feed in 100 rounds.
I'm hoping it will be 100% reliable again within a couple hundred rounds more.
I truly believe most of the issues can be resolved by working in the buffer spring.
EDIT: I put the original buffer spring back in as it was going to take too much ammo to break in the Strike Industries Flat Wire Carbine Spring.
At least with 9mm, unlike 5.56mm, you're not using up 10% of the barrel's life by breaking-in other parts.
End Note,
I think the FX-9 is a very fun carbine.
As I don't own any ARs having a carbine with AR-like controls is pretty cool and fun to play with.
For mag dumps and quick reloads it is really nice.
But, I'm not yet 100% trusting in it (I'm 99.8% as this point).
If I wanted a 9mm Carbine for: Home Defense, Go To War or $hit Hits the Fan scenarios;
I would stick to my Thureon Defense, which has been solid from day one (but also costs a chunk more)
Maybe over time this will change (and I'm hoping it does) as I'm not yet a FX-9 hater
