Not sure what I've gotten myself into. Brand new, $1461.00 shipped to my FFL.

I've got a TiRant 45 on the way, so if I like the Vector, it'll get the F1 treatment.

Question: are the G21 mags + extension very sturdy feeling? I just have a hard time seeing how they could be very strong.


ETA: also, what am I looking at to get the TiRant 45 on there. I ordered it with the .578x28 booster for my 1911.


UPDATE-
I asked AAC about mounting the TiRant 45 on a Kriss. Here is part of what they said-

"Kriss has used a thick profile behind the threads and it causes the piston to not be able to seat onto the barrel without machining that profile of the barrel back a little bit from the threads."

Has anyone run into that before? I don't have the Kriss of the TiRant in my hands yet, but I hadn't heard of anyone ever having that problem.

The extensions are very sturdy and lock up tight. I was impressed at the fit as I was also concerned.

I believe you'll need the other piston booster thread pitch.

Right, but is that it? Nothing different, even though the Kriss is a fixed barrel vs the typical tilting barrels usually used on pistol suppressors?

You need the fixed barrel spacer as well as the 16x1LH (HK USP piston) metric piston.

Thanks, that's what I was thinking, but didn't know what to call the part or what exactly it would be.

So these?

http://www.silencershop.com/shop/aac-fixed-barrel-spacer/


http://www.silencershop.com/shop/aac-ti-rant-45-piston/

Correct. Make sure it's 16x1 LH and not RH. The right hand is only for the Mark 23.

Update regarding mounting TiRant on Kriss in OP.

Can't speak for AAC, but when I had my Kriss, my Osprey 45 seated fine on the barrel.

More emails.  

Interesting.......none of these people are having issues with machining the barrel.......

I'm not a fan of AAC anyway, but it is what it is........

https://www.youtube.com/results?search_query=kriss+vector+osprey

That's what is so weird about it. I haven't heard of anyone having trouble with their threads.

I have the vector and tirant and upon inspection it does appear that the piston bottoms out on the lip of the barrel behind the threads, rather than on the barrel crown.  Not sure it it would matter, but it definitely feels like there are two few turns when threading it on.  Trying to decide whether to risk it, or have the barrel turned down for another half inch or so.

Anyone else have any experience with this issue?

I just purchased the Osprey for my Kriss, glad I did!

There is no problem with using the TiRANT on the Kriss but I know exact what AAC is talking about.  When using the TiRANT on a normal pistol the barrel's outside diameter is a little smaller then the Kriss and therefore the booster threads on about 8 to 10 full turns before it bottoms out.  There are about 1/2" of threads on the Kriss barrel which has a pretty high shoulder.  The booster threads start about 1/8" from the end so you only get about 3/8" worth of thread contact or about 4 to 5 full turns before the booster bottoms out.  My other suppressors have their booster threads come all the way to the end of the booster.  I would say it is more a flaw in -AAC's booster design then the Kriss.  That being said I have run about 1,000 rounds through my Kriss - TiRANT combination so far without any problems (no baffle strikes) and the suppressor has never loosened on it's own.