Do you need a certain wt caliber?
I see they make a adjustable bolt carrier group?
Then i read about an H2 buffer wt?
AI said this Sonicore Rekkr DT .223/5.56 Suppressor, 1/2"x28 will not fit my IWI US Zion-15 5.56x45 Nato AR-15, 16" Barrel, 30+1rd, B5 Stock, Black
Any help?
I highly recommend the Bootleg bcg. Foxtrot Mike was making a carrier with a valve where you installed the bolt but seems to have discontinued that. Existing buffer has been fine in my experience with these adjustable bcg’s, though you may want to go h3 if running a real short barrel especially if running binary or frt. I may have an H3 on my 11.5", can’t recall.
I use direct thread, all my 5.56 AR’s are 1/2-28.
Edit, I removed my adjustable gas blocks after getting the adjustable bcg’s. Much more convenient for me, going from suppressed to unsuppressed and occasionally swapping over to a usually unsuppressed gun.
My quick look, IWI doesn’t list the barrel threading for the flash hider? 
.
One would assume it would be 1/2x28 because that’s pretty much standard for a 5.56 barrel.
As for the advice on the gas and buffer, a can increases back pressure and can be considerably harder on the internals of the gun, so AI probably picked up on someone suggesting an upgrade and adjustable gas block.
Again just a quick look. It’s probably worth you doing a deep dive.
Deep dive already done…in the dark…on my cellphone 
Closest thing I see at the muzzle end is “Flash hider”…69 freaking pages and I can’t find what we’re looking for..
It WAS nice out before I saw this thread 
. Now I can’t even see the stinkbugs, mosquitos or lantern flies.
From AI…
The IWI Zion-15 barrel is factory-threaded with a standard 1/2″x28 right-hand thread pitch for 5.56x45mm / .223 Remington models.
Muzzle Device Replacement Specs
• Thread Pitch: 1/2″x28 (common for 5.56/223 AR platforms)
• Factory Muzzle Device: Typically comes with an A2 birdcage flash hider or similar device secured from the factory.
• Removal Note: Factory muzzle devices are sometimes installed using a thread locker such as Rocksett. Soaking the muzzle end in very hot or boiling water for 15 to 20 minutes can help break down Rocksett before applying wrench torque.
• Tools Needed: A 3/4-inch wrench or adjustable armorers/open-end wrench to remove or install the muzzle
device.
End AI…beep boop.
Inside now…let there be light!! 
And it was good!
I was gonna mention that the threading on my IWI Tavor SAR is 1/2x28, so it should be the same on the Zion….
But I’m at work,… driving….. so my ability to research and post good information quickly is relatively limited
Hmmm, might need to rethink those priorities 
.
Retired here, since the day FJB took office, and always willing to help… when I’m not squashing stinkbugs and lantern flies, that is.
15 years to go at least.
I’m a youngin! Not even half a century just yet!
If / when you get your can mounted, I recommend looking for .223 68 grain or heavier so you don’t exceed the fps for the supersonic “crack”. Preferably ammo that stays around the <1150 fps. Shoot and see how the rifle performs as you may experience cycling issues. Then you can determine how to rectify with an adjustable BCG, heavier buffer & spring, etc. Buying stuff now before you shoot it, in my opinion is a waste of time and money.
My 2 cents.
Good luck!
You beat me by a few years. Retired 1/1/24. I wish early retirement upon everyone that I like. Well-done Matt. 
All my friends (well, that makes 2 people 
) are 49. Thinking I must be immature for my age to be hanging out with such youngun’s.
My closest friends are in their early-mid-40s. We all like good Scotch and cigars, and all politically Conservative, but our upbringing is quite diverse. A Yankee, a Southerner, and a Russian. I will let you guys figure out which one I am, if you don’t already know.
VA iirc?
Yeah, live in VA, but a Yankee by birth.
WV now, 60 years in CT. and a few all over the place.
Thinking the Yankees have been displaced, as New England sure ain’t what it was.
Don’t text and drive! Safety first! 
I drive a yard spotter semi, I just move trailers around the lot.
Some times it’s slammed, move after move,… other times I will sit with nothing to do for extended stretches…(20-30 minutes)
Paid by the hour, but I prefer to stay busy because it makes the night go by faster!
