Direct from Andrew, since I was helping do pre-production T&R for them before the public release. They sent them Form 3 to my local SOT (range). Then we used SS for the paperwork and eForm submission, since my local dealer is a Powered By dealer with the kiosk.
www.capitolarmory.com I haven’t… I don’t own any K-cans, as I much prefer volume over length. But that’s a personal preference. IMO, the Polonium is already so short, even with a KeyMo mount, that the full-length version is the size of most K-cans, but suppresses like a true S-can. It’s extremely impressive for its size, I recommend just giving the full-size Polo a go. With the KeyMo, it’s the same size as a Sandman-S, but noticeably quieter. About the same weight, too.
You are correct, 5.56 is kind of a bitch to suppress, but these are pretty good cans. Everyone who has heart it and shot it has talked about getting one. Yes, these are full-auto duty-rated 5.56 cans. Yes, they're solid heat-treated 17-4 stainless steel, they will hold up to massive amounts of abuse, even on short barrels. Why are they so much better? They're quieter than the Sandman-S, but can handle the same basic abuse. Price is only $550 MSRP. Specs can be found on their website.
ottercreeklabs.com 
pewscience.com At the ear, but it suffers at the muzzle, just like most flow-through style cans.Looks to me like the HX-QD 556 is the quietest
Oh, and the Polonium cans have a 6mm bore, so you can shoot 6mm ARC, .243 Win, 6mm BR, 6mm Dasher, 6mm Creedmoor, etc... through them. It was tested and tuned (internal volume & baffle design) to properly suppress 6mm ARC, as well as 5.56. Not sure if it's public knowledge, but this was info that Andrew told me directly in texts.
You might want to watch your accusations.
I haven’t tried it on my 6mm ARC yet (don’t have a bolt .22 caliber anymore), but once it comes back from Christensen Arms, I will. I’ve seen videos of it on .223, .22 Creed, 6mm Creed, .243 Win, and 6 ARC, and it’s really quiet for it’s size, and has a great deep tone, since it’s full 17-4pH stainless steel.
from silencershop?
Yeah I just ordered one finally. I don't really need any more .30cal but I will be happy to have another 556/6mm can.
This thread isn’t dead, just hibernating…
Gotcha.
B&T cans have proven to not be very quiet. I’d wait and get the OCL can. Plus, the OCL can will be HUB threads. I’m sure the B&T will be mount specific.
30 cal would be ideal and happy to wait for the inconel.I ll take the perfect hit when it gets moved to the 556. Not like I am ditching ear pro anyway.
Not opposed to it but if I remember correctly from years and years ago inconel has better heat resistant properties than stainless. Now does it matter with my firing schedule, probably not after all stainless barrels last pretty well. but if I can get the more heat resistant material why not.
You are WAAAAAY behind the times bro. Heat treated 17-4 is solid. The owner of OCL ( @AndrewKing ) tested durability on many competitor’s cans, and his own designs with a 4.75” M4 in full-auto with a D60 drum mag on it. The Polonium didn’t even get phased.
I am sure it is solid . No argument there. Also great materials can’t always defeat a poor design. However, from this thread alone I heard OCL was planning on an inconel can. So I would be curious as to their rationale
They are excellent cans. Very well built, and sound great. They do an amazing job of taming-down the loud 5.56 cartridge.
If you want a REALLY nice precision rifle & hunting can that will put down better numbers than the Ultra 7 G2...And sound amazing, look into the Hydrogen-S 7.62. If you want max suppression and don't mind a 9" can, the Hydrogen-L 7.62 is a badass, and holds its own right up there with the TBAC Magnus, and DA Nomad-LT.
