This is certainly NOT definitive as I do not have an Octane45, but as expected the thread pitch on the octane9 and obsidian45 are the same. Not knowing what a octane45 baffle stack or endcap measure out at, I will offer that the obsidian45 9mm endcap is ~.47" inches with no shoulder to stop it from threading in to engage the baffle stack.
I will also mention that my 9mm endcap is unused, and I almost exclusively use my obsidian45 in 'K' config, mostly on my reverse stretch, and now omega Gideon. It's one less thing to swap out.
Last edited by kbinmt; 02-08-2018 at 12:20 AM.
I thought SilencerCo said the 9mm endcaps on Octane 45s were bad juju, and they’d seen endcap strikes, probably from folks who forgot to tighten the can down periodically. That’s why I thought they kinda vanished from the market. Either way, the 1 to 1.5 dBm difference really isn’t worth the squeeze.
When I put a 9mm end cap on my Obsidian 45 change pistons and shoot it on a Sig MK25 or a M&P Core pro I got frequent end cap strikes with the 9mm cap on. I have factory or Jarvis threaded barrels and always use VibraTite VC-3 on my threads, gently small strap wrench snug it and check it frequently. Have no idea what happens but it sounds like gje same thing happens with the Octane. Really not worth the expense and subsequent damage for that little dB improvement. Got a Kraken 9, Obsidian9 M, and a TiRant 9M for my 9's now. Dedicated cans are almost always quieter than 45 cans on a 9. You would think the extra volume in the bigger cans would help but it can't overcome the suppressor center channel size. The only exception to this I have ever personally witnessed was when SilencerCo was at our range and the rep said and I heard with my own ears that the Osprey 45 full size suppressor is quieter on a 9mm Sig P226 than the dedicated Osprey 9 and it was a noticable difference so it had to be at least 3 dB or so.
George from Alaska
HK45T DA/SA, HK45T Light LEM, Mark 23 90's era, no lockout, P30L v3, another on it's way, P30L Light LEM, USP .45 Elite
rrMP5 SEF select fire - Flemming from a 94
IGF MP5 SBR
IGF HK33 pistol
RDTS MP5 pistol from a German HK parts kit
RDTS MP5 SD pistol from a German HK parts kit
TSC MP5K N pistol from a German SP89
bunch of suppressors
other NFA machine guns