I've been round and round about this and I need to stuff 4.875" of Cups or RSC's or something to best suppress a 9mm AR.  It will primarily live on the 9mm AR but I might move it over to a 300blk every now and then.  The tube is from a DM ASR kit and it came with the real crappy "Top hat Style" baffles they included.  Those sucked and I didn't drill them.  Wanting to put the best I can in there.  I can get about 8(assuming 1/2" skirt on a 60 cone) or so in there but I'm not sure what is the best to use.  

I keep seeing people say K styles because of the low velocity and I've reviewed over at Form 1 boards but can't really get a straight answer.  

I will be buying these.

Dang, lots of views and no opinions?

You're lacking a lot of info. While some of us have been making silencers for quite a while, not everyone is up to snuff on solvent trap parts. I don't know what a DM ASR kit is or a top hat baffle is. Where are you getting your 4.875 number from? Is this your tube length? What is your tube length? What is your tube OD, ID, what's the baffle profile?  Also, I must divide 1/2" into 4.875 differently than you (I get 9 and change). You say 9mm, but pistol, PCC? Are you running a booster? So much information that would otherwise help us...help you.

Forgive my ignorance.  The kit I purchased is here: https://diversifiedmachine.us/product/sico-asr-advantage-kit/  

The DM Cones look like this:


There is a built in blast chamber in this tube so if I measure from the end of that to the threads I get 4.875".  I  was assuming a half inch skirt on a cone/baffle/etc but some are 3/4 of an inch so I know that can very which is why i said 8'ish.

No booster here as it will live on my PCC AR-9.  The tube OD is 1.5" and the ID is 1.375" and the overall tube length is 6.75".  

I'm not sure what you mean by baffle profile unless that's the question I'm asking...What baffles should I use in a 9mm can?

Again, forgive my ignorance on this just trying to figure out which is the best baffle to use for a 9mm suppressor as this is my first form 1 suppressor.

60° cones with a double radiused clip has consistently performed best with subsonic stuff according to my 2209 and my ears.

If you have 4.875" to work with, I'd get 9 or 10 of them in there, and use a piece of flat stock to align the clips.

662 summed it up, nicely.
I'd add that you'll have a huge blast chamber, for 9mm, and might get a good amount of FRP (First Round Pop). If you weren't planning to run a brake or flash hider w/ QD mount, I'd consider it. It'll take-up some BC volume and help mix the gases when they enter the BC environment. Other ways to mitigate, but they start to get more complex.

One more thought is you could put this tube to the side and use it for a future rifle suppressor. Get a tube w/o a premade blast spacer, so you can fit more baffles and get them closer to the muzzle.

Just some food for thought.

Thank you.



I was planning on using a flash hider and the ASR QD mount.  The first baffle would be very close to the Flash Hider from my simple calculations.


I need to do a good bit more reading it seems.

If you are building an all titanium 9mm can you wouldn’t want to use K’s IF you wanted to also use the suppressor on higher pressure centerfire rounds. Ks don’t handle forward thrust well without beefing them up.  60 degree cones or radials work well from 9mm subs to supersonic centerfire.

Those top hat cones can have that leading face feature trimmed off with a lathe leaving something like an RSC cone.  A collet might be sufficient to hold, but more likely you’d need to have a machinist make a mandrel and fasten with a pilot bolt.

You can probably sell those cones since internals are scarce right now.

I was looking at them last night and thought something similar.  

Thanks for the response.

Why not put some feelers out and see if you can sell the kit, complete?
Just start fresh, with a new tube and proper baffles/cups.

I'm leaning more toward that now...

What are your thoughts on components for a good 9mm can?  Overall length, what type of baffles?  Again it will primarily live on this PCC shooting 147grain.