9mm barrel threading - what pitch?

[Amish_Bill]

I'm getting ready to pick up a 9mm can.

It will share time between a 9mm AR and a collection of common pistols. (likely a 226, maybe a glock or p99, ??)

The question has come up - what thread pitch do I want? 1/2x28 sounds common, nobody else seems to use the odd RRA 1/2x36. Any benefit to left handed? Metric?

I have no factory threaded barrels (the RRA will be cut down) so I'm up in the air on this.

So far I'm leaning towards 1/2x28 just because it's common.

Any opinions?

Suggestions on who to get threaded barrels from?
Who not to get them from?

 

[Rem700SD]

Whatever suppressor you pick up should be threaded, if it isn't equiped with a quick detach device. I'd get all of your bbls to match the can in question, or use an adapter for the oddball that's already threaded. The reason is that any competant machinist can thread your bbls, But it takes an FFL with an SOT to modify your suppressors, unless you are willing to sit there until he's finished.

 

[Amish_Bill]

I can order the can with most any common pitch threading I like, so that's not a big deal.

This leads back to my question - which pitch to choose and why?

 

[Rem700SD]

Knowing very little of actual machining, I'd ask what the most common 9mm can thread is, and go with that. As I stated, it's easier to get the gun modified than the can after the form 4 transfer.
I personally don't change out my suppressors as 3 of them are rifle dedicated(1 .223, and 2 .308). Having a 9mm give you more leeway, however. For your purposes, what thread won't matter as long as they all match. I have a can that is reverse threaded, but I still have to check every few clips that it hasn't loosened up. Very few 9mm that I'm aware of come threaded, barring smg's. If you do plan on getting an Uzi or M-11 in the future, be aware that dedicated cans for those cans are much larger to handle a larger volume of fire. Be very careful with the rate of fire in your AR while using a pistol can on the end. Also ask the company if using their can on your AR is advisable at all.
Hope this helps,
Dan

 

[444]

I don't know any advantage of one thread over another. Just make all of them the same. Keep in mind that when you go from the Sig 226 to the Glock you are going to need an LID.
I would just decide what suppressor I was going to buy. Then I would talk to the manufacturer about threading: what they recommend. Why guess ? They may know of some reason to go with one particular thread or they might make the suppressors and LIDs only in one particular thread.
If I was trying to do with you are doing, I would look at something like the Gemtech Trinity that is designed to be switched around like that.
I have a dedicated 9mm suppressed upper from LRM and a seperate AAC Evolution 9 handgun suppressor (which I use 99% of the time on one Glock). I am not a big advocate of taking suppressors on and off or switching them from one gun to another. Since I only use the suppressor with Glocks and the Browning Hi-Powers, there is no reason to have a removable LID.

 

[Amish_Bill]

I'm getting an Evolution 9. They will make it in 1/2x28, 13x1 left, and metric, as I desire.

I own no factory threaded 9mm to worry about matching. (except the 1/2x36 RRA 9mm I have coming, but those threads are being cut off when it goes SBR)