7/16x28 thread adapter for OG suppressors

[MThuntr]

I have a 280AI Kimber that shoots great but has a radial brake that doesn't get much these days. I'm thinking an OG30 would be the ticket. Problem is Kimbers have 7/16 threads. Unknown doesn't make one.

Anyone make a 7/16 to 5/8 adapter that fits inside an OTB suppressor or do I just knock like 1/8" off each of the corners from the Kimber brand one I have?

 

[HuntHarder]

I'd file down your current one and Roksett it on your barrel. If it comes off in the can, it is a PITA. Maybe you could grind a slot in the part that mates against the shoulder, so you could unscrew it out of the can, should it get stuck.

 

[MThuntr]

I'd file down your current one and Roksett it on your barrel. If it comes off in the can, it is a PITA. Maybe you could grind a slot in the part that mates against the shoulder, so you could unscrew it out of the can, should it get stuck.

Getting stuck is a big fear. I think I'll have to see if there's a design I can copy somewhere online

This suppressor would likely get moved between a couple rifles so I may use a very small dab of high temp anti seize.

 

[HuntHarder]

Yeah, it's a problem with OTB that doesn't exist with traditional. If you plan to move the can around, I would defenitly plan for the worst and have a way to remove the adapter, should it get stuck in the can. Notching the adapter and making a price of metal to act as a "key/ screwdriver" to remove it seems like the easiest I could think of.

 

[nm.otter]

N

Post in thread 'Unknown suppressors OG testing'

Oct 11, 2025

If a third party adapter gets stuck inside your OG, then you are going to have a real pain getting it out of there.

This happened here on a Roughtech Superlite with the factory-supplied M15x1 adapter. A drop of blue Loctite on the barrel threads followed by an overnight cure and the OG easily unscrewed. Removing the adapter required 10+ minutes with a heat gun, soft vice jaws, and a fair bit of swearing. Cleaned and degreased again, then Rocksetted. Filed down the hex corners a bit so the adapter fit properly inside the OG and all appears well.

• nm.otter

• 

 

[Antares]

I filed the corners off the factory Kimber adapter and Roksett it on. Hasn’t come loose yet.

 

[Cory_Shoot2Hunt]

I filed the corners off the factory Kimber adapter and Roksett it on, as @HuntHarder suggested. Hasn’t come loose yet.

View attachment 1075380
View attachment 1075381

This^^^

 

[Firth]

I filed the corners off the factory Kimber adapter and Roksett it on, as @HuntHarder suggested. Hasn’t come loose yet.

View attachment 1075380
View attachment 1075381

I think if it ever did came loose, my first try would be to redo the rockset, but with more. Or maybe try a a high strength loctite. I know rockset is better with heat, but I'm not sure which is stronger overall.

 

[Weldor]

Make friends with good machinist.

 

[JCMCUBIC]

I had the same question regarding M15x1. It would be nice if US made more than the 1/2" adapter and that those used the same removal tool. I understand there may not be enough demand though.

I have the tool and two 1/2's ordered.

 

[nm.otter]

M15x1 is too big for a 5/8"-24 concentric adapter.

 

[Cory_Shoot2Hunt]

I get asked not even once a month for an adapter other than 1/2. Or ppl saying they wish we made other ones. I’d say every 45 days? 9/16 is the most common oddball one.

 

[JCMCUBIC]

I get asked not even once a month for an adapter other than 1/2. Or ppl saying they wish we made other ones. I’d say every 45 days? 9/16 is the most common oddball one.

That's what I figured.

M15x1 is too big for a 5/8"-24 concentric adapter.

Not expected.

 

[Foster_65]

I get asked not even once a month for an adapter other than 1/2. Or ppl saying they wish we made other ones. I’d say every 45 days? 9/16 is the most common oddball one.

I would really like some 9/16 adapters. Early on I had a lot of mine threaded 9/16 as recommended by my smith. Wasn’t a bid deal as I only had traditional. Now with a couple of otb I’m nervous and would love to buy some with the tool

 

[Cory_Shoot2Hunt]

I would really like some 9/16 adapters. Early on I had a lot of mine threaded 9/16 as recommended by my smith. Wasn’t a bid deal as I only had traditional. Now with a couple of otb I’m nervous and would love to buy some with the tool

@Salmon River Solutions can explain this better…