Drilling out a Thunder Beast 223 brake

[Wisconsinvette]

I have a 30 cal Ultra 7 coming. The smallest thread they make the 30 cal mount in is 9/16x24. I am shooting 7mm and if I only have .600 at the muzzle would there be any reason I shouldnt just thread it 1/2x28 and buy the .223 brake and just drill it out for 7mm?

 

[Ucsdryder]

Call thunderbeast. They're awesome.

 

[tdean]

No I have done it. It's hard to drill out better to have a smith do it in a lathe


Or get a 1/2-28x5/8-24 adapter

 

[DocGlenn]

I had my smith do the same thing for my 7WSM. Worked well.

 

[Okanogan]

TBAC doesn't sell 1/2-28 CB brakes for anything larger than .223 because they claim past experience says there is a chance that with the suppressor weight and the little remaining wall thickness of the barrel, you could experience fatigue cracking of your barrel. They used to sell the 1/2-28 brakes in 30 cal because I bought one many years ago. I think at one point they told me if I was adamant in wanting another 1/2-28 brake in 30 cal that I could do just what you suggest and buy the smaller brake and have it drilled out, but they don't recommend doing so.

 

[azsugarbear]

Make sure you don't run afoul of any Class 3 regulations. On all my Class 3 suppressor paperwork it shows the caliber as well as the serial number. I would check with BATFE before drilling out. Do it in an email, so you have something in writing if questioned down the road.

I would go with tdean's suggestion above and get the adaptor.

 

[Tyler Kee]

TBAC has incredible customer service and are great smiths. Call and ask. They'll help you figure something out.

 

[parshal]

I've asked them before about drilling out a UL7 6.5 and they said don't do it. Please report back what they say. I'm curious, too, to see others have done it. It seems pretty straightforward on a lathe although you'd have to pay attention to galling of the titanium.

 

[Wisconsinvette]

It would be done on a lathe for sure. As far as adapters I just hear bad things about stacking tolerances so figure it would be better not to.

 

[Kimber7man]

He's asking about drilling out the Compact Brake that screws onto the threaded muzzle, not altering the actual suppressor in any way.

You could also send your barreled action to Thunderbeast and they can build up a shoulder.

 

[parshal]

I Didn't catch that it's the adapter. Drill away on that! That's no different than opening a brake.

 

[skipglo]

I'd drill it..and you don't need a lathe if you use a quality drill press....I have opened 3 so far with no problems.

 

[QuietTexan]

You could also send your barreled action to Thunderbeast and they can build up a shoulder.

This. I can't find one now, but I would have bet a good bit of money I'd seen a false shoulder where you thread the barrel longer than normal at the largest thread you can cut, run this down it. Expands out at the end to give you a much larger shoulder to mount off.

Basically makes the barrel look like the Ruger 450 Bushmaster barrel:

Ruger American® Rifle Ranch Bolt-Action Rifle Model 16950

ruger.com

 

[squeeeeze]

A smith has opened up three 1/2"-28" for me. 2-CB's and 1-FH.