Anyone have info on CRB/Custom Rifle Barrels?

[epracmetcon]

I've chambered a whole mess of them and they all hammer right out of the box!

 

[AccuSol-ERN]

My favorite thing about CRBs is they are 4-groove.

4-groove or die......if you know, you know.

 

[scissorhands]

first few groups out of my 6gt CRB barrel. all 5 shot groups.