I'd start by emailing Bergara to ask what they used, but I had a similar experience with a GAP-10. Turned out they used something called Rocksett. Soak the barrel and muzzle in water overnight. If thats the stuff they used it'll turn right off. Without the water soak I bent a piece of 1/4" steel trying to get it off. Some lessons are more painful than others.
I have 2 new Begera rifles. I listen to responses on African Hunter website, called 3 gun shops, watched YouTube videos and call Begera. After compiling and comparing advise I set out on the journey to loosen the muzzle brakes and can now screw them on and off barrel.
I wrapped my barrel with a rag and placed barrel in my shop vice. Grip was snug enough for barrel/stock would not twist and turn.
I then began to heat the muzzle brakes with my electric heat gun. It did not produce enough heat to loosen the muzzle brake.
I followed up with a propane torch. I did not allow the flame to touch the barrel or brake. I applied heat all around the muzzle brake. I placed a rod in the muzzle brake hole and suddenly the grip began to loosen. I screwed the brake completely off from the barrel. In a short time the barrel and brake cooled. I then use Hoppe #9 to clean thread section on barrel and the thread section inside the brake.
I oiled the barrel threads and screwed the muzzle brake back on to the gun and hand tightened it with the metal rod.
I will now be able to clean the barrel more easily and remove the break to give it a better cleaning.
Local gun shops were wanting charge me $130-150 to perform this job. Ridiculous!!
I have an unfired T rex 577 if anyone is interested in acquiring it . Absolutely spotless, flawless and well kept . It's rare as it gets . Mouth watering ? Let me know if you feel like making an offer .
Mr Brown in Calif.
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