I put a brake on my M14 too, just a short one, about 2" long.
And I'm putting flash eliminators on more of my rifles. in 2008 I went over a little cliff and dropped my M14 , it took a funny bounce and centre-punched a rock with the muzzle. Based on the condition of the FE, I'd say the muzzle would have been wrecked without it. But I just unscrewed the birdcage and put on the brake I have now. I'm betting a re-crowning job is worth quite a bit more than the $35 I spent on this eBay brake (that works great, BTW)