My AR came stock with a "tactical" muzzle break. The rifle shoots very accurately (1/2 MOA @ 100 yards) but is EXTREMELY loud. As in it feels like you're being hit in the ear drum with a hammer. Not really an issue at the range, but it causes issues when hog hunting- as I don't like to wear plugs when hunting. So I installed a Smith Vortex Flash Suppressor. The rifle got much quieter, but my once 1/2 MOA rifle suddenly became a 3 MOA rifle. I noticed that there is a gap between the crown of the barrel and the Vortex. This void is collecting powder residue, and I feel that this is the main cause in my accuracy drop. Has anyone else experienced this issue? The muzzle break has open threads, so there is not an inclosed void for the powder to get trapped in. Any advice on flash hiders that would not have the same problem?