Good quality item - Tacfire Muzzle Brake Jam Nut

I had recently purchased a muzzle break from Optics Planet and was having trouble getting it aligned properly using a standard crush washer. I decided to order the Tacfire muzzle break jam nut to correct the problem. The jam nut was a good quality item. It was just the perfect thickness to lock the new muzzle break in place at the correct position. I will use the jam nuts in the future for two reasons the first is that it only takes a second to get the timing correct and the second is they are reusable.