Should You Install a New Bolt w/This Barrel? Some of our customers have suggested that we should include a new bolt with our LR308 pattern AR barrels. THEY say you should install a new bolt anytime you install a new barrel. On the other hand WE'RE trying to keep costs down and if you already have a good bolt, there's no sense in adding the cost of another one if you don't need it. So, we leave it up to you. Our Nickel Boron LR308 pattern AR bolts are excellent and reasonably priced!