Webjun 25, 2013 · $2300. Bore guides are 100% solvent resistant. Bore guide is machined with a snout that extends into rifle chamber. Silicone o ring that seals off chamber. Webthe easiest and safest way to preserve the accuracy of your bolt action rifle is to clean your rifle from the breech/chamber end using a bore guide. Almost all bore guides, with the. 169 202 205 25.