A light grease like TW25B is nice for this. The moment this location is appropriately greased it's excellent for 1000s of cycles. Regarding the results of rounded rifling on precision, the rifling provides an angular velocity into a bullet so employing abrasives close to the muzzle will generate imperfections https://zandercfffe.bloggip.com/36128375/the-basic-principles-of-telc考试报名