5R rifling can be a style of rifled barrel that is characterised by 5 Similarly spaced lands and grooves. This design is said to improve accuracy and consistency by lessening friction and muzzle leap. 特に、今まで過剰消費型の生活をしている方は、ごみを捨てない習慣は、なかなか身に付かないものですね。少しずつ、心がけるようにしましょう。 Elevated barrel lifestyle: The 5 lands and grooves ... https://jeanr999fqb2.bloggactivo.com/profile