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In science and engineering, the parts-per notation is a set of pseudo-units to describe small values of miscellaneous dimensionless quantities, e.g. mole fraction or mass fraction. Since these fractions are quantity-per-quantity measures, they are pure numbers with no associated units of measurement. Commonly used are parts-per-million (ppm, 10−6), parts-per-billion (ppb, 10−9), parts-per-trillion (ppt, 10−12) and parts-per-quadrillion (ppq, 10−15). This notation is not part of the International System of Units (SI) system and its meaning is ambiguous.

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  1. E

    New member Remington 1858 parts

    Hi new member here just say hi I’ll be listing some cool Winchesters And possibly colts Winchester model 348 Winchester 30-30 Colt SAA Also looking for some orig parts For a Remington 1858 Thanks
  2. nvshooter

    Lower Parts Kit with Auto-sear Included

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  3. LVLouisCyphre

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