R50 stands for Rifle - 50 Rounds in complementing contrast to the P50, the pistol version of the same platform. This carbine features a side-folding stock that rests nicely on either side of the grip when folded and a ½ x 28 threaded - 16 inch barrel. It does come with some utility sights that are adjustable for windage and elevation, however the R50 receiver offers over 7 inches of picatinny rail space up top for mounting just about any optic or accessory you like. 2 inches of rail space on the bottom is ideal for light and grip options. There’s a QD sling cup just above the magazine release for mounting a single point sling and the AR style charging handle offers smooth manipulation.

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https://www.usedguns.com/Item/Details/KEL_TEC_RIFLE_R50/F781D6F6C35149ADBE306DBA56B33517

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