This 551 sight is a compact red dot sight from Strike Systems that is made of metal and hard plastic

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it also has built-in Hatsan's SAS (Shock Absorber System) which is designed to reduce the recoil from the rifle greatly and also provide better precision when shooting

There is room for an extra magazine

Blade length: 13

FMA Specter Lyddæmper, Tan Legetøj This 551 sight is aNice different muffler from FMA. The muffler here is called Specter and has a length of 152 mm. It also has a nice thickness of 35 mm. Included is a 14 mm thread so you can choose whether it is CW (clockwise) or CCW (counterclockwise). Its weight is only 140 grams.