DEMO RS Regulate Yugo Front Biased Lower Modular Side Mount Fits Yugo/Serbian Type Rifles Not Compatible with Folding Stocks Matte Finish Black. 58s. Specifications for RS Regulate Yugo Front Biased Lower Yugo/Serbian Type Rifles Rifle Rail Mount: Manufacturer: RS Regulate Color: Black Finish: Matte Fabric/Material: Aluminium Base/Mount Type: Side Mount Gun Make: Zastava Gun Model: Zastava M21 Zastava M77 Zastava M70 Gun Type: Rifle Length: 5.71 in Width: 1.88 in Weight: 3.37 oz Features of RS Regulate Yugo Front Biased Lower Yugo/Serbian Type Rifles Rifle Rail Mount: Yugo Front-Biased Lower Package Contents: RS Regulate Yugo Front Biased Lower Yugo/Serbian Type Rifles Rifle Rail Mount