As an Amazon Associate, we earn from qualifying purchases. OS Engines FR5-300 Sirius 5-Cylinder Radial 4-Stroke Engine | Horizon Hobby OS Engines . OSMG1300 Gallery Attributes Brand name, Manufacturer name, ManufacturerOS Engines Extra Product NameOS Engines FR5-300 Sirius 5-Cylinder Radial 4-Stroke Engine | Horizon Hobby moq, multiple, tierMinQty11 MPN, SKUOSMG1300 qtyInStock0 tierPrice14399.99 Distributor offers SellerSKUMOQIn stockMultiplePrices horizonhobby.comOSMG1300111 @ $4399.99