The SADLAK Front Rail Mounting System is designed for clamp-on type bi-pods and accessories while retaining your stock sling swivel. Steel Models uses unique internal Oval Nut plates specifically designed to fit the contour of four popular M14/M1A stocks. Once the nut plate is installed the rail can be installed or removed without rifle disassembly using two external screws through counter bored holes in the rail. Choose your Front Rail based upon your stock style, i.e. Universal, Wood, Fiberglass, Synthetic or Supermatch. The internal nut plate supplied with the Steel model is significantly stronger than screws and washers and will take the additional load from the bipod without danger o Mfg: Sadlak Industries