Weight:&;4lbs 3oz&;*Rifle Only Threaded:&;Yes 1 Piece Picatinny Rail Flush Detachable Mag Limbsaver Tool-less Firing Pin removal Machined Receiver and Forged bolt Large Integral front barrel lug Bolt has integral bolt handle and pressure vent holes One of the safest actions on the market Reliable M-16 Style extractor/ejector Stringent and exacting headspace specs. Bolt faces are true and square to the chamber Compatible with rings Stock no 4539