This system will work with .223/5.56 x 45 mm NATO.
Requires a .750" or 3/4" shoulder on the barrel where the gas block sits.
Works on multiple barrel contours and lengths.
Requires an existing pistol length gas system - meaures approximately 4.486" from barrel extension to shoulder.
Comes with the following:

Gas Piston Drive Rod
Picatinny Railed Gas Block
One-Piece Bolt Carrier
Bolt Spring
Samson 4" Free Floating Quad Rail
Modified Hand Guard Cap
Receiver Bushing and Installation Rod
Instructional DVD

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