Can 5.56mm ammo be safely fired by an AR15 model sp1?

What is the value of a model 904 Harrington and Richardson 22LR? Does a cap gun shoot? What kind of guns did they use in 1587? What is the value of an old French or Belgian shotgun? How old is worthington 12ga special? What is your Winchester mod 94 you purchased in 1966 serial number 3106115 worth? What is the value of a mauser model hsc 7.65mm serial number 712700? What is the age and value of a Springfield model 15 22 cal? Where are the engine serial number located on a 390 in a 1964 galixies? Where can you find information on the Wards Western Field 22 cal SL-LR rifle? How old-12 gauge-browing-356155? Can you pawn a gun not registered to you in Alabama? Where is the serial number located on a 30-30 centennial 1966? What is a Winchester Model 61 22 worth? What is the value of a Sears 410 bolt action shotgun? What produces the spark to ignite the gun powder? What is the value of a Browning Belgian made 9 mm handgun serial number 10331 model 1922? What are the different action types on guns? Why is ammunition so hard to find? How do i fix 32 cal auto?