What does a r in ar15 stand for?

What is a good selling price for a Beretta Model 20 25 cal? Im a jehovahs witness and my mom says witnesses do not bear arms but i really want a bb gun because all of my friends have it how do i convince my mom? What is the value of a Winchester model 101 serial? Is skeet choke more restricted than cylinder choke? How do you find the age of a Remington model 4 octagon barrel with no serial number? What is a 1989 browning a-5 12 gauge mag worth? Is the savage Stevens model 94 series m full choke? How old is colt pistol serial? What is the value of a 1928 Belgium Browning A 5 12 gauge in good condition? What could the value be for an 1863 springfield mustet be? How is a Springfield model 87a worth? Can you get amunition for model 36 25-36 marlin? What is the value of the JC Higgins model number 583.17? What year was the Remington score master model 511 22 built with production code yxx? What year and grade is the Remington sportsman 58 serial 59275V? How old is Crown Boiler Model AWI128SNST1PSU Serial B000454371? What is the value of a World War 2 Walther P-38 pistol with holster and spare clip? What is hard ball ammunition? How many different weapons are there? What is the value of a noble 12 gauge model 60 shotgun with a 32 inch barrel?