This book provides with introduction and fundamentals of operation of small arms. Basic principles of ballistics are presented with simple calculations to enhance the understanding of the principles. These simple mathematical formulas include for instance shooting uphill and downhill, accuracy calculations with wind drift, barrel twist, recoil energy, and simple physics calculations. The Book presents with hundreds illustration pertaining to the design of small arms and also the skills of marksmanship adapted from the US army field manuals, and historical patents of M1 GARAND, THOMPSON MACHINE GUN, UZI, BROWNING HI POWER, 1911, LEVER ACTION 1894, SHOTGUNS, MAUSERS, WALTHER, AND MANY OTHERS