Usa pa sad diay, kung same gun lets say with 20" barrel ilisan nimo ug 13" mas muhinay ang velocity, na try sad na nako using a chrony but wala jud ko technical data why nihinay. Pero gi explain sad na ni Noli nako before regarding barrel lengths. Pang hunting man jud ako-a so nangutana ko ug pinaka mubo na barrel but still effective sa short or long range shooting. Mao to gi recommend ni noli ang 19"