What is M USD?

Information on the Western Auto Supply Companies Revelation Model 200 .30-.30 caliber rifle Who manufactured it and what is it's accuracy like.? What is the value of a Colt Model 1900 automatic pistol? What is an example of 7mm? What is the value of a Crosman 130 pre 1970? What is the rate of twist in a Stevens 200 in 22-250? What is value of Rossi 22 model 511 stainless? Was there a gun maker in Chicopee your husband bought a single barrel shotgun with the name Chicopee Mass on the side of it It also had Riverview and made in US you were wondering how old it was? Is a brno cz rifle a 30-06? How much is a 50 Caliber Gun are bullets? Is burris rifle scope 3-9 x 32mm good for Remington rifle 505-1? Does a Bullet have to hit to kill? Who made the Peerless 28 gauge single shot serial number 119311 and how much is it worth and how old is it? How do you dismantle a 32 caliber self loading gun? What is the value of a Wards Hercules 16 gauge single shotgun? What is the value of Remington 22 calber with octagon barrel? What are the differences between the M4 and M16? Side by side twelve gauge shot gun with the only markings on the side Chicago? What is the value of a HK 94 shot a few times perfect condition? Where to get parts for revelation R107A 22 magnum-WMR? How many bullets are there in the world?