![]() The fourth digit has been used many times as a way to different later models from earlier ones. As you can see, the exact meaning of the fourth digit depends largely on the preceding digits. Finally, the fourth digit is the finish or stock of your weapon: “1” is nickel or full blue finish, “2” is nickel or blue casehardened finish, “3” is nickel finish, “4” is Royal Blue casehardened finish and “6” is nickel finish.In the third digit is the caliber of the gun: “3” is 3 or 4 inches, “4” is 4.75 or 5 inches, “5” is 5.5 inches, “7” is 7.5 inches and “1” is 12 inches.The second digit of the model code is the weapon caliber: “4” is.“7” and “8” are employed occasionally to specify special variants. ”2” uses a frame from Colt Custom Shop while “3” utilizes a non-standard frame. In 1963 the AR-15 and M16 5.56mm automatic rifles 'made Colt the small-arms sensation of modern warfare'. For the first digit, “1” means your Colt is the first model with a basic frame while “2”, “3”, “4” etc are the later versions. The Colt AR-15 Barrel features a true 5.56x45mm NATO Chamber for use with both commercial and military surplus ammunition, while the 1 in 7' Twist Rifling is capable of stabilizing light to medium weight projectiles of up to about 77 grains. ![]() The prefix tells you the type of frame while the digits indicate the weapon version, caliber, barrel length and potential model variation. A Colt single action model usually possesses 1 character prefix and 4 numerical digits. Having a good understanding of the code shall let you recognize a particular model from its cousin with ease. It worth the time and effort to check out Colt model code as well since it contains lots of information about the gun characteristics. ![]()
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