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Bill Wylde of Greenup, Illinois, compared the two cartridges and changed the chamber of the rifle's barrel to a specification he called the .223 Wylde chamber. The chamber is made with the external dimensions and leade angle found in the military 5.56×45mm NATO cartridge and the 0.2240 in (5.69 mm) freebore diameter found in the civilian SAAMI .
.223 Remington – Original AR-15 cartridge: .223 cartridges may function in a 5.56×45mm rifle, however 5.56×45mm cartridges may produce excessive pressure in a .223 Rem rifle. On the other hand, a .223 Wylde chamber is used on .223 Rem rifle barrels to allow them to safely fire either .223 Remington or 5.56×45mm NATO ammunition. [6]
The sporting rifle has both chamber options of 5.56×45mm NATO for the carbine specification and .223 Wylde for the SBR specification. [7] The LVOA-C weighs 7 pounds (3.2 kg) unloaded (7.5 pounds (3.4 kg) with a 30-round magazine) and measures 35.5 inches (90 cm) in length (32.75 inches (83.2 cm) with a closed stock). [8]
In the US builders of AR type rifles can specify barrels with either .223 Remington, .223 Wylde, 223 Noveske, or 5.56×45mm NATO chambers in lengths from pistol (7.5") to long rifle (24"). These barrels are also available with rifling ranging from 356 mm (1-in-14") to 178 mm (1-in-7").
The firearm was offered in .300 BLK, 6.5 Creedmoor (The first production semi-auto bullpup chambered in this cartridge), along with its original .223/5.56 and .308/7.62 calibers [1] [5] as well as 20" barrel and side ejection options. [3] This update is considered the generation 3 MDR gas system. [10]
The .223 Remington (designated 223 Remington by SAAMI [4] and 223 Rem. by the C.I.P., [5] pronounced "two-twenty three") is a rimless, bottlenecked, centerfire intermediate cartridge. It was developed in 1957 by Remington Arms and Fairchild Industries for the U.S. Continental Army Command of the United States Army as part of a project to create ...
The rifle itself is offered in two variants: the S-5.56 A1 with a 19.9-inch barrel and 1:12 pitch rifling (1 turn in 305 mm), optimized for the use of the M193 Ball cartridge; and the S-5.56 A3 with a 20-inch barrel and a 1:7 pitch rifling (1 turn in 177, 8 mm), optimized for the use of the SS109 cartridge.
Smith & Wesson offers the M&P15 semi-automatic rifles in different configurations, tailored to specific shooting applications and styles. The rifle has different models that come chambered in 5.56mm NATO/ .223 Remington , .22 Long Rifle, and 5.45×39mm.