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A free-floating barrel is a firearm design used in precision rifles, particularly match grade benchrest rifles, to accurize the weapon system. With conventional rifles, the gun barrel rests in contact with the fore-end of the gunstock , sometimes along the whole length.
The G36 employs a free-floating barrel, meaning the barrel does not make contact with the handguard. The barrel is fastened to the receiver with a special nut, which can be removed with a wrench. The barrel is forged using a cold hammer process.
M&P10 Performance Center: chambered in 6.5mm Creedmoor, features a 20” barrel, Threaded Muzzle with Thread Protector, Two-Stage Match Trigger, Magpul Original Equipment rifle stock, 15” Free-Float Troy® M-LOK® handguard, 2” Aluminum M-LOK® Accessory Rail Panel and Magpul pistol grip.
The Canadian company Colt Canada (formerly Diemaco) licensed production of a rifle (Colt Model 715) and carbine (Colt Model 725), but later went on to produce an entire line of AR-15/M16 pattern weapons developed independently. In May 2005, Colt's Manufacturing Company acquired Diemaco, and the name was changed to Colt Canada.
The front handguard is in this system permanently attached to the upper receiver. The whole system is forged from one piece, and is sometimes called a monolithic rail. This system allows for a completely free floating barrel. Another unique feature is that the system can be adapted for different barrel lengths by screwing on an extension.
The SOPMOD kit is composed mostly of non-developmental items and commercial off-the-shelf (NDI/COTS) accessories packaged together to support four M4A1 carbines. [ 1 ] [ 3 ] It allows for the attachment of any Picatinny compatible accessory that fits the length of the weapon.
Drum sights with an improved front sight, a flash-suppressor/muzzle brake capable of firing NATO standard grenades, a fixed solid plastic buttstock, and a plastic handguard that does not contact the free-floating barrel. The handguard came in a slim, ventilated version and a wide version. The latter allows for the attachment of a bipod.
The handguard was made from full-length rifle handguard by cutting it in half and using either the fore or aft pair, after machining the ends to fit the slip ring and handguard cap. Because of the short barrel, the CAR-15 SMGs suffered from a loud and bright muzzle blast, and a number of muzzle devices were developed to reduce this.