Adams Arms SBR Rifle 11.5 inch

HOW DOES AN AR-15 WORK?

In the 1957 Eugene Stoner developed the AR15/M16 rifle that shoots the .223 Remington/5.56 NATO caliber rounds. The design of this rifle utilizes the gases that push the bullet down the barrel to cycle the action of the semi-automatic and full-automatic AR15/M16 rifle.

These gases are vented into a gas tube through a hole on the barrel (the gas port). The gases travel back toward the receiver of the firearm and use its pressure to push the bolt carrier backwards toward the stock of the rifle.

This rearward movement of the bolt carrier rotates the bolt out of chamber (by utilizing the cam pin and cam pin channel) which will eject the empty casing of the fired round. The bolt carrier travels against a buffer and spring in the buffer extension tube (located inside the stock) just behind the receiver.

This compresses the buffer spring that will push the bolt carrier forward toward the magazine and barrel. The bolt carrier and bolt then strips a new round from the top of the magazine feeding it into the barrels chamber and rotates the bolt to lock into place. This utilization of gases to cycle a firearm’s action is known as Direct Impingement. It is the biggest flaw and concern with the AR15/M16. Because these gases are released into the receiver, a layer of carbon and burnt gases coat all the moving part of the firearm. This also leaves a lot of heat inside the receiver causing undue stress and wear on many critical parts. All of these issues give the AR15/M16 a reputation for being unreliable and having issue like failure to feed and failure to eject. In a combat situation this could be the difference between life and death.

THE ADAMS ARMS DIFFERENCE

The Adams Arms Retro-Fit Piston Drive System uses the same gas port on the barrel to work the action of our inverted piston. Instead of directing the gases into the receiver, they go into a gas plug and drive rod sleeve invented by Adams Arms. The gases are contained inside the drive rod sleeve and push the bolt carrier rearward using the gas pressure to cycle the action.

Adams Arms proprietary operating systems mechanically actuate the bolt carrier external of the receiver. This keeps the internal receiver and all the critical moving parts clean and free from heat and carbon build up.

Here are some of the main differences when using the Adams Arms Operating System:

• Short Stroke Free Floating Piston System
• Self Cleaning
• Carbon and gases are expelled forward, away from the operator
• Bolt Carrier Group and other critical components remain cool and clean
• Corrosive resistant coating processes
• Harmonics are not transferred into the barrel
• Adjustable gas settings for various applications
• Doesn’t vent direct to atmospheric pressure; this eliminates flash signature and supersonic crack which is optimal for night vision and suppressed fire