UNDERSTANDING ABOUT ROLLER LOCKED AND ROLLER DELAYED

 

Understanding about Roller Locked and Roller Delayed

 

A.    Roller Locked System: Figure A

A Roller Locked system is a firearm locking mechanism that uses rollers to securely lock the bolt to the barrel or barrel extension during firing. This mechanical locking ensures that the bolt remains closed while the chamber pressure is high, only unlocking after the pressure is dropped to a safe level. The rollers physically lock the bolt in place, requiring a mechanical force to disengage them before the bolt can mover rearward.

 

In roller locked mechanism contain Two symmetrical rollers, Angled Locking Wedge, Bolt and Bolt carrier. The locking recesses are provided in the barrel extension or receiver. In the roller locked mechanism, the Locking Rollers are seated perpendicular to the straight surface of the angled Locking Wedge at the time of Battery.

 

In the below figure the A shows the roller locked Mechanism, it contains a Carrier, Bolt, Roller, Locking recess and the Angled locking wedge. In roller locked the rollers seated the straight surface of the angled locking wedge here the rollers are seated perpendicular to the straight surface of the angled locking wedge.

 

When the pressure of the explosion pushes the case head back against the bolt that force is transmitted to the rollers there which pushes against the recesses there and they have the tendency they want to go in they want to be squeezed in because that surface there is oblique, but they cannot go because the surface on the locking wedged is perpendicular to the roller.

So, the external force is required to kick back the Angled locking wedge with the bolt carrier, so the Angled locking wedge go rear by the external force hence the roller squeezed in and unlock the bolt. The external force is taken from gas piston or recoil system.

 

B.     Roller Delayed System: Figure B

Roller delayed blowback is a firearm operating system where the bolt’s rearward motion is delayed by rollers that engage recesses in the receiver. Unlike a fully locked breech, the bolt is not locked but instead delayed the rollers. When a round is fired, the bolt moves backward, but the rollers slow the motion, allowing gas pressures to drop to safe levels before the cartridge is ejected.

 

In this case roller delayed the rollers are seated the angled surface of the locking wedged instead of seated in the straight face of the angled locking wedge. And the Locking rollers are seated perpendicular to the angled or oblique surface of the angled locking wedge. So, what happens now when the pressure inside the cartridge case pushes against the bolt face, so the force is transmitted to the rollers, there after the roller pushes against the angled or oblique surface of the angled locking wedge. The rollers move inwards by the pressure and pushes against the angled surface of the locking wedge, the inward moment of the rollers unlock the bolt. The roller pushes the angled locking wedged small distance at the instant of squeezing. There after squeezing is completed finally the bolt, bolt carrier group and locking piece go to rearward. In roller delayed action the mass of the bolt will also plays a vital role.