Direct Impingement and Gas Piston Explained

Many new shooters to AR-15/M-4 platforms are unsure of why they should use a Direct Gas Impingement (Gas Gun) AR-15/M-4 instead of a Gas Piston system.
Direct Gas Impingement Rifles are great, but have a tendency to not perform well with underpowered ammo or a dirty rifle.

How They Work
The cartridge is loaded into the chamber by the bolt carrier and the round is chambered. The firing pin then strikes the primer, and the round is sent down the barrel. Gas builds up behind the bullet and is then siphoned into the gas tube and sent back to the bolt carrier key. The bolt then moves rearward to compress the buffer spring. Once the spring is at its smallest compression, it expands and moves forward to pick up the next round, and the cycle starts once again. While leaving the buffer extension, the bolt carrier encounters a slight bump from the flange of the buffer tube. The bolt carrier will then start to oscillate slightly, causing the bolt carrier to bounce.

The Osprey System is one of a growing line of specially designed products in the ARK Defense portfolio. Israel M (Izzy) Anzaldua (Osprey Defense & Ark Defense Chief Operating Officer) describes the Osprey Defense Piston Drop in Kit as “simple, effective and robust.”

Example of the Gas Impingment System

Gas Piston systems run under the standard pressure curve of Gas Impingement Rifles. This is a benefit. Using ammo that is not MIL-Standard or even commercial grade will still function in our Osprey Piston System.

Osprey Bolt Carrier
The Osprey bolt carrier is tapered in the rear to avoid any bounce or oscillation when the carrier travels forward.

Our Gas Piston system is designed to relieve gas pressure and kept consistent bolt speed. This lowers the average of failure to feed and extract while in use. All gases not being used are released at the end of the piston chamber. The OPS-416 is mechanical and works consistently every time.

All moving parts are connected and secure. When fired, the op rod and piston only need to move three-fourths of an inch to function.

Gas piston systems will eventually be adapted for the military. Our systems can withstand sand, water and being frozen in sub-zero temperatures, and keep on running.

Direct Impingement Rifles
Need to have a constant pressure curve to meet an impulse to operate.
Gas Piston Rifles:
Use the piston chambers to achieve constant pressure and operate at a higher level reducing failure to feed and failure to extract.
To learn more about the Osprey Defense AR15/M16 Gas-Piston Conversion System, use our convenient contact form or call 757-689-4755.