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PWS RIFLE PISTON RETROFIT KIT
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In Stock for Installation
Manufacturer: Primary Weapon Systems
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This Piston Retrofit kit is installed here at our premises, test fired, and returned to the customer within 2 weeks of receiving your upper. Upon order confirmation you will receive an email with shipping instructions. Online purchase is required to reserve parts for your install.
Installation
This retro-fit system is installed by fitting our modified carrier key and anti-shear pin on the customer's existing bolt carrier and the operating rod is pressure fit into our carrier key. The gas block assembly is installed and setscrewed in place, then staked for reliability.
Function
When the rifle is fired, the developing gases expand inside of the gas block much like a traditional DI system. The expanding gases push against our short stroke piston which exerts pressure on the operating rod and thus gives momentum to the bolt carrier. Once the piston itself has traveled 3/4", it expels any unused gas from a small vent in the bottom of the piston tube. As the cycle of the action is already in progress, the piston moves to the back of its chamber awaiting the return of the operating rod to push it back into battery.
System Features
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Available for Carbine, Mid and Rifle length systems
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A dual diameter piston for better alignment and less wear
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Carrier key and anti-shear pin machined from pre-hardened tool steel
- A mothered operating rod to inhibit flexing or bending
- QD disassembly for cleaning
- The operating rod is attached to the carrier to minimize carrier deflection and receiver wear.
- Adjustable gas system for firing unsuppressed and suppressed
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All parts are CNC machined and heat treated; no welded or cast parts are used
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Lifetime Guarantee
The installation of the system will be done within a 2 week period after the customer's upper is received.
Currently our retro-fit system will fit under the following hand guards:
The top of the handguard must not protrude past the gas block. Handguards that extend past the sides and bottom are acceptable.
* this system is only for the AR15 series rifle in .223/5.56, 7.62x39, or 6.8SPC. We will not install it on other calibers.
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