Now you can easily retrofit your AR15 / M4 Type Carbine to add the reliability, ease of maintenance, cooler running, and consistent function of the Gas Piston Operating System that has for years been so successfully used on AKs / FALs, and others.
The Bushmaster Gas-Piston Retrofit Conversion Kit is a Patent Pending, short stroke piston conversion system that includes all the necessary parts to convert your gas impingement type carbine. Once installed, there are no more gas rings, gas tubes or hot gases vented into the Receivers of your weapon. Instead, gases are vented under the hand guard, and away from the operator. The high performance Bolt Carrier features increased mass, an integral impact lug and specially designed anti-wear features to protect your receiver.
The Bushmaster Gas-Piston Retrofit Conversion Kit is readily installed into your factory Upper Receiver Assembly without permanent modifications to your carbine. You keep your factory receivers, barrel and bolt. The result is a cleaner and more reliable system sure to enhance the overall performance and reliability of your weapon.
Fits standard barrel rifles.
Installation note: this is a very easy kit to install. We suggest you seek the help of a qualified gunsmith to make sure the piston is installed correctly. We offer this service. It will require that you ship the upper to us for installation. Normal charges apply- approx $60.00, including testing (on our lower). We will charge you for return shipping ($12.00)