The use of aftermarket airsoft parts is not an exact science. Some parts may require fitting even thought they were designed to fit without modification. Professional installation of upgrade parts is highly recommended.
This piston came stock in my g&g gr4 g26 which is basically a blow back combat machine. The piston worked well and have a very constistant fps. I went to the play airsoft two weeks ago. I geared up and went to the chrono station. The first shot I took was 250 fps. Then as the red asked me to shoot again, my gun would not shoot. The tech opened my gearbox and walah, there was this dude sitting in there broken. This price cost me 20 bucks for a top tec piston and 20 for labor. I ended up missing 2 out of the 5 games that day. Moral of the story is do not expect this piston to hold up if you upgrade the rof or the spring, the pick up tooth will be shredded right through. It lasted about 1500 rounds on an lonex high speed and 4000 on the g&g stock motor. Combat machines work incredibly well if they are not touched or upgraded, but replace this piston if you chose to upgrade your combat machine.
-works very well in the stock combat machine
-1 metal tooth
-2nd tooth missing for better angle if engagement
-gets you out of the games if you don't want to get shot
-bad piston if you are upgrading any gun
-pick up tooth is weak
-poor quality plastic
-made me waste 40 bucks
-horrible or upgraded combat machine set ups,CHANGE THIS PISTON IF YOU PLAN TO UPGRADE
Disclaimer: All airsoft guns are required to have the tip (1/4 inch) of the barrel permanently colored in blaze orange. No person may openly display or expose any imitation firearm (replica firearm), in a public place. The term "public place" means an area open to the public or exposed to public view and includes streets, sidewalks, bridges, alleys, plazas, parks, driveways, parking lots, automobiles, whether moving or not, and buildings open to the general public, including those that serve food or drink, or provide entertainment, and the doorways and entrances to buildings or dwellings and the grounds enclosing them. Any person who changes, alters, removes, or obliterates any coloration or markings that are required for by any applicable state or federal law or regulation, for any imitation firearm (replica firearm), or device in any way that makes the imitation firearm (replica firearm) or device look more like a firearm is guilty of violating the state or federal law. By accessing the Site, you certify that you are older than 18 years of age or the age of majority where you live, whichever is older; that you are the owner of any credit card used to purchase on items on the Site; that you are familiar with all local laws in your area affecting your legal right to access airsoft products; that any products you buy are for your own private enjoyment and that you will NEVER share these products with a minor in ANY WAY.