King Arms dumped to us their product parts list for gas blowback rifles, though we still prefer the way Mark Ng's updates than this. Interested retailers can check the list provided below. If you want bigger screenshots, you can click on the images provided below to view larger image (will open in a new window).

Here's the rundown of the list:

• KA-GBBP-01- High Power Bolt Carrier Set for M4 Gas Blowback
• KA-GBBP-02- Bolt Carrier for M4 Gas Blowback
• KA-GBBP-03- High Power Loading Nozzle Set for M4 Gas Blowback
• KA-GBBP-04- Charging Handle Set for M4 Gas Blowback
• KA-GBBP-05- Dust Cover Set for M4 Gas Blowback
• KA-GBBP-06- Hop Up Chamber Set for M4 Gas Blowback
• KA-GBBP-07- Buffer Lock Housing for M4 Gas Blowback
• KA-GBBP-08- Forward Assist Set for M4 Gas Blowback 
• KA-GBBP-09- Hammer Set for M4 Gas Blowback
• KA-GBBP-10- Trigger Guard for M4 Gas Blowback
• KA-GBBP-11- Trigger with Sear Set for M4 Gas Blowback
• KA-GBBP-12- Bolt Catch Set for M4 Gas Blowback
• KA-GBBP-13- Stock Tube Set for M4 Gas Blowback
• KA-GBBP-14- Receiver Pin Set for M4 Gas Blowback
• KA-GBBP-15- Mag Catch Set for M4 Gas Blowback
• KA-GBBP-16- Hammer Lock Set for M4 Gas Blowback
• KA-GBBP-17- Recoil Spring & Buffer for M4 Gas Blowback
• KA-GBBP-18- Buttstock Speed Buffer Set for M4 Gas Blowback
• KA-GBBP-19- Hop Up Rubber for M4 Gas Blowback
• KA-GBBP-20- Selector Lever for M4 Gas Blowback
• KA-GBBP-21- Gas Route Rubber for M4 Gas Blowback Magazine