Tired of inconsistent gas mags? How about expensive magazines that only hold 30 rounds? This conversion kit takes your GBB from heavy, expensive low capacity magazines to consistent FPS and M4 AEG midcaps! Check out alyan airsoft for more info. This is the latest kit (Gen 3) and is BRAND NEW. Never used or installed. I purchased it last month for $190 shipped USD. Don’t wait weeks for overseas shipping and save on a brand new product. Some modification of the rifle may be required to install it. There are guides on youtube. If you have any questions feel free to ask. NO TRADES. Price is OBO and without shipping or fees. Thanks for looking and have a great day.