Magazine KP-18 / KP-13F GBB 23rdsDetails Weight: 280 g Shipping weight: 300 g KJ Works KJ Works is one of the most experienced producer and manufacturer of GBB airsoft replicas in the market. Their goal is to provide high quality products at an affordable price. The reputation that KJ Works gained from the customers, attention to detail and quality control has been recognised by real firearms license holders and established a cooperation to make replicas under license for them.