The Chinese made J-7 is an advanced version of the formidable MiG-21 FISHBED. J-7 design improvements include a cranked-arrow wing for better low and high speed performance, two extra hard points on each wing for weapons, improved avionics and upgraded weapons systems. J-7 fighters are considered to be capable dog-fighters and can press close in air combat with the best western aircraft. The J-7 is not the front-line fighter that the PLAAF would prefer to replace its aging fleet of J-6 FARMER jets. However, nearly 500 J-7 fighters are in service with the PLAAF and the PLAN. Both export and domestic J-7 jets are fitted with a wide variety of western avionics including a GEC-Marconi Avionics HUDWAC (head-up display and weapon aiming computer) and GARMIN GPS bombing navigation systems.