How much a slide fire stock for ak47 would be?

Question by : How much will slide fire stock for ak47 would be?
Don’t answer this if u never knew they still working on ak47 slide fire stock.. Btw sorry about bad english

Answers and Views:

Answer by IDF
Here you have answer .
http://www.shootingtimes.com/2011/07/22/shoot-your-ar-15-faster-than-ever-with-a-slide-fire-stock/
Be smart , you will find it .