вот например американское поделие
Image may be NSFW.
Clik here to view.
http://www.thefirearmblog.com/blog/2015/11/16/bullpup-ar-convert/
Image may be NSFW.
Clik here to view.

http://www.thefirearmblog.com/blog/2015/11/16/bullpup-ar-convert/