I don't know about your specific examples but see http://www.brickarms.com http://www.brickarms.com for one. Lego doesn't make guns so they filled that void. I

I don't know about your specific examples but see http://www.brickarms.com http://www.brickarms.com for one. Lego doesn't make guns so they filled that void. I believe it was originally just a guy in his home/garage.