-improved, more realistic stock (the actual shoulder rest on the back of the stock can bend for added comfort)
-a shotgun sight (approximately showing where fragments will go)
-a shotgun firing runway (gradually widens to allow shell to seperate more horizontally)
NOTE THAT IF YOU HAVE NOT ALREADY BUILT THE C3 CROSSBOW, YOU NEED TO GO TO MY OTHER INSTRUCTABLE TO BUILD IT: https://www.instructables.com/id/The_C3_Crossbow/ THIS INSTRUCTABLE REQUIRES YOU TO HAVE ALREADY BUILT THE C3, BECAUSE THESE ARE THE IMPROVEMENTS.
Please visit my website for other lego guns like this: http://sites.google.com/site/bblegobrickworks/