First off you should be able to sell guns. Not like if you buy prototype for 300 and you sell it for 300. You should be able to sell it for half price. Two there's a glitch with reloading where when reloading you can click the reloading gun or another gun and back to the reloading gun and you can shoot even if it is reloading.
Edit: It's just ideas
Edit: It's just ideas