The Wounded Artist Project is a nonprofit that is sending art kits to war wounded recovering in military hospitals. They have produced a range of videos to help teach art including this video which shows how to draw an M4.
Gotta love that 'M4 still life' drawing at the start.
You can donate to the project over at their website.
I founded TFB in 2007 and over 10 years worked tirelessly, with the help of my team, to build it up into the largest gun blog online. I retired as Editor in Chief in 2017. During my decade at TFB I was fortunate to work with the most amazing talented writers and genuinely good people!