Almost Real-life Gun

I work I had to do for school, like 3-4 years ago, the teacher asked for a perspective work, without any other restriction than the forced use of 2 vanishing points...
so when everyone decided to draw cars or building, I chose to draw a rifle ^^'

I wanted to do something close to the M4A1, but doing it all by memory was somewhat harder than I thought. So in the end I made a non-existant one, and I was surprised
the teacher himself told me that it looks like a Colt rifle (ppl in France hardly know stuff about guns, that's why...)

PS: I'll add that even though I love firearms, I think american gun laws are plain dumb... those 'toys' shouldn't be so easy to get. Mickael Moore is right, period.