Nerf darts don't taper like a 7.62 round does, so any bend will cause the darts to crush. Unfortunately there's no good way to do it without making the the magazine overly wide and therefore unrealistic.
That a great looking weapon. I finally got myself a Nerf gun, an "elite strongarm". I was just wondering what paint you use on the moving parts like the trigger. Something strong so the paint dosnt wear off after repeated use?
Unfortunately the plastic they use stops just about any attempt at getting paint to stick. I personally use a plastic primer for car bumpers, but even that's not fool-proof. Its just something that's bound to happen if you make these for use and not display. I hope you'll still have a go at it, those little spots can always be touched up if they happen!
All paint works for different situations. Most any rattle can paint acts the same, so my advice is to try them all and see what you get. You may find that you love using something that I've left on the shelf for years. That's the great thing about art is that even if you try to emulate a particular style, you own overpowering natural style will eventually win. Give all the paints a shot and just keep at it until things start to make sense in a way that you'll understand and learn from. That's the best advice I have to give