Most of it is common sense; in public; dont wear camo - or atleast be subtle - personally on my way to games i tend to wear a black hoodie and dark green camo trousers and a baseball cap; nobody bats an eyelid.
In the past ive played games at Killhouse in the centre of leeds; ive carried pistols and a rifle on a bus in york, train from York to Leeds and then walked to the site and no one knew because they were concealed in an inconspicuous bag; no molle; no morale patches; no hard rifle case; just a holdall that looked like I was away for the weekend.
Once upon a time, I picked up 2 friends to take to the site for an evening game; one i was picking up from work at the Co-Op and the other from his house - simple.
First one - as he walked out of co-op he had the butt stock of his shotgun sticking out of his rucksack.
Second one - walked out of his house wearing a tac vest, belt, drop leg holster with pistol inside.
Safe to say I had very strong words with them both and that night spent the entire night expecting to see flashing blue lights - that thankfully never came.
I've been airsofting for nearly 20 years.
Keep your guns concealed at all times except at a site and dont wear tactical gear when youre not on site. You want to wear full camo when playing soldiers in the woods - thats perfectly acceptable; just dont wear it in tesco or McDonald's on the way there. SIMPLE.