I don't like the idea of the gun skin being accessible by all members of that Gang. Maybe if they were allowed to purchase the skin for $1 on a different tag related to the Gang? That way the Gang can continue Recruiting and basing without worrying about people just joining for their hard-worked-for gun skin.
Tl;Dr
A sub Gang is granted access to the skin instead of the main gang, like iFreeze GST did with their shipka skin