Enhanced gun play, NPC & trader economy, and weapon diversification. Fully upgradeable weapon profiles, numerous variants of each gun. No longer will you go through the zone seeing everyone with the same AK.
Here's a look at the Colt 1911 variants.
Each camouflage variant has a unique back story and is based off of a real life military camouflage pattern. Usually they are meant to be collectibles & are quite rare within the zone. Here's an excerpt from this particular Colt 1911 Camo variant's description.
"The Colt 1911 has seen employment in the South Vietnamese Military, along with numerous other countries including the United States of America & Soviet Union during both world wars. This particular model is using a South Vietnamese camouflage based on the US m1948 ERDL camouflage pattern. This ARVN "leaf" or "Airborne leaf" pattern was a fairly accurate copy of the US ERDL design, having the same mid-brown, russet, & biege organic shapes with dark brown branches."