Rust “Built Different” Update: What Server Admins Need to Know

Facepunch shipped “Built Different” — Rust’s June 2026 monthly update — on Thursday, June 4, 2026, and like every first-Thursday drop it’s a force wipe: both the map and every player’s blueprints reset. The headline content is a full player-model rebuild, but the changes that actually affect how your hosted Rust server runs are scattered further down the changelog. Here’s the version that matters to server admins.

First Things First: This Is a Force Wipe (Map + Blueprints)

“Built Different” is the mandatory monthly force wipe, not just a map wipe. That means both your map save and every player’s blueprint data are reset. If you run XGamingServer, the update and wipe are handled for you on the standard wipe schedule — no manual steps. If you’re self-hosting via SteamCMD, plan to wipe the server save and the blueprint data together, and announce the wipe to your community ahead of time so nobody’s surprised to log in to a fresh map.

New Player Models — The Headline, But Mostly Client-Side

The marquee feature is a complete rebuild of Rust’s player models: higher-detail faces and bodies, new hair shaders, new hairstyles (crew cut, bun, ponytail), and male/female body-hair options. Importantly, the race and gender seed tied to each Steam ID is preserved, so your players keep the appearance they’ve always had — just rendered better. For server admins this is almost entirely a client-side change; it doesn’t alter how you run the server, but it’s the first thing your players will notice on patch day.

New Loot: M16A2 and the Ballistic Armour Tier

• M16A2 — a high-end, burst-fire-only assault rifle (3-round bursts, 30-round 5.56 mag). It’s loot-only: it can’t be crafted or researched, only found in end-game loot. That changes the late-wipe power curve on your server, especially for PvP and raid communities.
• Ballistic Armour — a new loot-only armour tier (Ballistic Helmet, Vest, and Leg Armor) with higher projectile protection than metal gear. Plus a buffed BDU shirt/pants for early-game viability.

If you run a modded server with custom loot tables or a plugin that controls spawn rates, re-test those after the wipe — anything touching loot tables or item definitions is the most likely thing to need a config pass this month.

The Server-Admin Change That Matters Most: Optional New AI Navmesh

Facepunch added a custom Recast-based navmesh to replace Unity’s, and it ships disabled by default. Enable it with the launch flag -useNewNavmesh and you get smarter NPC pathing, threaded obstacle handling, instant load-from-disk on restart — and animals and scientists that can now path directly into player bases. That last part is a gameplay decision, not just a performance toggle. Don’t flip it on without reviewing your server rules and warning your community, because it materially changes how NPCs behave around bases.

New & Useful Admin Convars

“Built Different” adds several commands worth knowing:

• weather.rain_grace_period — controls how soon rain can start after a wipe.
• global.teleport2entityid — admin teleport straight to a UGC entity (there’s a new admin-panel button for it too).
• antihack.parenthistory — improved hit validation on moving parented entities like vehicles and elevators; helps cut false anti-hack kicks on busy servers.
• pool.usemutexpool 1 — reverts to the old object pool if the new “FuzzyCB” pooling system causes issues on your server. Good safety valve to know about.
• UsePlayerUpdateJobs 3 — can save roughly 0.6 ms/frame on busy servers.

Performance: A Net Win, No RAM Increase

The under-the-hood work this month is squarely in admins’ favour. Facepunch rewrote the object pool (lock-free “FuzzyCB”), added a StringView optimisation that cuts 60+ allocations per command, and removed or amortised around 20 server allocation sources. The result is lower server CPU load with no increase in RAM requirements. If you were sizing a plan for a high-pop server, nothing about “Built Different” pushes you up a tier — if anything it gives you a little headroom back.

Oxide / Carbon: Reinstall After the Update

This is the one that trips up self-hosters every wipe: Facepunch’s update overwrites Oxide and Carbon files. The workflow is always the same — run the Steam update first, then reinstall Oxide (uMod) or Carbon on top, then load your plugins incrementally while watching oxide/logs/ for errors. Carbon often updates to the new protocol faster, so it tends to get servers back online sooner on patch day.

The plugins most likely to break this month are anything hooking turret skins/assets (the Auto Turret is now Workshop-skinnable), player models/clothing (rebuilt this update), and AI/navmesh pathing. Re-test those first, plus any gather-rate and vending-machine plugins you carried over from the May wipe.

Other Notable Changes

• Workshop-skinnable Auto Turret — the Skin Viewer now supports turrets; community skin submissions open June 11.
• Animation overhaul — updated jump, sprint, crouch, and weapon animations with better third-person viewmodel matching.
• Paid DLC — an Industrial Decor Pack (20 cosmetic items) and a Bowless Crossbow skin.
• “Premium” renamed to “Premium Access Pass” (a cosmetic rename only — a separate opt-in “Rust Premium” subscription is teased for late 2026).
• Known issue: high-polling-rate mice (over 1000 Hz) can cause client-side performance problems — worth noting in your player-facing FAQ.

What Server Admins Should Do on Patch Day

1. Take a backup first — a snapshot before any update is cheap insurance.
2. Update and wipe — on XGamingServer the update and force wipe roll out automatically; self-hosters should run the SteamCMD update and wipe map + blueprints together.
3. Reinstall Oxide/Carbon on top of the updated server files, then load plugins incrementally while watching the logs.
4. Decide on the new navmesh — leave -useNewNavmesh off unless you want NPCs entering bases, and tell your community if you turn it on.
5. Brief your community — pin a note about the wipe, the new M16A2 and Ballistic Armour, and the player-model rebuild so players know what’s new.
6. Read the full notes — Facepunch’s official “Built Different” devblog covers everything we didn’t.

Overall, “Built Different” is a friendly patch for server hosts: real new content for your players, meaningful new admin convars, and genuine performance wins with no extra RAM cost. The only judgement call is the new navmesh — everything else is upside.