Rare weapon attachments can be some of the hardest upgrades to replace in ARC Raiders, especially when they appear to drop from loot instead of crafting. For players hunting the Kinetic Converter, Horizontal Grip, Silencer 3, and Anvil Splitter, the challenge is not just survival. It is knowing which maps, buildings, and container types are actually worth the risk. This guide breaks down the strongest known farming spots, the current theories around spawn behavior, and how to plan efficient raids around these high-value drops.

You will learn where these attachments appear most often, which rooms consistently outperform others, how day and night conditions seem to affect farming, and how to build repeatable loot runs around high-probability containers. If you are trying to protect your best gear, improve your stash of rare parts, or smooth out your ARC Raiders Workbench progression, these routes are the best starting point.

What Makes These Attachments So Valuable

The Kinetic Converter, Horizontal Grip, Silencer 3, and Anvil Splitter stand out because they currently behave more like rare loot than standard craftables. That creates two problems. First, they are hard to replace once lost. Second, many players hesitate to use them until they have built a reserve stockpile.

That stash-first approach makes sense. These pieces can meaningfully improve weapon handling or niche performance, and unlike common ARC Raiders weapon Mods, they are not something most players can expect to rebuild on demand. In practical terms, that means a farming route for rare attachments is also a route for long-term gear confidence.

It is also worth treating these as part of your broader ARC Raiders progression resources. A strong attachment can make a favorite rifle or SMG feel complete, but the real value comes from having extras ready for future loadouts, PvP kits, or late-game crafting decisions.

How Rare Attachment Spawns Seem to Work

The current evidence suggests two important patterns.

• These attachments appear most often in containers that can already roll attachment loot.
• Certain buildings and breachable rooms have a noticeably better hit rate than random map looting.

There is still some uncertainty around whether every valid attachment container can roll these items or whether only specific subtypes are eligible. Even so, some locations are producing enough repeat results to treat them as reliable farming targets.

Another useful takeaway is that breach rooms often line up with strong attachment spawns, but not every breach room is equal. Some are clearly better than others because of container density, loot table quality, or both. In other words, do not assume a locked or breachable space is automatically good. Prioritize rooms with multiple residential or attachment-capable containers over rooms that simply look valuable.

Best Buried City Farming Spots

Arto Tower Pharmacy Breach Room

This is one of the strongest rare attachment locations currently known. The main reason is simple: there are several residential containers packed into a compact route, giving you multiple chances in a short amount of time. For players targeting the Kinetic Converter, Horizontal Grip, Anvil Splitter, or Silencer 3, this room is one of the best places to start.

The efficiency here matters more than anything else. Even if the drop chance per container is low, repeated access to several valid containers in a single stop makes the room highly competitive over many raids. If your spawn lets you reach this area early, it is often worth prioritizing before the map gets crowded.

Plaza Rosa

Plaza Rosa remains a standout because it combines popularity with actual results. Like the Arto Tower pharmacy area, it appears strong because of the number of residential containers in a concentrated space. That gives it one of the best per-raid chances for these rare drops on Buried City.

This is also a practical location for players who want efficient ARC Raiders loot runs without overcommitting to a long route. Hit the room, clear the containers quickly, and decide whether to extract or rotate into a second target depending on noise, player pressure, and your inventory.

Zipline Ledge Building

A less obvious but still promising Buried City option is the building reached by taking the zipline and jumping to the ledge on the left. It has fewer residential containers than the top-tier spots, but reports around attachment drops here are consistently good enough to keep it on the route list.

This kind of location is ideal when you want a lower-traffic alternative. It may not match the raw container count of the most famous rooms, but it can still pay off if your goal is to avoid the busiest contest points while keeping access to attachment-capable loot.

Not every breach room on the map appears equally rewarding. Main Street, for example, has not shown the same level of success in reported runs. That is an important reminder that route quality should be based on proven container performance rather than room rarity alone.

If you are focusing on Buried City, the safest strategy is to build around Arto Tower pharmacy and Plaza Rosa first, then add the zipline ledge building as a backup or extension depending on spawn and raid flow.

If you want a map-specific companion read, check out our Buried City Town Hall guide for broader loot pattern planning on this map.

Best Spaceport Farming Spots

Container Storage Breach Room

On Spaceport, the container storage breach room is one of the clearest rare attachment hotspots. Reports consistently place it among the best farming locations on the map, and in many cases it appears more rewarding than at least one of the higher-profile key rooms nearby.

That makes it a high-value stop for players who want to convert a short raid into meaningful loot chances. If your route is built around attachment farming rather than general combat, this room deserves top priority.

South Launch Tower

Among the launch towers, the south side appears stronger for attachment farming because it offers more containers overall. More rolls means better long-run efficiency, and that matters when chasing items this rare.

If you only have time or safety margin for one tower, the south launch tower is the better first pick. The north side may still be viable, but the current evidence favors the south route due to container density.

North and South Trench Towers

The trench towers are interesting because the rare attachments do not seem tied to the key rooms themselves. Instead, the useful containers are accessed by getting onto the roof with mobility tools and dropping into the stair area, where a few lockers can roll these high-value parts.

This is a good example of why attachment farming in ARC Raiders rewards map knowledge more than obvious key access. A small cluster of overlooked lockers can outperform a more expensive room if those lockers are on the right loot table.

Take a look at: our legendary attachment farming guide

Shipping Warehouse Key Room

There are also reports of these attachments appearing in the shipping warehouse key room. It is not as universally praised as container storage, but it remains a valid route extension if you already have the key and your raid path supports it.

In general, Spaceport works best when you prioritize the breach room first, then branch into launch tower or trench tower options based on spawn and player traffic.

Best Dam Battlegrounds Farming Spots

Dam Battlegrounds may be the most interesting map for rare attachment farming because Control Tower has gained new containers and continues to produce strong results. Both the main room and the outside-accessible container area can drop these attachments, which makes the location unusually flexible.

The outside section is especially valuable because it can be reached from the top of the tower by using the ladder route, creating chances to loot attachment-capable containers without always committing to the full keyed interior. That kind of partial access is excellent for efficient farming.

Control Tower also has extra value because day raids can spawn level 3 weapons nearby. Even though those spawns are not guaranteed outside the room, the possibility of combining rare attachments with premium weapon loot makes this a strong all-in-one target for players building their reserve of ARC Raiders Weapons and upgrade pieces.

Dam Staff Room Key

The Dam Staff Room key area can also drop these attachments. However, it appears less appealing on day raids if your goal is maximum overall value, since the broader loot profile may not be as strong as other routes. Night raids may improve the risk-to-reward balance here, particularly if the map is quieter and you can clear the room without extended PvP pressure.

Hydroponic Dome Complex

For players who want a non-key route, the west-side Hydroponic Dome Complex is one of the better choices on the map. It contains several breachable containers and has produced enough positive results to be considered a dependable attachment farming stop.

This is one of the better options for players who want to avoid spending key durability or risking a route that depends on a single locked room. When the dome is on your side of the map, it is a very efficient addition to a broader farming plan.

Water Towers and Testing Annex Red Lockers

These are more secondary options, but both have produced enough reports to stay relevant. Water Towers can occasionally reward careful looting, while the Testing Annex red lockers are worth checking if your route already passes nearby.

Neither location should replace Control Tower or Hydroponic Dome as your main objective, but both are useful route fillers when you want extra rolls on attachment-capable containers before extraction.

If you also run this map for event efficiency, take a look at our Dam Storm Trial guide for safer routing and score-focused movement through the area.

What About Stella Montis and Blue Gate?

Stella Montis

Stella Montis remains less confirmed, but the most promising reports point to recycling cans around Medical Research and Sandbox, plus some shipping containers near Loading Bay. This information is still less established than the Buried City, Spaceport, and Dam Battlegrounds routes, so Stella Montis should currently be treated as a test map rather than a primary farming destination.

That said, if you are already running the map for ARC Raiders rare Blueprints or other loot goals, these container clusters are the best places to check while data continues to develop.

Blue Gate

Blue Gate is even more uncertain. Maintenance Wing breach rooms and parts of Ruined Homestead are possible candidates, but there is not enough consistent evidence yet to rank them alongside the best-known hotspots. For now, Blue Gate is better approached as an experimental route rather than a dependable source of rare attachments.

Take a look at: our Dam Storm Trial guide

At the moment, there is no hard proof that night raids, storms, or toxic conditions materially increase rare attachment drop rates. It would make intuitive sense if harsher conditions improved loot quality, but testing that properly would require a very large sample size across identical containers and routes.

The practical takeaway is simple: do not wait for perfect conditions. These attachments are clearly obtainable on day raids, and many confirmed finds already come from standard daytime runs. If night or storm modifiers do help, the advantage is not yet established enough to justify ignoring strong daytime opportunities.

For most players, consistent repetition beats speculative optimization. A clean route through proven rooms on a day raid is usually better than gambling on a harder condition with weaker map access.

Scrappy and Passive Rare Attachment Chances

Scrappy can also produce these attachments, though the chance appears very low. Agave currently seems like the best item to feed into that process based on available reports, while other mixes have not shown the same level of evidence.

This should not be your main farming plan, but it is a useful background strategy. If you are already managing ARC Raiders crafting Materials and base systems, Scrappy gives you one more low-effort path toward rare parts over time.

That also makes these attachments part of a wider resource economy. Players trying to avoid endless grinding often benefit from combining map farming with passive systems, stash discipline, and efficient use of ARC Raiders Materials instead of relying on one route alone.

Attachment Rarity: What Seems Most Common and Most Rare

Among the four major targets, the Silencer 3 appears to be the rarest. The Kinetic Converter, Horizontal Grip, and Anvil Splitter seem more common by comparison, even though all three are still valuable enough to stockpile.

Anvil Splitter may also feel less desirable depending on current balance and enemy behavior, but it remains worth keeping because tuning changes can quickly alter which attachments feel premium. In a game where gear value shifts with patches and player preferences, hoarding rare drops is usually the safer long-term choice.

Best Farming Strategy for Building a Stockpile

If the goal is to build a reliable stash rather than chase one lucky drop, use a repeatable route structure.

• Prioritize maps with proven rooms over experimental maps.
• Favor container density over long travel distance.
• Do not overstay after hitting your best loot clusters.
• Use lower-risk kits until your route is consistent.
• Bank duplicates instead of immediately equipping every upgrade.

For most players, Buried City is the best starting point because the strong rooms are compact and easy to repeat. Spaceport is excellent when you want a similar attachment focus with slightly different pathing. Dam Battlegrounds offers very strong upside, especially around Control Tower, but can become more route-dependent depending on spawn and contest level.

If your stash is thin, treat these attachments like premium ARC Raiders Items. Use standard loadouts for routine raids and only slot rare pieces when the rest of the kit justifies the risk. That approach protects your momentum and keeps your best upgrades available for high-value runs.

Frequently Asked Questions

Which map is best for farming rare attachments?

Buried City is the most consistent starting point thanks to Arto Tower pharmacy and Plaza Rosa. Spaceport and Dam Battlegrounds are also very strong once you know the routes.

Can these attachments drop on day raids?

Yes. Day raids are fully viable, and many confirmed drops come from normal daytime farming runs.

Based on current reports, yes. It appears significantly less common than Kinetic Converter, Horizontal Grip, and Anvil Splitter.

Do I need keys to farm these efficiently?

No. Some key rooms help, but several of the best routes rely on breach rooms, residential containers, or accessible side areas instead.

Should I use rare attachments immediately?

Usually no. Build a reserve first, then use them on loadouts that already have strong armor, healing, and backup value from your broader ARC Raiders extraction loot plan.