The Gunsmith update in TTK Testing turned every weapon into a four-slot puzzle, and knowing how each attachment slot behaves is the difference between landing recoil-tight bursts and spraying shots into a wall. This guide breaks down every TTK Testing attachment category — optics, grips, scopes, and underbarrel — using the live V0.09 build as the reference point so you can build loadouts that actually match your playstyle and weapon class.
TTK Testing's Four-Slot Attachment Framework
The Gunsmith system introduced in V0.04 layered four distinct attachment slots onto every firearm in the game, and the V0.09 live build has since expanded what each slot can hold. According to the official TTK Testing page on Roblox, the game pins Helmet Cam to P and recommends Transparent Optics in Settings so both eyes can stay open while aiming — a setting that directly affects how TTK Testing optics and scopes feel in practice.
Every weapon in the gunsmith shares the same four-slot structure, but not every slot accepts every piece. ARs, SMGs, DMRs, battle rifles, and sniper rifles each have a filtered pool of compatible attachments, and pieces that don't match a weapon's caliber or frame simply won't equip.
The Four Attachment Slot Purposes
| Slot | Primary Purpose | Compatible Categories | Key Trade-Off |
|---|---|---|---|
| Optics | Sight picture + magnification | Red dots, holos, ACOG, sniper scopes | Faster target acquisition vs zoom precision |
| Grips | Recoil + handling control | Vertical, angled, stubby, ergonomic | Recoil control vs ADS speed or movement speed |
| Muzzle | Muzzle climb + concealment | Compensator, muzzle brake, suppressor | Vertical kick vs sound/flash signature |
| Underbarrel | Utility + stability | Laser sight, foregrip, bipod, shotgun | Added function vs added bulk |
These four slots work as a system, not in isolation. Swap a compensator in and a vertical grip usually has less work to do; pair a stubby grip with a heavy muzzle brake and your ADS speed pays the price. The gunsmith rewards players who plan two or three slots at once instead of chasing single-piece "best in slot" picks.
Attachment Unlocks and Progression
Community testing reported by players on the developer DevForum shows that most TTK Testing attachments are unlocked through Gunsmith challenges tied to weapon class, not raw account level. AR mastery tasks unlock vertical grips and certain holos, while DMR challenges open angled grips and ACOG placements. As of the V0.09 build, sniper-specific TTK Testing scopes still gate behind long-range challenge milestones.
TTK Testing Optics and Scopes for Every Range
The optics slot in TTK Testing is the most visible customization choice and the one most players change first. The V0.09 gunsmith offers four practical families — red dot, holographic, ACOG, and magnified sniper scopes — plus cosmetic variants for each. For a deeper breakdown of sight-picture tuning and the Transparent Optics toggle, the TTK Testing optics settings guide walks through the keybinds and visibility trade-offs in detail.
Optics Family Comparison
| Sight Type | Best Range | ADS Speed | Lens Behavior | Strongest Weapon Match |
|---|---|---|---|---|
| Red Dot | 0–40 m | Fastest | 1x, parallax-free | SMG, short-barrel AR |
| Holographic | 0–50 m | Fast | 1x with reticle ring | AR, carbine |
| ACOG (4x) | 40–120 m | Medium | Magnified chevron | DMR, battle rifle, BR |
| Variable Sniper Scope (6x–12x) | 120 m+ | Slowest | High mag, eye relief matters | Sniper rifle only |
The Transparent Optics setting matters more than most players realize. When the option is off, the optic lens renders as a full opaque circle that crops peripheral view, which makes close-range tracking noticeably harder. Turning it on lets the game render the world through the lens with both eyes open, which is how tactical shooters train real-world shooters to use a TTK Testing ACOG at medium range.
Recommended Optics by Weapon Class
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Assault Rifles: Holographic for close-to-mid ranges, ACOG when you expect 50 m+ engagements. A red dot only wins when the rest of your build is built around run-and-gun.
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SMGs: Red dot only. A holographic reticle ring is technically compatible but the lens housing is wider than an SMG's natural sight radius, so the visual clutter adds nothing.
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DMRs and Battle Rifles: ACOG is the default competitive pick because the 4x chevron matches the velocity profile of 7.62-class rounds. Magnified sniper scopes don't fit these frames.
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Sniper Rifles: The variable scope is the only slot choice that makes sense, since 6x–12x magnification is what the frame was balanced around. The TTK Testing sniper scope guide covers magnification tuning in more detail.
Community testing on the public beta branch suggests the developer is actively tuning sight housing size, and a small reticle adjustment may land in a future patch. As of September 2026, the V0.09 numbers above are the cleanest reference for picking TTK Testing optics by range bracket.
TTK Testing Grips: Controlling Recoil and Handling
The grips slot is where the gunsmith system gets interesting, because every grip trades one stat for another and the "right" pick depends on which stat you can afford to lose. TTK Testing grips come in four families: vertical, angled, stubby, and ergonomic, and each one is mapped to a specific recoil or handling axis.
Grip Trade-Off Table
| Grip Type | Vertical Recoil | Horizontal Recoil | ADS Speed | Movement Speed | Best For |
|---|---|---|---|---|---|
| Vertical Grip | High reduction | No change | Slight penalty | No change | Full-auto AR, LMG |
| Angled Grip | No change | High reduction | No change | Slight penalty | DMR, burst-fire |
| Stubby Grip | Moderate reduction | Moderate reduction | Fast recovery | No change | SMG, close-range |
| Ergonomic Grip | No change | No change | Strong improvement | Strong improvement | Sniper, mid-range DMR |
The vertical grip is the default "feels better" pick for most AR players because vertical kick is the most visible recoil pattern in the V0.09 gunsmith. But for a DMR where every shot is aimed and the first-round kick matters more than sustained fire, an angled grip often wins because it cleans up the left-right drift that throws off follow-up shots.
Choosing a Grip for Your Weapon
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Full-auto AR: Vertical grip. The recoil axis that hurts the most is vertical, and the ADS penalty is small enough that it doesn't matter in the ranges where ARs thrive.
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Burst-fire / DMR: Angled grip. DMRs fire slower, so horizontal drift compounds between shots, and the ADS penalty is negligible.
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SMG: Stubby grip. The faster recovery helps the next burst land before the target crosses a doorway.
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Sniper rifle: Ergonomic grip. You only need one shot, so the priority is getting the next scope-up ready as fast as possible.
Pairing rules matter here. A vertical grip with a compensator is a common stacking mistake — the muzzle device already eats most of the vertical kick, and the combined ADS penalty is bigger than the recoil control gain. Most community-tested optimal builds use a vertical or angled grip with a muzzle brake instead, or a stubby/ergonomic grip with a compensator.
TTK Testing Underbarrel Attachments: Utility and Stability
The underbarrel slot is the most overlooked piece of the gunsmith system, but it carries the most build-defining utility. TTK Testing underbarrel options fall into four practical categories: laser sights, foregrips, bipods, and underbarrel shotguns, plus a few cosmetic-only placeholders. For a broader view of how underbarrel choices interact with the rest of the gun, the TTK Testing muzzle attachments guide covers stacking rules and trade-offs across all four slots.
Underbarrel Slot Comparison
| Underbarrel | Primary Effect | ADS Penalty | Movement Penalty | Best Weapon Match |
|---|---|---|---|---|
| Laser Sight | Strong hipfire accuracy boost | None | None | SMG, shotgun-style builds |
| Foregrip (Vertical) | Vertical recoil reduction | Minor | Minor | AR, LMG |
| Foregrip (Angled) | Horizontal recoil reduction | Minor | Minor | DMR, battle rifle |
| Bipod | Recoil elimination when deployed | None while stowed | None while stowed | DMR, sniper on open lanes |
| Underbarrel Shotgun | Secondary close-range shell | High | None | Breacher-style AR loadouts |
The bipod is the strongest single attachment in the slot when the map geometry supports it. Deployed on a windowsill or low wall, it eliminates nearly all recoil on DMRs and sniper rifles, and while stowed it carries zero ADS or movement penalty. The catch is that you have to commit to a position to get value, so bipod-heavy builds are map-dependent.
When Each Underbarrel Wins
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SMG players: Laser sight. SMGs spend a lot of fights at hipfire range, and the accuracy boost is the single biggest hipfire DPS upgrade in the game.
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AR players: Foregrip, matched to the recoil axis you can't control with your grip slot. If your grip handles horizontal kick, the underbarrel foregrip should clean up vertical, and vice versa.
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DMR players on open maps: Bipod. The bipod-sniper-DMR combination is the highest theoretical accuracy setup in V0.09, and it scales with map knowledge.
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Breacher-style AR loadouts: Underbarrel shotgun. The 12-gauge shell gives AR players a panic-button for close-range corners without forcing a weapon swap.
Stack rules apply here too. A laser sight with an ergonomic grip is a clean hipfire build, but a bipod with a vertical grip and a muzzle brake is a defensive long-range build — the two archetypes don't mix well, so pick a lane and commit.
Building a Full Loadout: Stacking Rules and Common Mistakes
Knowing each slot individually is only half the work. The gunsmith system in TTK Testing applies stacking rules that multiply or cancel certain bonuses when you combine pieces. Community testing reported by players on the developer DevForum shows three rules that hold up across most weapon classes in V0.09.
Stacking Rules Table
| Rule | Effect | Implication |
|---|---|---|
| Recoil bonuses stack up to a soft cap | Diminishing returns past ~60% total reduction | Don't double-stack the same recoil axis |
| ADS penalties stack additively | Two minor penalties can equal one major penalty | Watch for grip + muzzle + underbarrel ADS hits |
| Movement penalties stack additively | Heavy grips + heavy muzzles slow you noticeably | Sniper builds with full stability pay a sprint tax |
| Bipod is a position-locked bonus | Recoil elimination only when deployed | Don't pick it for mobile playstyles |
The most common build mistake new players make is stacking two recoil-control pieces on the same axis. A vertical grip plus a compensator on an AR sounds powerful, but the second piece is working with diminishing returns, while both add an ADS penalty. Most competitive AR builds drop the compensator entirely and let the grip handle the kick, or keep the compensator and swap to an angled grip.
Sample Loadout Builds
| Build Name | Weapon | Optics | Grip | Muzzle | Underbarrel | Best Map Type |
|---|---|---|---|---|---|---|
| CQB Sweeper | SMG | Red Dot | Stubby | Suppressor | Laser Sight | Tight indoor maps |
| Mid-Range AR | AR | Holographic | Vertical | Compensator | Foregrip (Angled) | Mixed lanes |
| Long-Range DMR | DMR | ACOG | Angled | Muzzle Brake | Bipod | Open sightline maps |
| Sniper Anchor | Sniper | Variable Scope | Ergonomic | Suppressor | Bipod | Defensive hold angles |
The "Sniper Anchor" build is worth a closer look. With the V0.09 gunsmith, pairing a variable scope, an ergonomic grip, a suppressor for sound signature, and a bipod for deployed accuracy turns the sniper rifle into a fixed-position laser. The mobility cost is real, but the trade-off is one of the strongest defensive setups the live build currently allows. Players who prefer to hold angles and punish cross-map peeks tend to favor this archetype over mobile sniper runs.
Frequently Asked Questions
What are the four attachment slots in TTK Testing?
Every weapon in the V0.09 gunsmith has four attachment slots: Optics, Grips, Muzzle, and Underbarrel. Each slot accepts a filtered pool of compatible pieces based on weapon class, and the slots work as a system where stacking rules apply to recoil, ADS speed, and movement penalties.
Which optic should I use for an AR or DMR?
For close-to-mid range, a holographic sight gives the fastest target acquisition. For engagements past 50 m, a TTK Testing ACOG is the most competitive pick because the 4x chevron matches the velocity of 7.62-class DMR and battle rifle rounds, and it works well with the Transparent Optics setting for both-eyes-open aiming.
Do vertical grips and compensators stack?
They stack, but with diminishing returns on the same recoil axis. If your grip is already handling vertical kick, swapping the compensator for a muzzle brake or suppressor usually gives better net performance because the second recoil piece adds an ADS penalty without much additional kick reduction.
Is the bipod worth using on a DMR?
The bipod is the strongest attachment in the underbarrel slot for DMRs and sniper rifles on open maps, because it nearly eliminates recoil when deployed and carries zero penalty while stowed. The trade-off is that you must commit to a position, so it loses value on mobile playstyles or in tight corridors.
Can I unlock every TTK Testing attachment for free?
Yes, every gunsmith attachment is unlocked through in-game challenges tied to weapon class mastery, according to the developer DevForum thread. There is no paid attachment tier as of the V0.09 build, and the roadmap described on the official page keeps Gunsmith progression tied to gameplay milestones rather than microtransactions.