15.3" Weaver-2R Barrel
Barrel
Unlocked at Weapon Level 21.
Short barrel: faster aiming and movement, shorter damage range.
Weapons / Assault Rifle
Close range at LV 42: 5 of 5 final

Waiting for a verified source.
The official patch notes haven't changed this weapon yet.
We have ready builds for the MK35 ISR: close range, long range. Pick a style and your weapon level in the lab above and we equip the right parts for that level, with stand-ins until the parts unlock.
The MK35 ISR maxes out at weapon level 42. After that you can enter weapon prestige and unlock its prestige attachment.
We list 46 compatible attachments for the MK35 ISR across 8 slots, each with its unlock level and what it does.
The prestige attachment is the 19” MFS Nightfall Suppressed Barrel. It unlocks after you reach max level and enter weapon prestige.
In the same class: AK-27, AN-94, Axion. Each has its own page with level-by-level builds.
Barrel
Unlocked at Weapon Level 21.
Short barrel: faster aiming and movement, shorter damage range.
Barrel
Unlocked at Weapon Level 14.
Damage barrel: more damage per hit, more recoil.
Barrel
Unlocked at Weapon Level 9.
Velocity barrel: faster bullets for long fights.
Barrel
Unlocked at Weapon Level 35.
Hybrid barrel: faster bullets and more range, slightly slower aiming.
Barrel
Unlocked at Weapon Level 4.
Long barrel: longer damage range, slower aiming.

SPECIAL CODE
Barrel
Prestige
No verified effect summary is published for this attachment.
Exact image unavailable — Laser
SPECIAL CODE category presentation — not the exact attachment geometry.
Laser
Unlocked at Weapon Level 17.
Handling laser: faster aiming and sprint-to-fire (visible laser).
Exact image unavailable — Laser
SPECIAL CODE category presentation — not the exact attachment geometry.
Laser
Unlocked at Weapon Level 22.
Tactical laser: faster aiming in tactical stance (visible laser).
Exact image unavailable — Laser
SPECIAL CODE category presentation — not the exact attachment geometry.
Laser
Unlocked at Weapon Level 33.
Steady laser: steadier aim while aiming down sights.
Exact image unavailable — Fire Mods
SPECIAL CODE category presentation — not the exact attachment geometry.
Fire Mods
Unlocked at Weapon Level 28.
FMJ rounds: bullet velocity and range.
Exact image unavailable — Fire Mods
SPECIAL CODE category presentation — not the exact attachment geometry.
Fire Mods
Unlocked at Weapon Level 43.
High-velocity ammo: faster bullets and more range.
Exact image unavailable — Laser
SPECIAL CODE category presentation — not the exact attachment geometry.
Laser
Unlocked at Weapon Level 10.
Steady laser: steadier aim while aiming down sights.
Underbarrel
Unlocked at Weapon Level 15.
Recoil foregrip: less recoil.
Exact image unavailable — Fire Mods
SPECIAL CODE category presentation — not the exact attachment geometry.
Fire Mods
Unlocked at Weapon Level 19.
Rapid fire: faster fire rate, less range.
Exact image unavailable — Magazine
SPECIAL CODE category presentation — not the exact attachment geometry.
Magazine
Unlocked at Weapon Level 29.
Extended mag: more ammo per magazine, slower handling.
Exact image unavailable — Stock
SPECIAL CODE category presentation — not the exact attachment geometry.
Stock
Unlocked at Weapon Level 38.
Aim-walk stock: faster movement while aiming.
Exact image unavailable — Fire Mods
SPECIAL CODE category presentation — not the exact attachment geometry.
Fire Mods
Unlocked at Weapon Level 30.
Recoil springs: less recoil.
Exact image unavailable — Laser
SPECIAL CODE category presentation — not the exact attachment geometry.
Laser
Unlocked at Weapon Level 2.
Steady laser: steadier aim while aiming down sights.
Exact image unavailable — Stock
SPECIAL CODE category presentation — not the exact attachment geometry.
Stock
Unlocked at Weapon Level 12.
Mobility stock: faster movement and sprint.
Exact image unavailable — Stock
SPECIAL CODE category presentation — not the exact attachment geometry.
Stock
Unlocked at Weapon Level 26.
Tactical stock: better hip-fire and tactical-stance accuracy.
Underbarrel
Unlocked at Weapon Level 23.
Steady foregrip: steadier aim and less sway.
Underbarrel
Unlocked at Weapon Level 37.
Mobile recoil foregrip: faster movement with some recoil control.
Exact image unavailable — Stock
SPECIAL CODE category presentation — not the exact attachment geometry.
Stock
Unlocked at Weapon Level 31.
Control stock: less recoil, slower handling.
Exact image unavailable — Magazine
SPECIAL CODE category presentation — not the exact attachment geometry.
Magazine
Unlocked at Weapon Level 13.
Extended mag: more ammo per magazine, slower handling.
Exact image unavailable — Stock
SPECIAL CODE category presentation — not the exact attachment geometry.
Stock
Unlocked at Weapon Level 8.
Control stock: less recoil, slower handling.
Underbarrel
Unlocked at Weapon Level 5.
Steady foregrip: steadier aim and less sway.
Exact image unavailable — Magazine
SPECIAL CODE category presentation — not the exact attachment geometry.
Magazine
Unlocked at Weapon Level 6.
Fast mag: faster reload.

SPECIAL CODE
Muzzle
Unlocked from the Season 4 Battle Pass.
No verified effect summary is published for this attachment.
Underbarrel
Unlocked at Weapon Level 40.
No verified effect summary is published for this attachment.
Underbarrel
Unlocked at Weapon Level 32.
No verified effect summary is published for this attachment.
Underbarrel
Unlocked at Weapon Level 11.
No verified effect summary is published for this attachment.
Underbarrel
Unlocked at Weapon Level 27.
No verified effect summary is published for this attachment.
Exact image unavailable — Muzzle
SPECIAL CODE category presentation — not the exact attachment geometry.
Muzzle
Unlocked at Weapon Level 39.
Firepower suppressor: off the minimap, faster bullets and more range, slower aiming.
Exact image unavailable — Rear Grip
SPECIAL CODE category presentation — not the exact attachment geometry.
Rear Grip
Unlocked at Weapon Level 18.
Stabilization grip: less horizontal recoil, slightly slower aiming.
Exact image unavailable — Muzzle
SPECIAL CODE category presentation — not the exact attachment geometry.
Muzzle
Unlocked at Weapon Level 16.
Compensator: less vertical recoil.

SPECIAL CODE
Muzzle
Unlocked via Weekly Challenge Reward.
Recoil suppressor: off the minimap with less recoil.
Exact image unavailable — Muzzle
SPECIAL CODE category presentation — not the exact attachment geometry.
Muzzle
Unlocked at Weapon Level 23.
Muzzle brake: less gun kick and vertical recoil.
Exact image unavailable — Rear Grip
SPECIAL CODE category presentation — not the exact attachment geometry.
Rear Grip
Unlocked at Weapon Level 25.
Quickdraw grip: faster aim-down-sights.
Exact image unavailable — Rear Grip
SPECIAL CODE category presentation — not the exact attachment geometry.
Rear Grip
Unlocked at Weapon Level 7.
Sprint-to-fire grip: shoot sooner after sprinting.
Exact image unavailable — Magazine
SPECIAL CODE category presentation — not the exact attachment geometry.
Magazine
Unlocked at Weapon Level 20.
Flip mag: more ammo and faster reloads.
Underbarrel
Unlocked at Weapon Level 42.
Mobility foregrip: faster movement.
Exact image unavailable — Muzzle
SPECIAL CODE category presentation — not the exact attachment geometry.
Muzzle
Unlocked at Weapon Level 34.
Mobility muzzle: better hip-fire and movement speed.
Exact image unavailable — Muzzle
SPECIAL CODE category presentation — not the exact attachment geometry.
Muzzle
Unlocked at Weapon Level 3.
Suppressor: keeps your shots off the minimap.

SPECIAL CODE
Underbarrel
Unlocked via Weekly Challenge Reward.
No verified effect summary is published for this attachment.
Exact image unavailable — Rear Grip
SPECIAL CODE category presentation — not the exact attachment geometry.
Rear Grip
Unlocked at Weapon Level 41.
Accuracy grip: less vertical recoil.
Exact image unavailable — Rear Grip
SPECIAL CODE category presentation — not the exact attachment geometry.
Rear Grip
Unlocked at Weapon Level 36.
Quickdraw grip: faster aim-down-sights.