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Mk 15 Mod 0

Mk 15 Mod 0
Category
Sniper Rifle
Barrel
736 mm
Weight, empty
12.25 kg
Introduced
2003

About

What it is, and why it matters

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The Mk 15 Mod 0 is the United States Navy designation for the McMillan TAC-50 long-range anti-materiel and sniper rifle, adopted primarily by Navy SEALs for extreme-distance precision engagement and hard-target interdiction. Chambered in .50 BMG, the bolt-action TAC-50 features a fluted match-grade stainless steel barrel, effective muzzle brake, and McMillan's signature fiberglass stock designed to withstand the most extreme environmental conditions. Unlike the semi-automatic Barrett M82/M107 that serves as the US military's primary .50 caliber platform, the Mk 15's manually operated bolt action delivers superior inherent accuracy at the cost of rate of fire, making it the preferred choice for SEAL snipers engaged in precision long-range work where first-round hits are critical. The rifle holds the record for the longest confirmed sniper kills in history through its Canadian military designation, the C15 LRSW.

The TAC-50 holds three of the top five longest confirmed sniper kills in history, all achieved by Canadian snipers. In June 2017, a Canadian JTF2 sniper in Iraq shattered the world record with a confirmed kill at 3,540 meters -- a shot that took approximately 10 seconds of flight time. Previously, Canadian Corporal Rob Furlong set the record at 2,430 meters in Afghanistan in 2002 using the same weapon system. The rifle's bolt-action precision makes it the weapon of choice when a single shot must connect at distances where even a .338 Lapua Magnum runs out of energy.

The Mk 15 Mod 0 designation is frequently confused with the Barrett M82/M107, but they are entirely different weapon systems. The Barrett serves the anti-materiel role with its semi-automatic action, while the Mk 15/TAC-50 is optimized for precision at extreme range. The Canadian military designation is C15 Long Range Sniper Weapon (LRSW). The rifle's effective muzzle brake reduces felt recoil by approximately 50%, making the .50 BMG manageable from a prone position. The TAC-50 uses a manually operated rotary bolt action with dual front-locking lugs. McMillan's fiberglass stocks are legendary for maintaining zero in extreme temperature swings, humidity, and physical abuse that would warp wood or deform polymer alternatives.

Specification

Everything measured

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IdentityWhat it is, who built it and when.

Manufacturer
McMillan Firearms
Category
Sniper Rifle
Country
United States
Status
In production
Produced
2003

DimensionsAs issued, without a magazine or an optic.

Barrel
736 mm
Overall length
1448 mm
Weight, empty
12.25 kg
Weight, loaded
12.90 kg

ActionHow it cycles, what trips it, and what feeds it.

Action
Bolt action
Firing mechanism
Striker fired
Trigger
Single stage
Trigger pull
22.0 N
Capacity
5
Magazine
Detachable box

MaterialsEach swatch is the material itself, not a colour chosen to stand for it.

Frame
Stainless steel
Barrel
Match grade stainless steel
Stock
Fiberglass
Finish
Matte black

BallisticsFrom the service cartridge, not a handload.

Muzzle velocity
928 m/s
Muzzle energy
18084 J
Effective range
1800 m
Maximum range
6800 m

Trajectory

What the round does downrange

Solved from the muzzle figures and the bullet. The dashed rule is the effective range on the record, and the crosses are the steps the solver returned.

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0 m841 m/s

0225450675900518 m0501002003004005006008001000

Features

What it has

What the record lists as fitted, drawn from the catalogue.

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  • Free floating barrel
  • Fluted barrel
  • Match grade barrel
  • Muzzle brake
  • Adjustable stock
  • Bipod mount
  • Picatinny rail
  • Anti materiel capability

Standing

How it compares

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Each figure against the firearms of the same type and cartridge that record it, or of the same type where that cartridge has too few. Positions are read to the nearest tenth.

MeasurementThis firearmMedianPosition
Empty weightAmong 31 12.7x99mm NATO sniper rifles12.25 kg12.43 kgNear the median
Overall lengthAmong 31 12.7x99mm NATO sniper rifles1448 mm1384 mmLonger than about 70%
Barrel lengthAmong 31 12.7x99mm NATO sniper rifles736 mm737 mmShorter than about 70%
Magazine capacityAmong 31 12.7x99mm NATO sniper rifles55Near the median

Answers

Questions about the Mk 15 Mod 0

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How much does the Mk 15 Mod 0 weigh?

The Mk 15 Mod 0 weighs 12.25 kg (27.00 lb) empty and 12.90 kg (28.44 lb) loaded.

What caliber is the Mk 15 Mod 0?

The Mk 15 Mod 0 is chambered in .50 BMG.

How many rounds does the Mk 15 Mod 0 hold?

The Mk 15 Mod 0 holds 5 rounds, fed from a detachable box magazine.

How long is the Mk 15 Mod 0?

The Mk 15 Mod 0 is 1448 mm (57.0 in) long overall, with a 736 mm (29.0 in) barrel.

Who makes the Mk 15 Mod 0?

The Mk 15 Mod 0 is made by McMillan Firearms (United States). It was designed by Gale McMillan.

When was the Mk 15 Mod 0 introduced?

The Mk 15 Mod 0 was introduced in 2003.

How does the Mk 15 Mod 0 operate?

The Mk 15 Mod 0 uses a bolt action, and its firing mechanism is striker fired.

Compatibility

Which parts fit this firearm

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Studio

Every part that mounts on this, resolved

Not a list the maker typed out: the answer comes from the mounts this firearm exposes and the interface each part needs, so it stays right when either one changes.

  • Every part that mounts on any firearm in the catalogue
  • Interface standards, platforms and fit overrides
  • The same answers through the API and the MCP server

Requires a signed-in GunSpec account on the Studio plan. The answer is computed per part, so it is not part of the public record.

Provenance

What the record holds

Every figure above was taken from one of these pages. The confidence reflects how much of the record came from a page a claim can be checked against.

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In service

United States Navy SEALs
2003
United States Special Operations Command
2003
Canadian Armed Forces
2000
Israeli Defense Forces
Israel
Turkish Armed Forces
Türkiye
Georgian Armed Forces
Georgia

Provenance

Stockists

Where to buy

Offers link straight to the shop. GunSpec never takes the order.

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No shop has listed this firearm yet

Stock and prices come from the shops themselves. If you sell this firearm, you can list it and it appears here.

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MCP

Ask an assistant about it

The same record, reached the way a person asks for it rather than the way a program does.

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Ask GunSpec

Works with

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Point an MCP client at GunSpec and it answers from the catalogue rather than from memory. A free key covers the read tools.

API

The call that returns this record

The same fields, in the same units, from the same endpoint the page reads.

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curl --request GET \  --url 'https://api.gunspec.io/v1/firearms/mk15-mod0' \  --header 'X-API-Key: your_key'
Response
{  "id": "mk15-mod0",  "name": "Mk 15 Mod 0",  "manufacturer": {    "id": "mcmillan",    "name": "McMillan Firearms",    "countryCode": "US",    "foundedYear": 2007,    "website": "https://www.mcmillanfirearms.com",    "logoUrl": null,    "description": "US-based tactical rifle manufacturer founded in 2007 by Gale and Ryan McMillan. Known for precision bolt-action rifles and the world-renowned McMillan Tac-50. Has legacy in stock manufacturing dating back to 1973. Purchased by Strategic Armory Corps in 2013.",    "status": "active",    "defunctYear": null,    "stateOwned": null,    "makesFirearms": true,    "parentId": null,    "predecessorId": null,    "createdAt": "2026-02-11 23:44:38",    "updatedAt": "2026-02-18 03:40:45",    "version": "2cc15a49fc15c948861751ba2f5e1320fa33771b0a3e726a11923e32a1335627"  },  "category": {    "id": "sniper-rifle",    "name": "Sniper Rifle",    "description": "Precision rifles optimized for long-range accuracy"  },  "country_of_origin": "US",  "year_introduced": 2003,  "barrel_length_mm": 736,  "weight_empty_g": 12247,  "action_type": "bolt_action"}