MDM4 M91T-SureFire Millennium Adapter

Name: Malkoff Devices MDM4 M91T-SureFire Millennium Adapter - MDM4 M91T-SureFire Millennium Adapter
Brand: Malkoff Devices
SKU: 19470589251
Price: 153.99 USD
Availability: InStock
Rating: 4.9863 (71 reviews)

4.5 (1,234)

Sold 100+ last 30 days

20% off first order

$153.99$160.98

4% off

Quantity

Color

Black

Quantity

The Malkoff MDM4 M91T Adapter will fit most Surefire Millennium Series Lights including the M3, M6, M500, M961, M962, M900, and M910. The output is 1000 Lumens with 38K candela and ample spill. This set set up will easily identify targets out to 200+ yards.

The current draw is approximately 1400ma at 9 volts. The full output runtime is a

5.0

73 ratings

Great upgrade for my Surefire

Very nice addition to my Surefire M500A, nice USA made parts, real quality

Stanley · February 19, 2026

Night and day difference

Took one of my old AR’s with the Surefire light handguard. Put a new set of batteries in it and was underwhelmed at its light output. Emailed Gene and he explained my options. I bought the M91T lighthead conversion. Light output exceeded anything I imagined. Excellent!

Dennis · November 9, 2025

Works good

Bright and easy swap

Ira · December 8, 2025

Returns accepted within 30 days

Exclusions may apply. See full policy

Malkoff Devices

5 (4.3K)

Product description loading

This is the product description text that will appear here.

6% off

Malkoff Devices

MDM4 M91B-SureFire Millennium Adapter

(33)

$148.99$158.98

20% off

Malkoff Devices

Maglite 3D Li-ion 2x 18650 Adapter

(9)

$39.99$49.99

One Hundred Concepts

4.8

(4.8K)

HexCap anti-reflection device kill flash scope cover mounted on EOTech XPS holographic sight

ScopeCap Pro scope cover with anti-reflection device on Leupold Mark 5 HD and Trijicon RMR HD top dot

HelmetScrim™ 2.0 - Camo Netting for Helmet - One Hundred Concepts

Malkoff Devices

MD90 Adapter for Surefire MH90 Body

(38)

$31.99

Malkoff Devices

E2T/Scout M600 2CR123 Head

(33)

$119.99

Malkoff Devices

Fitting Ring for Surefire Shock Absorbing Head

(118)

$2.00

JLHawaii808

(716)

Emisar/Noctigon Replacement Glass/Optics

Emisar D3AA Brass 14500/AA LED Flashlight

Vapcell K10 14500 8A 1000mah Lithium-ion battery ***MUST BE SOLD WITH FLASHLIGHT + FEDEX*** FLAT TOP

11% off

Malkoff Devices

MDX-M91B Head

(15)

$109.99$123.98

6% off

Malkoff Devices

MDC 2AA LMH Flashlight

(29)

$159.99$170.98

Malkoff Devices

MDC Lens Kit

(10)

$4.00

Nitecore Store

4.7

(6.7K)

Nitecore EDC29 flashlights shown side by side. The flashlight on the left is olive drab green, and the one on the right is black.

A compact, lightweight, black Nitecore NU20 Classic headlamp with a flexible, cord strap.

Two Nitecore UT27 MCT headlamps - one in white and one in black - and two HLB1500 battery packs on a white background

Image of the NU25 MCT with a black and yellow headband over a white background

10% off

Malkoff Devices

MDX2 M61 Flashlight

(44)

$169.99$187.97

Malkoff Devices

MDX Body Tube Spacer

(3)

$12.00

One Hundred Concepts

Surefire EDC-1 DFT

(1)

$279.00

Battery Junction

4.8

(438)

Evergreen Alkaline 1.5V AAA Batteries - Main Image

Malkoff Devices

MDM4-SureFire Millennium Adapter

(12)

$81.99

Prometheus Lights

4.8

(4.2K)

11% off

Malkoff Devices

MDX-M61HOT V2 Head

$99.99$112.98

Malkoff Devices

MDC 18650 to E-Series Body

(16)

$99.99

5% off

Malkoff Devices

MDX-M91T Throw Head

(23)

$118.99$124.99

CountyComm

4.8

(49.1K)

Malkoff Devices

MDX2 Body

(1)

$51.99

Malkoff Devices

E2 Super/Scout V3 (E2S V3) M600 2CR123 Head

(30)

$134.99

Battery Junction

SureFire M640DF Dual Fuel Scout Light Pro LED Weapon Light - 1500 Lumens - Includes 1 x 18650, MLOK Mount and Z68 Tailcap - Black or Tan

$341.00

TacticalElites

4.4

(5.9K)

Malkoff Devices

E2/Scout M600 2-3 CR123 Head

(78)

$102.99

Malkoff Devices

Hound Dog 18650 XT Cool Head

(11)

$165.99

Malkoff Devices

MDX Crenelated Head

(10)

$59.99

High Speed Gear

4.7

(703)

High Speed Gear One Wrap Belt Mount Kit tactical belt for duty loadout and range setup

Thyrm LLC

4.8

(266)

CellVault XL is compatible with CR123, 18650, and AAA batteries

CellVault original size is compatible with CR123 and AAA batteries

11% off

Malkoff Devices

Forend-2 LED Light to Fit SureFire

(75)

$119.99$134.97

Malkoff Devices

Maglite LED Adapter Universal D&C Size

(33)

$73.99

17% off

Malkoff Devices

M61N, M61NL, and M61NLL Drop-in to fit Surefire

(87)

$51.99$62.99

Modlite Systems

4.9

(3.7K)

8% off

Malkoff Devices

Hound Dog 18650 Flashlight

(23)

$237.99$257.97

5% off

Malkoff Devices

Hound Dog XPL Flashlight

(40)

$249.99$262.97

Malkoff Devices

Dummy CR123 Cell

(8)

$12.99

Fenix Lighting

4.7

(15.6K)

The Fenix HM65R V2.0 headlamp with a black body and dual LED lenses, attached to an elastic strap with black, gray, and orange panels and white Fenix branding.

A black tactical flashlight with a metal clip and textured grip, shown alongside an orange and black 5000mAh rechargeable lithium-ion battery on a plain white background.

Two Fenix Lights. One PD36R ACE with an E12 V3.0 flashlights in black anodized aluminum, both shown on a plain white background.

Malkoff Devices

MDX Tailcap Switch

(39)

$39.99

Malkoff Devices

E1HTV2 - E1 Hyper Throw V2/Scout M300 1CR123 Head

(118)

$124.99

6% off

Malkoff Devices

MDX2 M61T Flashlight

(32)

$171.99$182.97

HCC Tactical

4.9

(1K)

MultiCam; Agilite - Micro Map - HCC Tactical

KA Tech Airsoft

SureFire Flashlight With AXON Dual Function

$85.00

11% off

Malkoff Devices

MDM4 M61-SureFire Millennium Adapter

(41)

$115.99$130.98

15% off

Malkoff Devices

MD951 LED Conversion Kit for the Surefire M951

(8)

$153.99$181.98

17% off

Malkoff Devices

Maglite 2D Li-ion 2x 18650 Adapter

(5)

$49.99$59.99

17% off

Malkoff Devices

M61W, M61WL, and M61WLL Drop-in to fit Surefire

(57)

$51.99$62.99

12% off

Malkoff Devices

MDC E2XTL V3 EZP Flashlight

$249.99$282.98

7% off

Malkoff Devices

MDX2 M61HOT V2 Flashlight

(82)

$177.99$191.97

4% off

Malkoff Devices

MDX4 M91 H/L Switch Flashlight

(1)

$256.99$266.54

8% off

Malkoff Devices

MDX4 Body and Switch

(25)

$88.99$96.98

Malkoff Devices

MDC 1AA LMH Flashlight

(87)

$141.99

Malkoff Devices

MDC 1CR123 Body (Unshrouded)

(22)

$55.99

Malkoff Devices

MDX Head

(23)

$46.99

Malkoff Devices

MDX3 Body

$57.99

Malkoff Devices

MDC Cap/Pocket Clip

(7)

$24.99

AKAG TOY

SureFire M340C LED Metal Flashlight

$43.99

Hike-ready rain jackets

Packable jackets, 3-layer shells, and hoods.

17% off

Malkoff Devices

M31, M31L, and M31W to fit SureFire 3P

(23)

$58.99$70.99

At-home cardio essentials

Folding walking pads, exercise bikes, and free weights.

Bulbstock

Lumens Factory HO-6 High Output Reflector Module (SureFire P60 Replacement) #64010

$20.99

okluma

4.9

(88)

20% off

Malkoff Devices

MDC Headlamp Holder (No Flashlight)

(13)

$20.00$25.00

Cloud Defensive

4.9

(837)

A black Cloud Defensive REIN Micro weapon light with a bezel diameter of 1.3 inches and a body length of 4.88 inches.

FDE Rein Micro flashlight with mount and switch

Malkoff Devices

E2XTV3 and E2XTLV3

(65)

$182.99

Villain Weapon Systems

4.7

(50)

20% off

Malkoff Devices

Holster for All Hound Dog & Wildcat Flashlights

(7)

$19.99$24.99

Fix It Sticks

4.8

(7.1K)

Malkoff Devices

VME Gasket O-Ring Set

(5)

$3.00

SC IRREGULARS

(2.2K)

Malkoff Devices

E2XTL (Red or Green)

(3)

$172.99

15% off

Malkoff Devices

M91B, M91BN, and M91BW Dropin to fit Surefire 9P

(77)

$76.99$90.99

Malkoff Devices

M361-LMH to Fit SureFire

(46)

$69.99

Malkoff Devices

Maglite Glass Lens (Ultra Clear)

(12)

$12.99

Post-workout recovery

Wraps, compression sleeves, and foam rollers.

14% off

Malkoff Devices

M61, M61L, and M61LL Drop-in to fit Surefire

(689)

$48.99$56.99

17% off

Malkoff Devices

MDX2 (MD2) Body and Switch

(40)

$75.99$91.98

Malkoff Devices

MDC 18650 (Surefire Dual Fuel Thread Pattern) Body

(5)

$99.99

Maglite

4.9

(97)

Black Mini Maglite Classic AA flashlight shown at a shallow angle with knurled grip.

Mini Maglite Pro LED flashlight in black with a knurled grip, shown diagonally across a black background.

Mini Maglite replacement Xenon lamp packaging with two bulbs visible on blue card

Mini Maglite LED Flashlight AA with Holster Black

Malkoff Devices

MDC Pocket Clip

(9)

$14.99

8% off

Malkoff Devices

Hound Dog Super Flashlight

(81)

$308.99$336.97

Malkoff Devices

VME Head

(47)

$34.99

Hunter Constantine

4.9

(2.2K)

4% off

Malkoff Devices

Hound Dog 21700 Flashlight

(1)

$249.99$260.98

Malkoff Devices

MDC 2AA Body

(21)

$69.99

5.0

73 ratings

Great upgrade for my Surefire

Very nice addition to my Surefire M500A, nice USA made parts, real quality

Stanley · February 19, 2026

Night and day difference

Dennis · November 9, 2025

Works good

Bright and easy swap

Ira · December 8, 2025

Returns accepted within 30 days

Exclusions may apply. See full policy

Malkoff Devices

5 (4.3K)

MDM4 M91T-SureFire Millennium Adapter

Highlights

Description

Specifications

Reviews5.0(73)

Delivery & Returns

Malkoff Devices

You might also like

MDM4 M91B-SureFire Millennium Adapter

Maglite 3D Li-ion 2x 18650 Adapter

One Hundred Concepts

MD90 Adapter for Surefire MH90 Body

E2T/Scout M600 2CR123 Head

Fitting Ring for Surefire Shock Absorbing Head

JLHawaii808

MDX-M91B Head

MDC 2AA LMH Flashlight

MDC Lens Kit

Nitecore Store

MDX2 M61 Flashlight

MDX Body Tube Spacer

Surefire EDC-1 DFT

Battery Junction

MDM4-SureFire Millennium Adapter

Prometheus Lights

MDX-M61HOT V2 Head

MDC 18650 to E-Series Body

MDX-M91T Throw Head

CountyComm

MDX2 Body

E2 Super/Scout V3 (E2S V3) M600 2CR123 Head

SureFire M640DF Dual Fuel Scout Light Pro LED Weapon Light - 1500 Lumens - Includes 1 x 18650, MLOK Mount and Z68 Tailcap - Black or Tan

TacticalElites

E2/Scout M600 2-3 CR123 Head

Hound Dog 18650 XT Cool Head

MDX Crenelated Head

High Speed Gear

Thyrm LLC

Forend-2 LED Light to Fit SureFire

Maglite LED Adapter Universal D&C Size

M61N, M61NL, and M61NLL Drop-in to fit Surefire

Modlite Systems

Hound Dog 18650 Flashlight

Hound Dog XPL Flashlight

Dummy CR123 Cell

Fenix Lighting

MDX Tailcap Switch

E1HTV2 - E1 Hyper Throw V2/Scout M300 1CR123 Head

MDX2 M61T Flashlight

HCC Tactical

SureFire Flashlight With AXON Dual Function

MDM4 M61-SureFire Millennium Adapter

MD951 LED Conversion Kit for the Surefire M951

Maglite 2D Li-ion 2x 18650 Adapter

M61W, M61WL, and M61WLL Drop-in to fit Surefire

MDC E2XTL V3 EZP Flashlight

MDX2 M61HOT V2 Flashlight

MDX4 M91 H/L Switch Flashlight

MDX4 Body and Switch

MDC 1AA LMH Flashlight

MDC 1CR123 Body (Unshrouded)

MDX Head

MDX3 Body

MDC Cap/Pocket Clip

SureFire M340C LED Metal Flashlight

M31, M31L, and M31W to fit SureFire 3P

Lumens Factory HO-6 High Output Reflector Module (SureFire P60 Replacement) #64010

okluma

MDC Headlamp Holder (No Flashlight)

Cloud Defensive

E2XTV3 and E2XTLV3

Villain Weapon Systems

Holster for All Hound Dog & Wildcat Flashlights

Fix It Sticks

VME Gasket O-Ring Set

SC IRREGULARS

E2XTL (Red or Green)

M91B, M91BN, and M91BW Dropin to fit Surefire 9P

M361-LMH to Fit SureFire

Maglite Glass Lens (Ultra Clear)