Phase 5 Weapon Systems

Phase 5 FATman 5/8-24 Hex Muzzle Brake, .308 Win/7.62x51mm/.300 Blackout, Parkerized Black - FATman-5/8-24

Phase 5 Weapon Systems Phase 5 FATman 5/8-24 Hex Muzzle Brake, .308 Win/7.62x51mm/.300 Blackout, Parkerized Black - FATman-5/8-24 - Muzzle Device for AR-15 - view 1
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Phase 5 Weapon Systems

Overview

The Phase 5 FATman Muzzle Brake is designed for .300 Blackout builds, featuring a 5/8x24 thread pitch that allows for easy installation on compatible barrels. This muzzle brake effectively reduces recoil and muzzle rise, making it a great choice for maintaining control during rapid fire. You’ll commonly find this component in carbine gas system setups, enhancing performance and accuracy for your .300 Blackout rifle.

Specifications

MPNFATMAN5/8
Caliber300 Blackout
TypeMuzzle Brake
FinishPhosphate
ColorBlack
Thread Pitch5/8x24
Muzzle Device TypeMuzzle Brake

Available Merchants(4)

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Palmetto State Armory logo
Palmetto State Armory
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$120.00
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Optics Planet
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$120.00
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BattleHawk Armory
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$120.00
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Ammunition Depot
~$28.90 est. shipping
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$120.00
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Build history on GunPartPicker

Availability is good: it was in stock at one retailer or another nearly every time we checked in October 2026, and today 3 of the 4 retailers we track have it in stock. Prices barely moved in October 2026, holding around $120, with no real sale all month. Buying today, the lowest price is $120 at Palmetto State Armory, which matches the best price we saw in October.

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Check it against the live catalog:

Frequently Built With

The part most often added in each category by the builds that include this one

Phase 5 Tactical AR-15 Pistol Pigtail Gas Tube

Phase 5 Tactical AR-15 Pistol Pigtail Gas Tube

Gas Tube$65in 33% of them
Geissele Super Dynamic Combat (SD-C) Trigger

Geissele Super Dynamic Combat (SD-C) Trigger

Trigger$250 · out of stockin 33% of them
Breek Arms AR-15 Warhammer MOD2 Ambidextrous Charging Handle Black

Breek Arms AR-15 Warhammer MOD2 Ambidextrous Charging Handle Black

Charging Handle$45in 33% of them
Geissele Automatics Super Modular MK8 AR-15 Handguard M-LOK - Desert Dirt - 9.3"

Geissele Automatics Super Modular MK8 AR-15 Handguard M-LOK - Desert Dirt - 9.3"

Handguard$306in 33% of them
Brownells AR-15 Semi Auto Chrome Bolt Carrier Group No Serrations

Brownells AR-15 Semi Auto Chrome Bolt Carrier Group No Serrations

Bolt Carrier Groupin 33% of them
Rosco Manufacturing Bloodline 300 Blackout AR-15 Barrel Heavy Pistol - 8.2"

Rosco Manufacturing Bloodline 300 Blackout AR-15 Barrel Heavy Pistol - 8.2"

Barrel$110 · out of stockin 33% of them

Builds Featuring This Part

See all builds →

Builds in the community that include the Phase 5 FATman 5/8-24 Hex Muzzle Brake, .308 Win/7.62x51mm/.300 Blackout, Parkerized Black - FATman-5/8-24

BuildPartsTotal
LMT 8.2" 300 Blackout build
LMT 8.2" 300 Blackout		14$3577.19
aero precision 30" build
aero precision 30"		31$2973.46
16" spike's tactical SBR build
16" spike's tactical SBR		32$2740.21

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