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Breek Arms Plan B Sentinel Closed Flash Hider

Breek Arms Plan B Sentinel Closed Flash Hider, .223 Remington/5.56x45mm NATO, 1/2x28, Nitride, Black, BRK4420
Breek Arms Plan B Sentinel Closed Flash Hider, .223 Remington/5.56x45mm NATO, 1/2x28, Nitride, Black, BRK4420
Breek Arms Plan B Sentinel Closed Flash Hider, .223 Remington/5.56x45mm NATO, 1/2x28, Nitride, Black, BRK4420
Breek Arms Plan B Sentinel Closed Flash Hider, .223 Remington/5.56x45mm NATO, 1/2x28, Nitride, Black, BRK4420
1 of 3 images
Breek Arms Plan B Sentinel Closed Flash Hider, .223 Remington/5.56x45mm NATO, 1/2x28, Nitride, Black, BRK4420
Breek Arms Plan B Sentinel Closed Flash Hider, .223 Remington/5.56x45mm NATO, 1/2x28, Nitride, Black, BRK4420
2 of 3 images
Breek Arms Plan B Sentinel Closed Flash Hider, .223 Remington/5.56x45mm NATO, 1/2x28, Nitride, Black, BRK4420
Breek Arms Plan B Sentinel Closed Flash Hider, .223 Remington/5.56x45mm NATO, 1/2x28, Nitride, Black, BRK4420
3 of 3 images
Breek Arms Plan B Sentinel Closed Flash Hider, .223 Remington/5.56x45mm NATO, 1/2x28, Nitride, Black, BRK4420

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Questions & Answers
What is the protrusion depth for suppressor mounting? Manufacturer Answer

The protrusion depth into a suppressor when using our Plan B Hub mount is 1.70 inches.

by Breek Arms, Manufacturer, January 8, 2026
What is the bore size? Big enough for 9mm? Manufacturer Answer

Yes, our flash hiders are big enough for a 9mm, they are bored with a 0.368" drill.

by Breek Arms, Manufacturer, December 31, 2025
View All Q&A You Have a Question? Ask!
Customer Reviews
Expert Review
Quality Flash Hider, Reasonable Price Point by Andrew, Gear Expert, November 6, 2025
Solid and to the point: the Breek Arms Plan B Sentinel is a semi-compact, well-made caged flash hider that’s perfect when you need real flash suppression without stretching your barrel — it’s machined from 4140 hardened steel, nitride finished, runs ...
Read More...
1/2 found this helpful
Most Recent Reviews
Function Design by Daniel, Verified Owner, January 10, 2026
The cage design is great for mitigation of the muzzle flash and having the bottom ports filled prevent the dirt and dust signature when shooting prone still waiting to try the supressor mount with the plan b threads but I have no doubts that will int...
Read More...
0/1 found this helpful
Most Recent Reviews
Breek sentinel by Thumper, Verified Owner, January 21, 2026
Flash hider seemed good I did have to return it and swap it for a shorter one to work with the yhm r9 it did work with my Stacy's mom can but was to long for the r9... Optic planet is supposed to make it right and give me store credit for it so we'll...
Read More...
Most Recent Reviews
works perfect by flex, Verified Owner, December 31, 2025
Seemed like an open box item but the product itself was in like new condition. I onstalled it and no issues. You wont be disappointed you will still need another adapter.
Most Recent Reviews
Top Quality Flash Hider by Tony, November 3, 2025
Purchased this flash hider along with a few others from Breek Arms and I am thoroughly impressed with the quality. The finishing and threads are pristine, and I have had no problems with it so far!
Most Recent Reviews
Quality At A Budget by Echo Delta, October 13, 2025
Very impressed with the quality of machining and overall finish of these new Plan B flash hiders. Absolutely flawless lines with no machining marks, high quality steel, and sharp threads. Couldn't ask for more at this price point.
Read All 7 Reviews
Color:
Black
Caliber:
.223 Remington, 5.56x45mm NATO
Finish:
Nitride
Fabric/Material:
4140 Steel
Threads per Inch:
1/2x28
Length:
2.15 in
Outer Diameter:
1 in
Weight:
2.2 oz
Condition:
Used
Condition Quality:
Excellent
Condition Details:
Inspect And Rebox
Barrel Length:
14.5 in
Last Chance:
Yes

Code: 4TY-BFH-BAMD03-BRK4420-EDEMO-RE-B

MPN: BRK4420-EDEMO

Product No Longer Available

Product Info for Breek Arms Plan B Sentinel Closed Flash Hider

The Sentinel is a closed-tine, fully shrouded design for superior flash suppression and to reduce snagging on gear. Built for Plan B mounts and pin-and-weld builds, it delivers rock-solid alignment, compact length, and NVG-friendly signature reduction.image

Features of Breek Arms Plan B Sentinel Closed Flash Hider

  • Fast attach for Plan B suppressor mounts
  • Engineered to be pinned and welded on 14.5in barrels to meet the 16in Federal minimum length requirement

Package Contents:

  • Breek Arms Plan B Sentinel Closed Flash Hider
  • Peel Washer

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Breek Arms Plan B Sentinel Closed Flash Hider Unavailable & Discontinued Models

List of Unorderable Models

  • USED, Breek Arms Plan B Sentinel Closed Flash Hider, .223 Remington/5.56x45mm NATO, 1/2x28, Nitride, Black, BRK4420 , MPN: BRK4420-EDEMO , Code: 4TY-BFH-BAMD03-BRK4420-EDEMO-RE-B
  • USED, Breek Arms Plan B Sentinel Closed Flash Hider, .30 Carbine, 5/8x24, Nitride, Black, BRK4421 , MPN: BRK4421-EDEMO , Code: 4TY-BFH-BAMD03-BRK4421-EDEMO-IN-D
  • USED, Breek Arms Plan B Sentinel Closed Flash Hider, .223 Remington/5.56x45mm NATO, 1/2x28, Nitride, Black, BRK4420 , MPN: BRK4420-EDEMO , Code: 4TY-BFH-BAMD03-BRK4420-EDEMO-RE-C
  • USED, Breek Arms Plan B Sentinel Closed Flash Hider, .30 Carbine, 5/8x24, Nitride, Black, BRK4421 , MPN: BRK4421-EDEMO , Code: 4TY-BFH-BAMD03-BRK4421-EDEMO-RE-B
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Last updated 2026-08-09 UTC.