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Questions & Answers
Would this fit the Sig Tread M400 5.56? Expert Answer

Yes, the 2A Armament Builder Series Mlok Handguard is compatible with your Sig M400 Tread. You will need to use the included barrel nut and hardware to install.

by Ethan, Gear Expert, February 17, 2023
What is the max height gas block that will fit under this handguard? I am looking to install an Adams Arms P Series Adjustable Micro Block. Expert Answer

The internal diameter of this handguard is only 1.35"

by Tom B, Gear Expert, October 11, 2021
Customer Reviews
Helpful Positive Review
2A Armament Builders Series 12" Handguard by DustyDinero, October 3, 2020
I recently lucked up and caught matching Palouse receiver set on 2A Armament's Builders Series, so I jumped on it. My next move was to find the handguard, since they were sold out of 12" handguards that are a part of 2A's Builders Series. Therefore, ...
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2/2 found this helpful
Read 1 Review
Color:
Black
Finish:
Anodized
Fabric/Material:
6061 Aluminum
Gun Make:
AR Platform
Gun Model:
AR-15
Gun Type:
Rifle
Handguard Length:
15 in
Handguard Type:
Free-Float
Gun Rail:
M-LOK
Weight:
10.9 oz
Condition:
New
Included Accessories:
Aluminum barrel nut and mounting screws
Inner Diameter:
1.35 in
Mount Type:
M-LOK

Code: 2CU-HZ-DSDB-2A-BSHG-15

MPN: 2A-BSHG-15

UPC: 854299007888

Product No Longer Available

Product Info for 2A Armament Builder Series M-Lok Handguard

The Builder Series offers a vast number of 2A Armament components that have been made with the AR builder in mind. The Builder Series offers high quality products at a competitive price .image

This rail features a newly designed 6061 Aluminum hard anodized barrel nut and a rugged mounting system. It also has integrated QD mounts in both the front and rear. This rail features the same Type III, Class 2 hard coat anodizing as the rest of our products that have a durable and aesthetically pleasing finish.

Features of 2A Armament Builder Series Mlok Handguard

  • Certified 6061 Extrusion
  • Aluminum Barrel Nut
  • M-LOK
  • Hardcoat black anodize
  • Freefloat design
  • Front and Rear QD Mounts
  • 1.35" Internal Diameter
  • 1 5/16" crows foot or armorers wrench required for installation
  • Lifetime Warranty

Package Contents:

  • 2A Armament Builder Series M-Lok Handguard

Gun Parts and Accessories

130 / 30
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Gunsmithing Tools & Accessories

115 / 15
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Gun Triggers

115 / 15
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Magazine and Accessories

121 / 21
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Gun Sights

119 / 19
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Gun Stocks

117 / 17
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Mounts, Rings and Accessories

119 / 19
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Related Products to 2A Armament Builder Series M-Lok Handguard

2A Armament Builder Series M-Lok Handguard Unavailable & Discontinued Models

List of Unorderable Models

  • 2A Armament Builder Series M-Lok Handguard, AR-15, 15in, Black, 2A-BSHG-15 , MPN: 2A-BSHG-15 , UPC: 854299007888 , Code: 2CU-HZ-DSDB-2A-BSHG-15
  • 2A Armament Builder Series M-Lok Handguard, AR-15, 7in, Black, A-BSHG-7-1 , MPN: A-BSHG-7-1 , UPC: 854299007857 , Code: 2CU-HZ-DSDB-A-BSHG-7-1
  • 2A Armament Builder Series 7in Mlok AR15 Handguard, Black, Small, 2A-BSHG-7 , MPN: 2A-BSHG-7 , UPC: 854299007857 , Code: 2CU-HZ-DSDB-2A-BSHG-7
  • USED 2A Armament Builder Series 12in Mlok AR15 Handguard, Black, Small, 2A-BSHG-12, EDEMO2, Condition Parts Only/Salvage, Defective , MPN: 2A-BSHG-12-EDEMO2 , Code: 2CU-HZ-DSDB-2A-BSHG-12-EDEMO-DF-F
  • 2A Armament Builder Series M-Lok Handguard, AR-15, 10in, Black, 2A-BSHG-10 , MPN: 2A-BSHG-10 , UPC: 854299007864 , Code: 2CU-HZ-DSDB-2A-BSHG-10
  • 2A Armament Builder Series M-Lok Handguard, AR-15, 12in, Black, 2A-BSHG-12 , MPN: 2A-BSHG-12 , UPC: 854299007871 , Code: 2CU-HZ-DSDB-2A-BSHG-12
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Last updated 2026-08-26 UTC.