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FailZero Part Bolt Assembly, Nickel - EXO-BOLTASSEMBLY01

FailZero Part Bolt Assembly, Nickel - EXO-BOLTASSEMBLY01 - Bolt Carrier Group for AR-15 - view 1
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FailZero

Overview

The FailZero Bolt Assembly is designed specifically for the 5.56 NATO caliber, providing a robust and reliable component for your AR-15 build. Its Nickel Boron finish enhances durability and reduces friction, which can improve overall cycling and ease of maintenance. This bolt assembly frequently appears in builds utilizing a carbine gas system, particularly those chambered in .223 Remington.

Specifications

MPNEXO-BOLTASSEMBLY01
Caliber5.56 NATO
FinishNickel Boron

Available Merchants(5)

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BattleHawk Armory logo
BattleHawk Armory
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$73
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KY Gun Company logo
KY Gun Company
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$81
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Palmetto State Armory logo
Palmetto State Armory
$9.99 shipping (free over $99)
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$87
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Ammunition Depot
~$28.90 est. shipping
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$88
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Optics Planet
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$90
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Build history on GunPartPicker

Builders on GunPartPicker first added the FailZero Part Bolt Assembly, Nickel - EXO-BOLTASSEMBLY01 to a build in March 2026.

It was hard to find in August 2026, in stock on only 12 of the 21 days we checked, and today all 5 retailers we track have it in stock. It dipped to $73.41 at BattleHawk Armory for a stretch in August 2026, under its usual $76.94 to $88.49, so sales do come around. Buying today, the lowest price is $73.41 at BattleHawk Armory, which matches the best price we saw in August.

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Frequently Built With

The part most often added in each category by the 3 builds that include this one

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Aero Precision M4E1 Pistol Complete Lower Receiver w/ MOE-K2 Grip & SBA4 Brace - Anodized/Black

Aero Precision M4E1 Pistol Complete Lower Receiver w/ MOE-K2 Grip & SBA4 Brace - Anodized/Black

Lower Receiver$75 · out of stockin 1 build
ODIN Works Diverge Extended AR-15 Charging Handle - Black

ODIN Works Diverge Extended AR-15 Charging Handle - Black

Charging Handle$24in 1 build
Luth-AR Mba-5 Buttstock & Chubby Grip Black

Luth-AR Mba-5 Buttstock & Chubby Grip Black

Stock & Brace$66in 1 build
Magpul M-LOK AFG Angled Foregrip - Black

Magpul M-LOK AFG Angled Foregrip - Black

Foregrip$16in 1 build
PSA 7" Nitride 1:7 Pistol Length 5.56 NATO Marauder AR-15 Upper Assembly, Black - No BCG/CH

PSA 7" Nitride 1:7 Pistol Length 5.56 NATO Marauder AR-15 Upper Assembly, Black - No BCG/CH

Upper Receiver$200in 1 build

Builds Featuring This Part

See all 1 →

Builds in the community that include the FailZero Part Bolt Assembly, Nickel - EXO-BOLTASSEMBLY01

BuildPartsTotal
for home defense 16" build
for home defense 16"		24$1060.40

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