D
dereschuk64_53love it
Reviewed on April 17, 2026Verified with Build
ran a 30 round mag dump with no malfunctions. extractor grip is solid
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Diamondback Firearms 5.56 AR-15 Bolt Carrier Group - Nitride
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Diamondback
Overview
The Diamondback Firearms 5.56 AR-15 Bolt Carrier Group features a robust design tailored for reliable performance in 5.56 NATO builds. Its nitride finish enhances durability and corrosion resistance, ensuring smooth operation and longevity under rigorous conditions. This BCG is commonly used in mid-length gas system builds, making it a solid choice for those looking to optimize cycling and reliability in their AR-15 platform.
Specifications
MPNDB15-BCGS
StyleAR-15 Bolt Carrier
Caliber5.56 NATO
FinishNitride
Available Merchants
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August 2026 on GunPartPicker
Diamondback Firearms 5.56 AR-15 Bolt Carrier Group - Nitride ranked #123 of the 229 bolt carrier groups builders added on GunPartPicker in August 2026. Builders have been adding it to their builds on GunPartPicker since March 2026. All time, it ranks #210 of the 432 bolt carrier groups builders have added. Builds with this bolt carrier group are mostly chambered in 5.56 NATO (73%, then .223 Wylde 11%), split between mid-length (51%) and carbine-length (24%) gas systems, and mostly AR-15 (94%).
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Handguard$42in 14 builds
Build Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
PlatformBased on real build data showing which platform (AR-15, AR-10, AR-9) builders pair with this product.
93.9%
AR-1593.9%
AR-106.1%
CaliberBased on real build data showing which calibers builders choose alongside this product.
72.6%
5.56 NATO72.6%
.223 Wylde10.5%
300 Blackout8.4%
.450 Bushmaster5.3%
.223 Remington1.1%
Other2.2%
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
50.6%
Mid-Length50.6%
Carbine23.5%
Rifle16.5%
Pistol9.4%
Builds Featuring This Part
See all 22 →Builds in the community that include the Diamondback Firearms 5.56 Ar-15 Bolt Carrier Group - Nitride
| Build | Parts | Total |
|---|---|---|
 | 18 | $1134.01 |
 | 8 | $519.48 |
 | 5 | $161.50 |
 | 22 | $1762.37 |
 | 14 | $947.71 |
 | 33 | $2922.99 |
| 28 | $3357.58 |
 | 25 | $1233.30 |
 | 21 | $1142.27 |
 | 10 | $448.05 |
| 10 | $1552.22 |
 | 18 | $976.17 |
Customer reviews
4.5out of 5
2 global ratings
Top reviews
E
epark428_556minor gripes
Reviewed on April 13, 2026Verified with Build
good bcg overall. wish the gas key screws came already torqued
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