Spring Sale - Save 15% On $200+ Orders w/ Code: SPRING15 - SHOP NOW!

Spring Sale - Save 15% On $200+ Orders w/ Code: SPRING15 - SHOP NOW!

3771-KAK-K-Spec-BCGs-CP-Hero-1920x385
3771-KAK-K-Spec-BCGs-CP-Hero-768x450

TIRED OF GETTING A FACEFUL OF BLOWBACK?

KAK K-Spec Down Vent BCG Vents Gasses Away From
The Shooter Perfect For Overgassed & Suppressed Guns

Get Yours
4509 Site Banners - BRN180 Gen-3 Launch_Category Hero
4509 Site Banners - BRN180 Gen-3 Launch_Category Hero Mobile(1)

SEE WHAT YOU'VE
BEEN MISSING

Meet The BRN-180® Gen 3 Uppers
Introduce Me!
4230 Site Banners - Brownells BCG_Dekstop
4230 Site Banners - Brownells BCG_MobileV2

No - They're Not Another
Run-Of-The-Mill BCG

See What Sets The Brownells BCG Apart!
Learn More
3771-KAK-K-Spec-BCGs-CP-Hero-1920x385
3771-KAK-K-Spec-BCGs-CP-Hero-768x450

TIRED OF GETTING A FACEFUL OF BLOWBACK?

KAK K-Spec Down Vent BCG Vents Gasses Away From
The Shooter Perfect For Overgassed & Suppressed Guns

Get Yours
4509 Site Banners - BRN180 Gen-3 Launch_Category Hero
4509 Site Banners - BRN180 Gen-3 Launch_Category Hero Mobile(1)

SEE WHAT YOU'VE
BEEN MISSING

Meet The BRN-180® Gen 3 Uppers
Introduce Me!

Bolt Carrier Groups49 Items

Bolt Carrier Groups Up To 36% Off - 49 Products In Stock / 6 Models

Browse 49 Bolt Carrier Groups from our Rifle Bolts & Bolt Carrier Groups dept including BROWNELLS, KAK INDUSTRY LLC., FAXON FIREARMS, & BROWNELLS BUNDLES Up To 36% Off at Brownells.

Sort by:
Sort
Price (Low to High)
Price (High to Low)
Brand (A to Z)
Brand (Z to A)
Product (A-Z)
Product (Z-A)
Avg. Customer Review
Number of Reviews
On Sale
Made in USA
New Products
49 Results
Products: –of 72
Number of results:
LAW TACTICAL LLC - AR-15 ARIC INTERNAL CARRIERS W/LAW FOLDER LAW TACTICAL LLC - AR-15 ARIC INTERNAL CARRIERS W/LAW FOLDER
5 Stars
(5.0)

$599.99

In stock
ANGSTADT ARMS, LLC - AR-15 9MM BOLT CARRIER GROUP ANGSTADT ARMS, LLC - AR-15 9MM BOLT CARRIER GROUP
5 Stars
(5.0)

$221.99

In stock
KAK INDUSTRY LLC. - K-SPEC M16 5.56 NATO BOLT CARRIER GROUP W/SIDE VENT KAK INDUSTRY LLC. - K-SPEC M16 5.56 NATO BOLT CARRIER GROUP W/SIDE VENT
5 Stars
(5.0)

$179.99 - $219.99

Select Items In Stock
BROWNELLS BUNDLES - M16 BCG & MAGPUL AR-15 PMAG GEN M2 MOE MAGAZINE BUILDER'S BUNDLE BROWNELLS BUNDLES - M16 BCG & MAGPUL AR-15 PMAG GEN M2 MOE MAGAZINE BUILDER'S BUNDLE
5 Stars
(5.0)

$182.99

In stock
STERN DEFENSE, LLC - M16 9MM BOLT FOR GLOCK® AND COLT STERN DEFENSE, LLC - M16 9MM BOLT FOR GLOCK® AND COLT
5 Stars
(5.0)

$129.99 - $169.99

In stock
AERO PRECISION - 5.56MMX45 NATO BOLT CARRIER GROUP FOR AR-15 AERO PRECISION - 5.56MMX45 NATO BOLT CARRIER GROUP FOR AR-15
5 Stars
(5.0)

$149.99 - $154.99

Select Items In Stock
STERN DEFENSE, LLC - AR-15 9MM BOLT FOR GLOCK® AND COLT STERN DEFENSE, LLC - AR-15 9MM BOLT FOR GLOCK® AND COLT
5 Stars
(5.0)

$129.99

In stock
BROWNELLS - AR15 BOLT CARRIER GROUP 5.56X45MM NITRIDE MP BROWNELLS - AR15 BOLT CARRIER GROUP 5.56X45MM NITRIDE MP
5 Stars
(5.0)

$99.99

In stock
Product badgeSTERN DEFENSE, LLC - AR-15 GEN 2 BOLT CARRIER FOR GLOCK® & COLT .40S&W STERN DEFENSE, LLC - AR-15 GEN 2 BOLT CARRIER FOR GLOCK® & COLT .40S&W
5 Stars
(5.0)

$93.82

$142.65

In stock
DANIEL DEFENSE - M16 5.56 BOLT CARRIER GROUP DANIEL DEFENSE - M16 5.56 BOLT CARRIER GROUP
5 Stars
(4.9)
Add to cart to see price

In stock
CMMG - AR-15 ECHO CONVERSION KIT 22LR CMMG - AR-15 ECHO CONVERSION KIT 22LR
5 Stars
(4.8)

$182.99

In stock
BROWNELLS - M16 MIL-SPEC MP BOLT CARRIER GROUP BROWNELLS - M16 MIL-SPEC MP BOLT CARRIER GROUP
5 Stars
(4.7)

$129.99

In stock
BROWNELLS - M16 7.62X39 BOLT CARRIER GROUP NITRIDE MP BROWNELLS - M16 7.62X39 BOLT CARRIER GROUP NITRIDE MP
5 Stars
(4.7)

$114.99

In stock
BROWNELLS - M16 5.56 BOLT CARRIER GROUP NITRIDE MP BROWNELLS - M16 5.56 BOLT CARRIER GROUP NITRIDE MP
5 Stars
(4.6)

$98.99

In stock
CMMG - AR-15/M16 22LR BRAVO CONVERSION KITS CMMG - AR-15/M16 22LR BRAVO CONVERSION KITS
5 Stars
(4.5)

$164.99 - $199.99

In stock
SONS OF LIBERTY GUN WORKS - 5.56X45MM NATO BOLT CARRIER GROUP FOR AR-15 SONS OF LIBERTY GUN WORKS - 5.56X45MM NATO BOLT CARRIER GROUP FOR AR-15
5 Stars
(4.5)
Add to cart to see price

In stock
BROWNELLS - M16 5.56 LIGHTWEIGHT BOLT CARRIER GROUP BROWNELLS - M16 5.56 LIGHTWEIGHT BOLT CARRIER GROUP
5 Stars
(4.4)

$134.99

In stock
LAW TACTICAL LLC - ARIC INTERNAL CARRIERS FOR AR-15 LAW TACTICAL LLC - ARIC INTERNAL CARRIERS FOR AR-15
5 Stars
(4.3)

$396.99 - $419.00

In stock
BRAVO COMPANY - M16 5.56 BOLT CARRIER GROUP BRAVO COMPANY - M16 5.56 BOLT CARRIER GROUP
5 Stars
(4.3)

$184.99 - $218.99

In stock
BROWNELLS - AR-15 BROWNELLS 9MM BOLT CARRIER GROUP BROWNELLS - AR-15 BROWNELLS 9MM BOLT CARRIER GROUP
5 Stars
(4.1)

$169.99

In stock
SPIKES TACTICAL - M16 5.56 NICKEL BORRON BOLT CARRIER GROUP SPIKES TACTICAL - M16 5.56 NICKEL BORRON BOLT CARRIER GROUP
5 Stars
(4.0)

$224.99

In stock
COLT - M16 5.56 BOLT CARRIER GROUP COLT - M16 5.56 BOLT CARRIER GROUP
5 Stars
(4.0)

$211.99

In stock
ODIN WORKS INC. - AR-15 BOLT CARRIER GROUP ODIN WORKS INC. - AR-15 BOLT CARRIER GROUP
5 Stars
(4.0)

$122.99

In stock
FAXON FIREARMS - 6.5 GRENDEL/6MM ARC TYPE 2 BOLT CARRIER GROUP FOR AR-15/M16 FAXON FIREARMS - 6.5 GRENDEL/6MM ARC TYPE 2 BOLT CARRIER GROUP FOR AR-15/M16
5 Stars
(3.6)

$151.80

In stock
BROWNELLS - M16 5.56 BOLT CARRIER GROUP NICKEL BORON MP BROWNELLS - M16 5.56 BOLT CARRIER GROUP NICKEL BORON MP
5 Stars
(3.4)

$134.99

In stock
FAXON FIREARMS - 5.56X45 NATO LIGHTWEIGHT MIL-SPEC BOLT CARRIER GROUP FOR AR15 FAXON FIREARMS - 5.56X45 NATO LIGHTWEIGHT MIL-SPEC BOLT CARRIER GROUP FOR AR15
5 Stars
(3.3)

$229.08 - $275.08

Select Items In Stock
FAXON FIREARMS - 5.56X45MM NATO MIL-SPEC BOLT CARRIER GROUP FOR AR-15/M16 FAXON FIREARMS - 5.56X45MM NATO MIL-SPEC BOLT CARRIER GROUP FOR AR-15/M16
5 Stars
(3.0)

$133.40 - $183.08

In stock
BROWNELLS - AR-15 9MM BOLT ASSEMBLY FOR GLOCK BROWNELLS - AR-15 9MM BOLT ASSEMBLY FOR GLOCK
5 Stars
(2.9)

$108.99

In stock
LMT DEFENSE - ENHANCED BOLT FULL AUTO 5.56MM BOLT CARRIER GROUP LMT DEFENSE - ENHANCED BOLT FULL AUTO 5.56MM BOLT CARRIER GROUP
5 Stars
(0.0)

$440.10

In stock
BROWNELLS BUNDLES - M16 BCG & BALLISTIC ADVANTAGE 16IN BBL BUILDER'S BUNDLE BROWNELLS BUNDLES - M16 BCG & BALLISTIC ADVANTAGE 16IN BBL BUILDER'S BUNDLE
5 Stars
(0.0)

$293.99

In stock
BROWNELLS BUNDLES - M16 BCG & GEISSELE AR-15 ENHANCED TRIGGER BUILDER'S BUNDLE BROWNELLS BUNDLES - M16 BCG & GEISSELE AR-15 ENHANCED TRIGGER BUILDER'S BUNDLE
5 Stars
(0.0)

$267.99 - $280.99

In stock
BROWNELLS BUNDLES - M16 5.56 BCG, CHARGING HANDLE & PMAG GEN M2 MAGAZINE BUNDLE BROWNELLS BUNDLES - M16 5.56 BCG, CHARGING HANDLE & PMAG GEN M2 MAGAZINE BUNDLE
5 Stars
(0.0)

$224.99

In stock
LMT DEFENSE - AR-15 BOLT CARRIER GROUP LMT DEFENSE - AR-15 BOLT CARRIER GROUP
5 Stars
(0.0)

$224.10

Select Items In Stock
KAK INDUSTRY LLC. - K-SPEC M16 .224 VALKYRIE /6.8 SPECIAL BOLT CARRIER GROUP KAK INDUSTRY LLC. - K-SPEC M16 .224 VALKYRIE /6.8 SPECIAL BOLT CARRIER GROUP
5 Stars
(0.0)

$179.99

In stock
KAK INDUSTRY LLC. - K-SPEC M16 7.62X39MM BOLT CARRIER GROUP KAK INDUSTRY LLC. - K-SPEC M16 7.62X39MM BOLT CARRIER GROUP
5 Stars
(0.0)

$179.99

In stock
MIDWEST INDUSTRIES, INC. - AR-15 BOLT CARRIER GROUP BLACK MIDWEST INDUSTRIES, INC. - AR-15 BOLT CARRIER GROUP BLACK
5 Stars
(0.0)

$157.95

In stock
FAXON FIREARMS - 7.62X39MM TYPE 1 BOLT CARRIER GROUP FOR AR-15 FAXON FIREARMS - 7.62X39MM TYPE 1 BOLT CARRIER GROUP FOR AR-15
5 Stars
(0.0)

$151.80

In stock
FAXON FIREARMS - 6.8/.224 VALKYRIE BOLT CARRIER GROUP FOR AR-15 FAXON FIREARMS - 6.8/.224 VALKYRIE BOLT CARRIER GROUP FOR AR-15
5 Stars
(0.0)

$151.80

In stock
KAK INDUSTRY LLC. - M16 .224 VALKYRIE /6.8 SPECIAL BOLT CARRIER GROUP KAK INDUSTRY LLC. - M16 .224 VALKYRIE /6.8 SPECIAL BOLT CARRIER GROUP
5 Stars
(0.0)

$125.99

In stock
KAK INDUSTRY LLC. - M16 6.5MM GRENDEL TYPE 2 BOLT CARRIER GROUP KAK INDUSTRY LLC. - M16 6.5MM GRENDEL TYPE 2 BOLT CARRIER GROUP
5 Stars
(0.0)

$125.99

In stock
KAK INDUSTRY LLC. - M16 7.62X39MM BOLT CARRIER GROUP KAK INDUSTRY LLC. - M16 7.62X39MM BOLT CARRIER GROUP
5 Stars
(0.0)

$125.99

In stock
GEISSELE AUTOMATICS LLC - AR-15 RELIABILITY ENHANCEMENT KITS GEISSELE AUTOMATICS LLC - AR-15 RELIABILITY ENHANCEMENT KITS
5 Stars
(5.0)

$440.00 - $455.00

Out of Stock
J P ENTERPRISES - AR-15 5.56 FULL MASS BOLT CARRIER GROUP J P ENTERPRISES - AR-15 5.56 FULL MASS BOLT CARRIER GROUP
5 Stars
(5.0)

$356.25

Out of Stock
BROWNELLS BUNDLES - BRAVO SS 22LR CONVERSTION KIT WITH AMMO BUNDLE BROWNELLS BUNDLES - BRAVO SS 22LR CONVERSTION KIT WITH AMMO BUNDLE
5 Stars
(5.0)

$199.99

Out of Stock
RISE ARMAMENT - M16 BOLT CARRIER GROUP NICKEL BORON RISE ARMAMENT - M16 BOLT CARRIER GROUP NICKEL BORON
5 Stars
(5.0)

$179.99

Out of Stock
AERO PRECISION - 6.5 GRENDEL /6MM ARC BOLT CARRIER GROUP FOR AR-15 AERO PRECISION - 6.5 GRENDEL /6MM ARC BOLT CARRIER GROUP FOR AR-15
5 Stars
(5.0)

$159.99

Out of Stock
BATTLE ARMS DEVELOPMENT INC. - M16 BOLT CARRIER GROUP BATTLE ARMS DEVELOPMENT INC. - M16 BOLT CARRIER GROUP
5 Stars
(5.0)

$135.99

Out of Stock
WMD GUNS - M16 5.56 NICKEL BORON BOLT CARRIER GROUPS WMD GUNS - M16 5.56 NICKEL BORON BOLT CARRIER GROUPS
5 Stars
(4.8)

$174.99 - $180.99

Out of Stock
AERO PRECISION - PRO SERIES 5.56MMX45 NATO BOLT CARRIER GROUP FOR AR-15 AERO PRECISION - PRO SERIES 5.56MMX45 NATO BOLT CARRIER GROUP FOR AR-15
5 Stars
(4.7)
Add to cart to see price

Out of Stock
FAXON FIREARMS - GEN-2 9MM BOLT CARRIER GROUP FOR GLOCK® & COLT® STYLE LOWER FAXON FIREARMS - GEN-2 9MM BOLT CARRIER GROUP FOR GLOCK® & COLT® STYLE LOWER
5 Stars
(4.7)

$151.80

Out of Stock
GEISSELE AUTOMATICS LLC - AR-15 RELIABILITY ENHANCEMENT BOLT CARRIER GROUP ONLY GEISSELE AUTOMATICS LLC - AR-15 RELIABILITY ENHANCEMENT BOLT CARRIER GROUP ONLY
5 Stars
(4.5)

$385.00

Out of Stock
WILSON COMBAT - AR-15 BOLT CARRIER ASSEMBLY 5.56 NATO WILSON COMBAT - AR-15 BOLT CARRIER ASSEMBLY 5.56 NATO
5 Stars
(4.5)

$185.95 - $216.95

Out of Stock
BROWNELLS - 308 AR TITANIUM BOLT CARRIER GROUP DLC BROWNELLS - 308 AR TITANIUM BOLT CARRIER GROUP DLC
5 Stars
(4.2)

$299.99

Out of Stock
KAK INDUSTRY LLC. - K-SPEC M16 5.56X45MM NATO BOLT CARRIER GROUP KAK INDUSTRY LLC. - K-SPEC M16 5.56X45MM NATO BOLT CARRIER GROUP
5 Stars
(4.0)

$179.99 - $219.99

Out of Stock
BROWNELLS - M16 450 BUSHMASTER / 458 SOCOM BOLT CARRIER GROUP NITRIDE BROWNELLS - M16 450 BUSHMASTER / 458 SOCOM BOLT CARRIER GROUP NITRIDE
5 Stars
(3.7)

$99.99

Out of Stock
SPIKES TACTICAL - M16 5.56 BOLT CARRIER GROUP SPIKES TACTICAL - M16 5.56 BOLT CARRIER GROUP
5 Stars
(3.4)

$144.99

Out of Stock
LMT DEFENSE - ENHANCED FULL AUTO 5.56MM BOLT CARRIER GROUP LMT DEFENSE - ENHANCED FULL AUTO 5.56MM BOLT CARRIER GROUP
5 Stars
(0.0)

$512.10

Out of Stock
BROWNELLS BUNDLES - M16 BCG, BALLISTIC ADVANTAGE BBL & ATLAS RAIL BUILDER'S BUNDLE BROWNELLS BUNDLES - M16 BCG, BALLISTIC ADVANTAGE BBL & ATLAS RAIL BUILDER'S BUNDLE
5 Stars
(0.0)

$467.59

Out of Stock
J P ENTERPRISES - AR-15 6.5 GRENDEL/ 6MM ARC FULL MASS BOLT CARRIER GROUP J P ENTERPRISES - AR-15 6.5 GRENDEL/ 6MM ARC FULL MASS BOLT CARRIER GROUP
5 Stars
(0.0)

$375.25

Out of Stock
AERO PRECISION - EPC/AR9 9MM LUGER BOLT CARRIER GROUP FOR AR-15 AERO PRECISION - EPC/AR9 9MM LUGER BOLT CARRIER GROUP FOR AR-15
5 Stars
(0.0)

$179.99

Out of Stock
KAK INDUSTRY LLC. - K-SPEC M16 6.5MM GRENDEL TYPE 2 BOLT CARRIER GROUP KAK INDUSTRY LLC. - K-SPEC M16 6.5MM GRENDEL TYPE 2 BOLT CARRIER GROUP
5 Stars
(0.0)

$179.99

Out of Stock
KAK INDUSTRY LLC. - M16 5.56X45MM NATO BOLT CARRIER GROUP KAK INDUSTRY LLC. - M16 5.56X45MM NATO BOLT CARRIER GROUP
5 Stars
(0.0)

$116.99

Out of Stock
SUPERLATIVE ARMS LLC - AR-15 DIRECT IMPINGEMENT BOLT CARRIER SUPERLATIVE ARMS LLC - AR-15 DIRECT IMPINGEMENT BOLT CARRIER
5 Stars
(0.0)

$89.99

Out of Stock
Product badgeCMMG - AR MK57 CONVERSION KIT 22LR W/ MAGAZINES CMMG - AR MK57 CONVERSION KIT 22LR W/ MAGAZINES
5 Stars
(2.0)

$137.97

$199.99

No longer available
FAILZERO - FZ 5.56 Lightweight BCG FAILZERO - FZ 5.56 Lightweight BCG
5 Stars
(0.0)

$219.99

No longer available
FAILZERO - FZ 6.5 Grendel BCG FAILZERO - FZ 6.5 Grendel BCG
5 Stars
(0.0)

$172.99

No longer available
FAILZERO - FZ .224 Valkyrie FAILZERO - FZ .224 Valkyrie
5 Stars
(0.0)

$172.99

No longer available
PHASE 5 TACTICAL - AR-15 CHROME LINED BOLT CARRIER GROUP BLACK PHASE 5 TACTICAL - AR-15 CHROME LINED BOLT CARRIER GROUP BLACK
5 Stars
(0.0)

$150.00

No longer available
FAILZERO - FZ 5.56 Full Auto BCG FAILZERO - FZ 5.56 Full Auto BCG
5 Stars
(0.0)

$149.99

No longer available
FAILZERO - FZ 5.56 Semi-Auto BCG FAILZERO - FZ 5.56 Semi-Auto BCG
5 Stars
(0.0)

$140.99

No longer available
Product badgeFAILZERO - FZ .450 Bushmaster BCG FAILZERO - FZ .450 Bushmaster BCG
5 Stars
(0.0)

$129.74

$172.99

No longer available
Product badgeCMMG - AR-15 .22LR BOLT CARRIER GROUP STAINLESS STEEL CMMG - AR-15 .22LR BOLT CARRIER GROUP STAINLESS STEEL
5 Stars
(0.0)

$120.51

$189.99

No longer available
Products: –of 72
Deals
Brands
Guns

View All Guns

Gun Parts

View Suppressors View AR-15 Parts
View 1911 Parts View Parts for Glock
View Parts for Ruger 10/22 View Schematics
   
Ammunition

View All 9mm Ammunition

View All 223/5.56 Ammunition

View All 22LR Ammunition

View All Ammunition

Reloading

Tools & Cleaning

View All Gunsmithing Tools

View All Gun Cleaning Supplies

Optics

Gear

View All Gear

Trigger Times