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Primer Days Sale - $0 Hazmat Fee + Free Shipping On $49+ Orders - SHOP NOW

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DANIEL DEFENSE MK18
& M4A1 STRIPPED UPPERS

Available ONLY From Brownells
Start Your Clone!
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NEW UPPERS FROM
KAK INDUSTRIES

Feature Packed Exclusive Uppers Including
Down Vent BCG, Chrome Lining & MORE

Discover Now

Rifle Receivers & Parts

857 Items

Rifle Receivers & Parts Up To 85% Off - 529 Products In Stock / 87 Models

Browse 529 Rifle Receivers & Parts from our Rifle Parts dept including Upper Receivers, Lower Receivers, Rifle Barreled Actions, Bolt Catch Parts, & Rifle Bottom Metals Up To 85% Off from TOP Brands including AERO PRECISION, BROWNELLS, HOWA, & CHRISTENSEN ARMS.

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BROWNELLS - BRN-22 STRIPPED RECEIVER FOR RUGER® 10/22® BROWNELLS - BRN-22 STRIPPED RECEIVER FOR RUGER® 10/22®
5 Stars
(4.1)

$95.99 - $162.99

In stock
MAGPUL - B.A.D. LEVER® BATTERY ASSIST DEVICE FOR AR-15/M4 MAGPUL - B.A.D. LEVER® BATTERY ASSIST DEVICE FOR AR-15/M4
5 Stars
(4.4)

$26.49

In stock
AERO PRECISION - M4E1 STRIPPED LOWER RECEIVERS FOR AR-15 AERO PRECISION - M4E1 STRIPPED LOWER RECEIVERS FOR AR-15
5 Stars
(4.7)
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AERO PRECISION - GEN 2 STRIPPED LOWER RECEIVER FOR AR-15 AERO PRECISION - GEN 2 STRIPPED LOWER RECEIVER FOR AR-15
5 Stars
(4.5)
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Online Only - In stock
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DANIEL DEFENSE - M4A1 STRIPPED SOCOM UPPER RECEIVER 14.5IN 5.56 DANIEL DEFENSE - M4A1 STRIPPED SOCOM UPPER RECEIVER 14.5IN 5.56
5 Stars
(4.6)

$694.99 - $811.99

In stock
GEISSELE AUTOMATICS LLC - AR-15 MARITIME BOLT CATCH BLACK GEISSELE AUTOMATICS LLC - AR-15 MARITIME BOLT CATCH BLACK
5 Stars
(4.4)

$17.99

In stock
AERO PRECISION - M5 STRIPPED LOWER RECEIVER FOR AR .308 AERO PRECISION - M5 STRIPPED LOWER RECEIVER FOR AR .308
5 Stars
(4.6)
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COLT - M4 5.56 UPPER RECEIVER GROUPS COLT - M4 5.56 UPPER RECEIVER GROUPS
5 Stars
(4.2)

$444.99 - $909.99

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Product badge BROWNELLS - AR-15 C7 STRIPPED UPPER RECEIVER BROWNELLS - AR-15 C7 STRIPPED UPPER RECEIVER
5 Stars
(3.9)

$149.99

In stock
YANKEE HILL MACHINE CO., INC. - AR-15/M16 EZ PULL PIVOT & TAKEDOWN PIN SET YANKEE HILL MACHINE CO., INC. - AR-15/M16 EZ PULL PIVOT & TAKEDOWN PIN SET
5 Stars
(4.2)

$17.99

In stock
VOLQUARTSEN - RUGER® 10/22® BOLT RELEASE VOLQUARTSEN - RUGER® 10/22® BOLT RELEASE
5 Stars
(4.5)

$12.99

In stock
BROWNELLS - BRN-180™ GEN2 223 WYLDE 16" COMPLETE UPPER RECEIVER ASSEMBLY BROWNELLS - BRN-180™ GEN2 223 WYLDE 16" COMPLETE UPPER RECEIVER ASSEMBLY
5 Stars
(4.2)

$899.99

In stock
ANDERSON MANUFACTURING - AR-15 STRIPPED LOWER RECEIVER ANDERSON MANUFACTURING - AR-15 STRIPPED LOWER RECEIVER
5 Stars
(4.8)

$49.99

Online Only - In stock
BROWNELLS - BRN-22 TAKEDOWN STRIPPED RECEIVER FOR RUGER 10/22® BROWNELLS - BRN-22 TAKEDOWN STRIPPED RECEIVER FOR RUGER 10/22®
5 Stars
(4.3)

$153.49 - $159.99

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PHASE 5 TACTICAL - 308 AR V2 EXTENDED BOLT RELEASE PHASE 5 TACTICAL - 308 AR V2 EXTENDED BOLT RELEASE
5 Stars
(4.4)

$59.99

In stock
Z-M WEAPONS - AR-15/M16 ACCU-WEDGE Z-M WEAPONS - AR-15/M16 ACCU-WEDGE
5 Stars
(4.1)

$13.99

In stock
BROWNELLS - BRN-180S™ GEN2 223 WYLDE COMPLETE UPPER RECEIVER ASSEMBLY BROWNELLS - BRN-180S™ GEN2 223 WYLDE COMPLETE UPPER RECEIVER ASSEMBLY
5 Stars
(4.2)

$899.99

In stock
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HOWA - 1500 BARRELED MINI ACTIONS 6MM ARC HOWA - 1500 BARRELED MINI ACTIONS 6MM ARC
5 Stars
(4.5)

$449.99 - $479.99

Online Only - In stock
VOLQUARTSEN - 10/22® SOCKET HEAD TAKEDOWN SCREW VOLQUARTSEN - 10/22® SOCKET HEAD TAKEDOWN SCREW
5 Stars
(3.2)

$6.49

In stock
AERO PRECISION - M5 (.308) ASSEMBLED UPPER RECEIVER /NO BARREL FOR AR .308 AERO PRECISION - M5 (.308) ASSEMBLED UPPER RECEIVER /NO BARREL FOR AR .308
5 Stars
(4.6)
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In stock
WMD GUNS - AR-15/M16 NiB-X® COATED UPPER RECEIVER WMD GUNS - AR-15/M16 NiB-X® COATED UPPER RECEIVER
5 Stars
(3.7)

$166.99 - $167.49

In stock
LEGACY SPORTS INTERNATIONAL - REMINGTON 700 DETACHABLE MAGAZINE DROP-IN KITS LEGACY SPORTS INTERNATIONAL - REMINGTON 700 DETACHABLE MAGAZINE DROP-IN KITS
5 Stars
(3.5)

$68.99 - $75.99

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KNS PRECISION, INC. - AR-15/M16 NON-ROTATING PIN SET KNS PRECISION, INC. - AR-15/M16 NON-ROTATING PIN SET
5 Stars
(4.9)

$32.99 - $33.99

In stock
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HOWA - M1500 6.5 CREEDMOOR BARRELED ACTION HOWA - M1500 6.5 CREEDMOOR BARRELED ACTION
5 Stars
(4.7)

$404.99 - $549.99

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AERO PRECISION - 5.56X45MM NATO ASSEMBLED UPPER RECEIVER FOR AR-15 AERO PRECISION - 5.56X45MM NATO ASSEMBLED UPPER RECEIVER FOR AR-15
5 Stars
(4.5)
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In stock
BROWNELLS - AR-15/M16 SLICKSIDE 601 UPPER RECEIVER BROWNELLS - AR-15/M16 SLICKSIDE 601 UPPER RECEIVER
5 Stars
(3.3)

$156.99

In stock
MAGPUL - HUNTER 700 SHORT ACTION MAGAZINE WELL BOTTOM METAL MAGPUL - HUNTER 700 SHORT ACTION MAGAZINE WELL BOTTOM METAL
5 Stars
(4.3)

$62.99

In stock
MAGPUL - ENHANCED EJECTION PORT COVERS FOR AR-15 MAGPUL - ENHANCED EJECTION PORT COVERS FOR AR-15
5 Stars
(3.9)

$11.49 - $12.99

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BROWNELLS - BRN-180S™ GEN2 300 BLACKOUT 10" COMPLETE UPPER RECEIVER ASSEMBLY BROWNELLS - BRN-180S™ GEN2 300 BLACKOUT 10" COMPLETE UPPER RECEIVER ASSEMBLY
5 Stars
(4.2)

$999.99

In stock
Product badge BROWNELLS - BRN-4® UPPER RECEIVER ASSEMBLIES BROWNELLS - BRN-4® UPPER RECEIVER ASSEMBLIES
5 Stars
(3.6)

$999.00

$1,199.00

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HOWA - 1500 6.5 GRENDEL 20" THREADED HEAVY BARRELED MINI ACTION HOWA - 1500 6.5 GRENDEL 20" THREADED HEAVY BARRELED MINI ACTION
5 Stars
(4.1)

$443.99

Online Only - In stock
BROWNELLS - BRN-4 STRIPPED UPPER RECEIVER BILLET BROWNELLS - BRN-4 STRIPPED UPPER RECEIVER BILLET
5 Stars
(3.6)

$215.99

In stock
Products:   –   of 857