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EXCLUSIVE DANIEL DEFENSE
MK18 & M4A1 STRIPPED UPPERS

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& Legendary Daniel Defense Quality
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Rifle Receivers & Parts

321 Items

Rifle Receivers & Parts Up To 68% Off— 321 Products In Stock / 107 Models

Our Rifle Receivers & Parts lineup includes 321 in-stock products selected from the brands serious shooters and outdoorsmen rely on. Enjoy savings Up To 68% Off on qualifying orders, and all Brownells brand products backed by our Forever Guarantee®.

You'll find options across Upper Receivers, Rifle Barreled Actions, Bolt Catch Parts, & Ejection Port Covers & Parts from 89 premium brands like AERO PRECISION, BROWNELLS, HOWA, COLT, with detailed specs to help you compare quality, materials, and performance. Verified buyers give our Rifle Receivers & Parts 4.5 Ratings out of 3,047 Reviews from verified buyers, a strong signal you can shop with confidence.

Whether you are gearing up for the range, the field, or daily carry, we stand behind every Rifle Receivers & Parts product we ship. Visit our full Rifle Parts category for the complete selection of related gear.

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Product badge DANIEL DEFENSE - MK18 STRIPPED SOCOM UPPER RECEIVER DANIEL DEFENSE - MK18 STRIPPED SOCOM UPPER RECEIVER
5 Stars
(4.5)

$749.99

$899.99

In stock
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Product badge DANIEL DEFENSE - MK18 RIII 5.56X45MM STRIPPED UPPER RECEIVER DANIEL DEFENSE - MK18 RIII 5.56X45MM STRIPPED UPPER RECEIVER
5 Stars
(4.8)

$749.99

$899.99

In stock
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Product badge DANIEL DEFENSE - M4A1 RIII 5.56X45MM STRIPPED UPPER RECEIVER DANIEL DEFENSE - M4A1 RIII 5.56X45MM STRIPPED UPPER RECEIVER
5 Stars
(4.9)

$749.99

$899.99

In stock
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Product badge DANIEL DEFENSE - M4A1 FSP 5.56X45MM STRIPPED UPPER RECEIVER DANIEL DEFENSE - M4A1 FSP 5.56X45MM STRIPPED UPPER RECEIVER
5 Stars
(4.9)

$749.99

$899.99

In stock
Product badge BROWNELLS - BRN-180 GEN 3 300 BLACKOUT 9" COMPLETE UPPER RECEIVER ASSEMBLY BROWNELLS - BRN-180 GEN 3 300 BLACKOUT 9" COMPLETE UPPER RECEIVER ASSEMBLY
5 Stars
(3.1)

$959.99

$1,199.99

In stock
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Product badge DANIEL DEFENSE - M4A1 SOCOM BLOCK II 5.56 NATO STRIPPED UPPER RECEIVER DANIEL DEFENSE - M4A1 SOCOM BLOCK II 5.56 NATO STRIPPED UPPER RECEIVER
5 Stars
(4.6)

$749.99 - $949.99

$899.99

In stock
Product badge BROWNELLS - BRN-180 GEN 3 223 WYLDE 16" COMPLETE UPPER RECEIVER ASSEMBLY BROWNELLS - BRN-180 GEN 3 223 WYLDE 16" COMPLETE UPPER RECEIVER ASSEMBLY
5 Stars
(3.3)

$959.99

$1,199.99

In stock
Product badge FIGHTLITE INDUSTRIES - MCR BELT-FED UPPER RECEIVER FULL AUTO FIGHTLITE INDUSTRIES - MCR BELT-FED UPPER RECEIVER FULL AUTO
5 Stars
(4.8)
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In stock
Product badge GEISSELE AUTOMATICS LLC - MK16 URG-I COMPLETE UPPER RECEIVERS 5.56MM GEISSELE AUTOMATICS LLC - MK16 URG-I COMPLETE UPPER RECEIVERS 5.56MM
5 Stars
(4.8)

$1,348.99

$1,525.00

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Product badge BROWNELLS - BRN-22 STRIPPED RECEIVER FOR RUGER® 10/22® BROWNELLS - BRN-22 STRIPPED RECEIVER FOR RUGER® 10/22®
5 Stars
(4.2)

$102.65 - $149.99

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Product badge VOLQUARTSEN - 10/22® RECOIL BUFFER PIN VOLQUARTSEN - 10/22® RECOIL BUFFER PIN
5 Stars
(4.2)

$12.38

In stock
Product badge ZERMATT ARMS - ORIGIN SHORT ACTION RECEIVER ZERMATT ARMS - ORIGIN SHORT ACTION RECEIVER
5 Stars
(5.0)

$900.00

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Product badge LMT DEFENSE - MARS-H SOPMOD COMPLETE LOWER RECEIVER LMT DEFENSE - MARS-H SOPMOD COMPLETE LOWER RECEIVER
5 Stars
(0.0)

$1,363.50

Online Only - In stock
Product badge FIGHTLITE INDUSTRIES - MCR DUAL-FEED 5.56X45 NATO UPPER RECEIVER FIGHTLITE INDUSTRIES - MCR DUAL-FEED 5.56X45 NATO UPPER RECEIVER
5 Stars
(0.0)
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HOWA - M1500 6.5 CREEDMOOR BARRELED ACTION HOWA - M1500 6.5 CREEDMOOR BARRELED ACTION
5 Stars
(4.5)

$552.31

Online Only - In stock
Product badge BRAVO COMPANY - AR-15 COMPLETE WIDEBODY LOWER W/MK2RMS-M1T0 & MOD-2-SOPMOD STOCK BRAVO COMPANY - AR-15 COMPLETE WIDEBODY LOWER W/MK2RMS-M1T0 & MOD-2-SOPMOD STOCK
5 Stars
(4.5)

$559.00

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Product badge HOWA - 1500 BARRELED MINI ACTIONS 6MM ARC HOWA - 1500 BARRELED MINI ACTIONS 6MM ARC
5 Stars
(4.5)

$530.77 - $552.31

Online Only - In stock
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Product badge 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
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HOWA - M1500 300 AAC BLACKOUT HEAVY THREADED BARREL MINI ACTION HOWA - M1500 300 AAC BLACKOUT HEAVY THREADED BARREL MINI ACTION
5 Stars
(5.0)

$567.69

Online Only - In stock
Product badge BROWNELLS - BRN-15 UPPER RECEIVERS 5.56MM NATO BROWNELLS - BRN-15 UPPER RECEIVERS 5.56MM NATO
5 Stars
(3.8)

$399.99 - $429.99

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Product badge GEISSELE AUTOMATICS LLC - MARITIME BOLT CATCH FOR AR-15 GEISSELE AUTOMATICS LLC - MARITIME BOLT CATCH FOR AR-15
5 Stars
(4.5)

$25.99

$31.00

In stock
Product badge BROWNELLS - XM177E2 COMPLETE UPPER RECEIVERS BROWNELLS - XM177E2 COMPLETE UPPER RECEIVERS
5 Stars
(4.4)

$806.59 - $859.99

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Product badge BRAVO COMPANY - AR-15 COMPLETE WIDEBODY LOWER RECEIVER WITH MOD-2-SOPMOD STOCK BRAVO COMPANY - AR-15 COMPLETE WIDEBODY LOWER RECEIVER WITH MOD-2-SOPMOD STOCK
5 Stars
(5.0)

$535.00

Online Only - In stock
Product badge DANIEL DEFENSE - DDM4 300s 10.3" 300 AAC BLACKOUT UPPER RECEIVER BLACK DANIEL DEFENSE - DDM4 300s 10.3" 300 AAC BLACKOUT UPPER RECEIVER BLACK
5 Stars
(0.0)

$1,392.00

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

$12.38

In stock
Product badge RADIAN WEAPONS - A-DAC 15 AMBIDEXTROUS LOWER RECEIVER RADIAN WEAPONS - A-DAC 15 AMBIDEXTROUS LOWER RECEIVER
5 Stars
(5.0)

$514.95

Online Only - In stock
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Product badge PRIMARY WEAPONS - BROWNELLS EXCLUSIVE MK1 ALPHA LT 223 WYLDE COMPLETE UPPER PRIMARY WEAPONS - BROWNELLS EXCLUSIVE MK1 ALPHA LT 223 WYLDE COMPLETE UPPER
5 Stars
(5.0)

$1,349.00

In stock
Product badge BROWNELLS - AR-15/M16 DETENT TAKEDOWN SPRINGS BROWNELLS - AR-15/M16 DETENT TAKEDOWN SPRINGS
5 Stars
(5.0)

$0.29 - $0.78

In stock
Product badge BRAVO COMPANY - RECEIVERS W/ MK2 RMS & MOD-1 SOPMOD STOCK BRAVO COMPANY - RECEIVERS W/ MK2 RMS & MOD-1 SOPMOD STOCK
5 Stars
(5.0)

$563.00

Online Only - In stock
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HOWA - 1500 308 WIN 20" THREADED HEAVY BARRELED ACTION HOWA - 1500 308 WIN 20" THREADED HEAVY BARRELED ACTION
5 Stars
(4.7)

$552.31

Online Only - In stock
Product badge PRECISION REFLEX, INC. - AR-15 MK12 MOD 0 GEN III 5.56X45 NATO UPPER RECEIVER PRECISION REFLEX, INC. - AR-15 MK12 MOD 0 GEN III 5.56X45 NATO UPPER RECEIVER
5 Stars
(0.0)

$1,709.00 - $1,729.00

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Product badge VOLQUARTSEN - 10/22® SOCKET HEAD TAKEDOWN SCREW VOLQUARTSEN - 10/22® SOCKET HEAD TAKEDOWN SCREW
5 Stars
(3.4)

$6.08

In stock
Product badge LMT DEFENSE - MRP-L M-LOK SPECWAR 5.56MM ASSEMBLED UPPER RECEIVER LMT DEFENSE - MRP-L M-LOK SPECWAR 5.56MM ASSEMBLED UPPER RECEIVER
5 Stars
(5.0)

$940.50

In stock
Product badge GEISSELE AUTOMATICS LLC - AR-15 PREMIUM MIL-SPEC BUFFER TUBE ASSEMBLY WITH SUPER 42 GEISSELE AUTOMATICS LLC - AR-15 PREMIUM MIL-SPEC BUFFER TUBE ASSEMBLY WITH SUPER 42
5 Stars
(5.0)

$105.99 - $156.99

$133.00 - $197.00

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Product badge DANIEL DEFENSE - MK18 5.56 UPPER RECEIVER GROUP COMPLETE DANIEL DEFENSE - MK18 5.56 UPPER RECEIVER GROUP COMPLETE
5 Stars
(5.0)

$1,454.00

Select Items In Stock
Product badge LMT DEFENSE - MRP-L M-LOK 5.56MM ASSEMBLED UPPER RECEIVER LMT DEFENSE - MRP-L M-LOK 5.56MM ASSEMBLED UPPER RECEIVER
5 Stars
(0.0)

$890.10 - $940.50

In stock
Product badge CMMG - AR-15 BOLT CATCH ROLL PIN CMMG - AR-15 BOLT CATCH ROLL PIN
5 Stars
(4.2)

$1.03

In stock
Product badge COLT - AR15A4 UPPER RCVR ASSEMBLY, CARBINE COLT - AR15A4 UPPER RCVR ASSEMBLY, CARBINE
5 Stars
(4.0)

$175.99

In stock
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Product badge MAGPUL - ENHANCED EJECTION PORT COVERS FOR AR-15 MAGPUL - ENHANCED EJECTION PORT COVERS FOR AR-15
5 Stars
(4.1)

$11.49 - $12.99

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Product badge LMT DEFENSE - MRP-H M-LOK 7.62MM ASSEMBLED UPPER RECEIVER LMT DEFENSE - MRP-H M-LOK 7.62MM ASSEMBLED UPPER RECEIVER
5 Stars
(0.0)

$1,181.70 - $1,413.90

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HOWA - M1500 MINI 22 ARC BARRELED ACTION HOWA - M1500 MINI 22 ARC BARRELED ACTION
5 Stars
(5.0)

$530.77 - $1,060.00

Online Only - In stock
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HOWA - M1500 308 WINCHESTER 16.25" HEAVY THREADED BARRELED ACTION HOWA - M1500 308 WINCHESTER 16.25" HEAVY THREADED BARRELED ACTION
5 Stars
(4.9)

$567.69

Online Only - In stock
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HOWA - 1500 308 WINCHESTER HEAVY VARMINT THREADED BARRELED ACTION HOWA - 1500 308 WINCHESTER HEAVY VARMINT THREADED BARRELED ACTION
5 Stars
(4.9)

$552.31

Online Only - In stock
Product badge COLT - AR15A4 UPPER RCVR, FLATTOP, MOD. CARB COLT - AR15A4 UPPER RCVR, FLATTOP, MOD. CARB
5 Stars
(4.3)

$129.99

In stock
Product badge FAXON FIREARMS - FX7 6.5 CREEDMOOR BARRELED BOLT ACTION RECEIVER FAXON FIREARMS - FX7 6.5 CREEDMOOR BARRELED BOLT ACTION RECEIVER
5 Stars
(0.0)

$934.81 - $951.37

$1,038.68 - $1,057.08

Online Only - In stock
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Product badge HOWA - M1500 223 REMINGTON 20" HEAVY THREADED BARRELED MINI ACTION HOWA - M1500 223 REMINGTON 20" HEAVY THREADED BARRELED MINI ACTION
5 Stars
(4.0)

$552.31

Online Only - In stock
Product badge GEISSELE AUTOMATICS LLC - SUPER DUTY TAKEDOWN PIN SET GEISSELE AUTOMATICS LLC - SUPER DUTY TAKEDOWN PIN SET
5 Stars
(5.0)

$15.99

$19.00

In stock
Product badge DEFIANCE MACHINE - ANTI X ACTIONS DEFIANCE MACHINE - ANTI X ACTIONS
5 Stars
(0.0)

$1,645.00

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Product badge Z-M WEAPONS - AR-15/M16 ACCU-WEDGE Z-M WEAPONS - AR-15/M16 ACCU-WEDGE
5 Stars
(4.0)

$13.99

In stock
Product badge PHASE 5 TACTICAL - AR-15 EBR V3 EXTENDED BOLT RELEASE PHASE 5 TACTICAL - AR-15 EBR V3 EXTENDED BOLT RELEASE
5 Stars
(4.8)

$54.99

In stock
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Product badge HOWA - M1500 BARRELED ACTION 300 WIN MAG THREADED HOWA - M1500 BARRELED ACTION 300 WIN MAG THREADED
5 Stars
(3.6)

$530.77 - $598.46

Online Only - In stock
Product badge PRECISION REFLEX, INC. - AR-15 MK12 MOD 0 SPR GEN II 5.56X45 NATO UPPER RECEIVER PRECISION REFLEX, INC. - AR-15 MK12 MOD 0 SPR GEN II 5.56X45 NATO UPPER RECEIVER
5 Stars
(4.0)

$1,757.00 - $1,777.00

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Product badge KAK INDUSTRY LLC. - K-SPEC 5.56X45MM NATO COMPLETE UPPER RECEIVER KAK INDUSTRY LLC. - K-SPEC 5.56X45MM NATO COMPLETE UPPER RECEIVER
5 Stars
(3.5)

$599.99

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Product badge LUTH-AR LLC - AR-15 FORWARD ASSIST ASSEMBLY LUTH-AR LLC - AR-15 FORWARD ASSIST ASSEMBLY
5 Stars
(4.4)

$11.23

In stock
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Product badge HOWA - M1500 MINI 6.5 GRENDEL BARRELED ACTION HOWA - M1500 MINI 6.5 GRENDEL BARRELED ACTION
5 Stars
(3.9)

$530.77 - $598.46

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Product badge DANIEL DEFENSE - DDM4V7 PRO 18" 5.56MM NATO COMPLETE UPPER RECEIVER BLACK DANIEL DEFENSE - DDM4V7 PRO 18" 5.56MM NATO COMPLETE UPPER RECEIVER BLACK
5 Stars
(5.0)

$1,611.00

In stock
Product badge CMMG - AR-15 BUFFER RETAINER CMMG - AR-15 BUFFER RETAINER
5 Stars
(5.0)

$2.35 - $2.95

In stock
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Product badge HOWA - M1500 308 WINCHESTER BARRELED ACTION HOWA - M1500 308 WINCHESTER BARRELED ACTION
5 Stars
(5.0)

$530.77

Online Only - In stock
Product badge BROWNELLS - AR-15 A1 EJECTION PORT COVER ASSEMBLY BROWNELLS - AR-15 A1 EJECTION PORT COVER ASSEMBLY
5 Stars
(4.4)

$14.72

In stock
Product badge HAWKINS PRECISION, LLC - REMINGTON 700 M5 DBM BOTTOM METALS HAWKINS PRECISION, LLC - REMINGTON 700 M5 DBM BOTTOM METALS
5 Stars
(5.0)

$214.00

In stock
Product badge VOLQUARTSEN - 10/22® SUPERLITE RECEIVER VOLQUARTSEN - 10/22® SUPERLITE RECEIVER
5 Stars
(3.6)

$302.00

Online Only - In stock
Product badge BROWNELLS - AR-15 BUFFER RETAINER SPRINGS BROWNELLS - AR-15 BUFFER RETAINER SPRINGS
5 Stars
(5.0)

$4.99 - $5.99

In stock
Product badge CMMG - AR-15 PIVOT PIN DETENT SPRING CMMG - AR-15 PIVOT PIN DETENT SPRING
5 Stars
(4.8)

$0.99

$1.03

In stock
Product badge CMMG - AR-15 Ejection Cover Hinge Pin Snap Ring CMMG - AR-15 Ejection Cover Hinge Pin Snap Ring
5 Stars
(5.0)

$1.38

In stock
Products:  33  –  64  of 647