Daily Deal: Winchester USA M193 5.56mm 55gr FMJ 200Rd Box - $129.99 $116.99 Today Only!

Daily Deal: Winchester USA M193 5.56mm 55gr FMJ 200Rd Box - $129.99 $116.99 Today Only!

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MK18 & M4A1 STRIPPED UPPERS

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Rifle Receivers & Parts

327 Items

Rifle Receivers & Parts Up To 68% Off— 327 Products In Stock / 107 Models

Our Rifle Receivers & Parts lineup includes 327 in-stock products selected from the brands serious shooters and outdoorsmen rely on. Enjoy savings Up To 68% Off on qualifying orders, all protected by our Forever Guarantee®.

You'll find options across Upper Receivers, Rifle Barreled Actions, Bolt Catch Parts, & Ejection Port Covers & Parts from 92 premium brands like AERO PRECISION, BROWNELLS, HOWA, REMINGTON, with detailed specs to help you compare quality, materials, and performance. Verified buyers give our Rifle Receivers & Parts 4.5 Ratings out of 3,134 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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KNIGHT'S ARMAMENT - SR-25 K6 6.5MM CREEDMOOR ASSEMBLED UPPPER RECEIVER KNIGHT'S ARMAMENT - SR-25 K6 6.5MM CREEDMOOR ASSEMBLED UPPPER RECEIVER
5 Stars
(0.0)

$3,146.40

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

$899.99

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

$899.99

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DANIEL DEFENSE - M4A1 RIII 5.56X45MM STRIPPED UPPER RECEIVER DANIEL DEFENSE - M4A1 RIII 5.56X45MM STRIPPED UPPER RECEIVER
5 Stars
(4.9)

$899.99

In stock
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
(2.9)

$1,199.99

In stock
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BROWNELLS - BRN-180 GEN 3 223 WYLDE 13.9" COMPLETE UPPER RECEIVER BROWNELLS - BRN-180 GEN 3 223 WYLDE 13.9" COMPLETE UPPER RECEIVER
5 Stars
(3.1)

$1,199.99

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DANIEL DEFENSE - MK18 RIII 5.56X45MM STRIPPED UPPER RECEIVER DANIEL DEFENSE - MK18 RIII 5.56X45MM STRIPPED UPPER RECEIVER
5 Stars
(4.8)

$899.99

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

$119.99 - $149.99

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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)

$1,199.99

In stock
BRAVO COMPANY - LOWER RECEIVERS W/ MK 2 RMS & MOD-0 STOCK BRAVO COMPANY - LOWER RECEIVERS W/ MK 2 RMS & MOD-0 STOCK
5 Stars
(4.6)

$549.00 - $599.99

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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)

$899.99 - $949.99

In stock
BROWNELLS - BRN-22 TAKEDOWN STRIPPED RECEIVER FOR RUGER 10/22® BROWNELLS - BRN-22 TAKEDOWN STRIPPED RECEIVER FOR RUGER 10/22®
5 Stars
(4.4)

$169.99

In stock
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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
FIGHTLITE INDUSTRIES - MCR DUAL-FEED 5.56X45 NATO UPPER RECEIVER FIGHTLITE INDUSTRIES - MCR DUAL-FEED 5.56X45 NATO UPPER RECEIVER
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LMT DEFENSE - MARS-H SOPMOD COMPLETE LOWER RECEIVER LMT DEFENSE - MARS-H SOPMOD COMPLETE LOWER RECEIVER
5 Stars
(0.0)

$1,363.50

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AMERICAN DEFENSE MANUFACTURING - UIC-180 STRIPPED LOWER AMBIDEXTROUS RECEIVER AMERICAN DEFENSE MANUFACTURING - UIC-180 STRIPPED LOWER AMBIDEXTROUS RECEIVER
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GEISSELE AUTOMATICS LLC - MARITIME BOLT CATCH FOR AR-15 GEISSELE AUTOMATICS LLC - MARITIME BOLT CATCH FOR AR-15
5 Stars
(4.5)

$31.00

In stock
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
(4.3)

$559.00

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BRAVO COMPANY - LOWERS W/ MK2 RMS & MOD 0 SOPMOD STOCK BRAVO COMPANY - LOWERS W/ MK2 RMS & MOD 0 SOPMOD STOCK
5 Stars
(5.0)

$549.00 - $549.99

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BROWNELLS - AR-15 C7 STRIPPED UPPER RECEIVER BROWNELLS - AR-15 C7 STRIPPED UPPER RECEIVER
5 Stars
(3.8)

$149.99

In stock
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

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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)

$133.00 - $197.00

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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

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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
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
BROWNELLS - XM177E2 COMPLETE UPPER RECEIVERS BROWNELLS - XM177E2 COMPLETE UPPER RECEIVERS
5 Stars
(4.4)

$806.59 - $859.99

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

$530.77 - $552.31

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

$12.38

In stock
MAGPUL - ENHANCED EJECTION PORT COVERS FOR AR-15 MAGPUL - ENHANCED EJECTION PORT COVERS FOR AR-15
5 Stars
(4.0)

$11.49 - $12.99

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HOWA - M1500 6.5 PRC LA THREADED BARRELED ACTION HOWA - M1500 6.5 PRC LA THREADED BARRELED ACTION
5 Stars
(4.3)

$530.77 - $598.46

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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

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LMT DEFENSE - MARS-L SOPMOD COMPLETE LOWER RECEIVER LMT DEFENSE - MARS-L SOPMOD COMPLETE LOWER RECEIVER
5 Stars
(4.7)

$969.30

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ZERMATT ARMS - TL3 SHORT ACTION RECEIVER ZERMATT ARMS - TL3 SHORT ACTION RECEIVER
5 Stars
(5.0)

$1,300.00

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HOWA - M1500 300 PRC 24" BARRELED ACTION HOWA - M1500 300 PRC 24" BARRELED ACTION
5 Stars
(4.3)

$552.31

Online Only - In stock
BRAVO COMPANY - COMPLETE LOWER RECEIVER W/ BCMGUNFIGHTER™ STOCK FOR AR-15 BRAVO COMPANY - COMPLETE LOWER RECEIVER W/ BCMGUNFIGHTER™ STOCK FOR AR-15
5 Stars
(4.7)

$470.00 - $525.00

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CMMG - AR-15 PIVOT PIN DETENT SPRING CMMG - AR-15 PIVOT PIN DETENT SPRING
5 Stars
(4.8)

$1.03

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
BROWNELLS - BRN-180M STRIPPED LOWER RECEIVER BLACK AMBIDEXTROUS BROWNELLS - BRN-180M STRIPPED LOWER RECEIVER BLACK AMBIDEXTROUS
5 Stars
(3.5)

$299.99

In stock
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
LUTH-AR LLC - AR-15 TEAR DROP FORWARD ASSIST ASSEMBLY LUTH-AR LLC - AR-15 TEAR DROP FORWARD ASSIST ASSEMBLY
5 Stars
(4.6)

$18.49

In stock
BROWNELLS BUNDLES - DD 10.3" MK18 SOCOM UPPER RECEIVERS W/ OPTICS BROWNELLS BUNDLES - DD 10.3" MK18 SOCOM UPPER RECEIVERS W/ OPTICS
5 Stars
(0.0)

$1,523.69 - $1,678.89

In stock
ZRO DELTA - AR-15 FORGED M4 UPPER RECEIVER 5.56MM ZRO DELTA - AR-15 FORGED M4 UPPER RECEIVER 5.56MM
5 Stars
(5.0)

$69.99

In stock
VOLQUARTSEN - RUGER® 10/22® BOLT RELEASE VOLQUARTSEN - RUGER® 10/22® BOLT RELEASE
5 Stars
(4.6)

$12.38

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

$1.03

In stock
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5 Stars
(4.5)

$5.07

$7.99

In stock
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HOWA - M1500 BARRELED ACTION 7MM REM MAG THREADED HOWA - M1500 BARRELED ACTION 7MM REM MAG THREADED
5 Stars
(0.0)

$530.77 - $598.46

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KIDD INNOVATIVE DESIGN - RECEIVER CROSS PINS FOR RUGER 10/22 KIDD INNOVATIVE DESIGN - RECEIVER CROSS PINS FOR RUGER 10/22
5 Stars
(0.0)

$8.00

In stock
BROWNELLS - GAU-5A 12.7" 1-12 UPPER RECEIVERS BROWNELLS - GAU-5A 12.7" 1-12 UPPER RECEIVERS
5 Stars
(0.0)

$985.99

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HOWA - M1500 223 REMINGTON 20" HEAVY THREADED BARRELED MINI ACTION HOWA - M1500 223 REMINGTON 20" HEAVY THREADED BARRELED MINI ACTION
5 Stars
(3.9)

$552.31

Online Only - In stock
Z-M WEAPONS - AR-15/M16 ACCU-WEDGE Z-M WEAPONS - AR-15/M16 ACCU-WEDGE
5 Stars
(4.0)

$13.99

In stock
BROWNELLS BUNDLES - DD 10.3" MK18 RIII UPPER RECEIVER W/ EOTECH OPTICS BROWNELLS BUNDLES - DD 10.3" MK18 RIII UPPER RECEIVER W/ EOTECH OPTICS
5 Stars
(0.0)

$1,523.69 - $1,678.89

In stock
BROWNELLS BUNDLES - DD 14.5" M4A1 FSP UPPER RECEIVER W/ EOTECH OPTICS BROWNELLS BUNDLES - DD 14.5" M4A1 FSP UPPER RECEIVER W/ EOTECH OPTICS
5 Stars
(0.0)

$1,523.69 - $1,678.89

In stock
BRAVO COMPANY - BLEM LOWER RECEIVER W/ MOD-1 SOPMOD COMPARTMENT STOCK BRAVO COMPANY - BLEM LOWER RECEIVER W/ MOD-1 SOPMOD COMPARTMENT STOCK
5 Stars
(0.0)

$480.00

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PRIMARY WEAPONS - MK114 MOD 2-M 223 WYLDE COMPLETE UPPER RECEIVER PRIMARY WEAPONS - MK114 MOD 2-M 223 WYLDE COMPLETE UPPER RECEIVER
5 Stars
(0.0)

$1,399.95

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BATTLE ARMS DEVELOPMENT INC. - WORKHORSE BLEM STRIPPED UPPER RECEIVER FOR AR-15 BATTLE ARMS DEVELOPMENT INC. - WORKHORSE BLEM STRIPPED UPPER RECEIVER FOR AR-15
5 Stars
(0.0)

$79.99

In stock
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

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VOLQUARTSEN - 10/22® SUPERLITE RECEIVER VOLQUARTSEN - 10/22® SUPERLITE RECEIVER
5 Stars
(3.6)

$302.00

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BROWNELLS - AR-15/M16 M16A2 STRIPPED UPPER RECEIVER BROWNELLS - AR-15/M16 M16A2 STRIPPED UPPER RECEIVER
5 Stars
(1.5)

$149.99

In stock
FORWARD CONTROLS DESIGN LLC - AR-15 BUFFER RETAINER STAINLESS STEEL FORWARD CONTROLS DESIGN LLC - AR-15 BUFFER RETAINER STAINLESS STEEL
5 Stars
(5.0)

$7.60

In stock
WILSON COMBAT - AR-15 EJECTION PORT COVER PARTS KIT ONLY WILSON COMBAT - AR-15 EJECTION PORT COVER PARTS KIT ONLY
5 Stars
(5.0)

$3.95

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

$0.29 - $0.78

In stock
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

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SONS OF LIBERTY GUN WORKS - FORWARD ASSIST ASSEMBLY FOR AR-15 SONS OF LIBERTY GUN WORKS - FORWARD ASSIST ASSEMBLY FOR AR-15
5 Stars
(5.0)

$24.99

In stock
BROWNELLS - AR-15 FORWARD ASSIST ROLL PIN BROWNELLS - AR-15 FORWARD ASSIST ROLL PIN
5 Stars
(2.5)

$4.99

In stock
Products:  33  –  64  of 685