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"PLUG-N-PLAY" GAS PISTON CONVERION!

Brownells BRN-4 Upper Receiver

Built with all new-manufactured HK416-compatible parts. Drops onto any standard "mil-spec" AR-15 lower!

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Rifle Parts

4673 Items

Browse Rifle Parts Products Up To 83% Off including Rifle Receivers & Parts, Rifle Stocks & Parts, & Rifle Sights & Parts! - 4,673 Products / 329 Brands

Take a look at 4,673 Rifle Parts Products Up To 83% Off within our Gun Parts including Rifle Receivers & Parts, Rifle Stocks & Parts, & Rifle Sights & Parts From Top Brands like BROWNELLS, AERO PRECISION, CMMG and more!

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

$164.99 - $195.99

$189.99

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Product badge LAW TACTICAL LLC - AR-15/M16 GEN3-M FOLDING STOCK ADAPTER LAW TACTICAL LLC - AR-15/M16 GEN3-M FOLDING STOCK ADAPTER
5 Stars
(4.6)

$239.99

$269.99 - $279.99

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Product badge GEISSELE AUTOMATICS LLC - AR-15 ENHANCED TRIGGERS GEISSELE AUTOMATICS LLC - AR-15 ENHANCED TRIGGERS
5 Stars
(4.4)

$159.99

$189.99

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Product badge MAGPUL - AR-15/M16 B.A.D. LEVER™ MAGPUL - AR-15/M16 B.A.D. LEVER™
5 Stars
(4.4)

$26.99

$31.30

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GEISSELE AUTOMATICS LLC - AR-15/M16/308 AR SSA & SSA-E TRIGGER GEISSELE AUTOMATICS LLC - AR-15/M16/308 AR SSA & SSA-E TRIGGER
5 Stars
(4.9)
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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
(3.7)

$119.99 - $139.99

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J P ENTERPRISES - AR-15 REDUCED POWER SPRING KIT J P ENTERPRISES - AR-15 REDUCED POWER SPRING KIT
5 Stars
(4.6)

$10.40

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ALG DEFENSE - AR-15 ENHANCED MILITARY-STYLE TRIGGERS ALG DEFENSE - AR-15 ENHANCED MILITARY-STYLE TRIGGERS
5 Stars
(4.6)

$68.25 - $79.00

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Product badge BROWNELLS - M16 5.56 LIGHTWEIGHT BOLT CARRIER GROUP BROWNELLS - M16 5.56 LIGHTWEIGHT BOLT CARRIER GROUP
5 Stars
(4.5)

$79.99 - $109.99

$149.99 - $239.99

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Product badge CMC TRIGGERS - AR-15 TACTICAL TRIGGER GROUP CMC TRIGGERS - AR-15 TACTICAL TRIGGER GROUP
5 Stars
(4.5)

$129.99 - $174.00

$139.99

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Product badge BROWNELLS - 308AR BOLT CARRIER GROUPS BROWNELLS - 308AR BOLT CARRIER GROUPS
5 Stars
(4.4)

$129.99 - $149.99

$179.99 - $199.99

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Product badge LUTH-AR LLC - AR-15 A1 REAR SIGHT ASSEMBLY LUTH-AR LLC - AR-15 A1 REAR SIGHT ASSEMBLY
5 Stars
(2.9)
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Product badge AERO PRECISION - AR-15 M4E1 STRIPPED LOWER RECEIVERS 5.56MM AERO PRECISION - AR-15 M4E1 STRIPPED LOWER RECEIVERS 5.56MM
5 Stars
(4.7)

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ROCK RIVER ARMS - AR-15 NATIONAL MATCH 2-STAGE TRIGGER ROCK RIVER ARMS - AR-15 NATIONAL MATCH 2-STAGE TRIGGER
5 Stars
(4.0)

$106.99

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Product badge WHITE OAK ARMAMENT - AR-15/M16 223 WYLDE MATCH BARRELS WHITE OAK ARMAMENT - AR-15/M16 223 WYLDE MATCH BARRELS
5 Stars
(4.5)

$279.99 - $289.99

$288.99 - $295.49

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TIMNEY - AR-15 DROP-IN TRIGGER MODULE SOLID SHOE TIMNEY - AR-15 DROP-IN TRIGGER MODULE SOLID SHOE
5 Stars
(4.5)
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GEISSELE AUTOMATICS LLC - SUPER DYNAMIC TRIGGERS FOR AR-15 GEISSELE AUTOMATICS LLC - SUPER DYNAMIC TRIGGERS FOR AR-15
5 Stars
(4.9)
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Product badge KE ARMS LLC - AR-15 KP-15 STRIPPED LOWER RECEIVERS POLYMER KE ARMS LLC - AR-15 KP-15 STRIPPED LOWER RECEIVERS POLYMER
5 Stars
(4.5)

$69.99

$109.99

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Product badge MAGPUL - AR-15 MBUS GEN 2 SIGHT SET MAGPUL - AR-15 MBUS GEN 2 SIGHT SET
5 Stars
(4.5)

$64.99

$68.99

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Product badge FOXTROT MIKE PRODUCTS - AR-15 9MM UPPER RECEIVERS M-LOK ASSEMBLED FOXTROT MIKE PRODUCTS - AR-15 9MM UPPER RECEIVERS M-LOK ASSEMBLED
5 Stars
(4.9)

$259.99 - $399.99

$379.99 - $429.99

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AERO PRECISION - AR-15 GEN 2 STRIPPED LOWER RECEIVER AERO PRECISION - AR-15 GEN 2 STRIPPED LOWER RECEIVER
5 Stars
(4.5)

$110.49 - $114.99

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Product badge MAGPUL - AR-15 CTR STOCK COLLAPSIBLE MIL-SPEC MAGPUL - AR-15 CTR STOCK COLLAPSIBLE MIL-SPEC
5 Stars
(4.8)

$46.99 - $52.99

$61.70

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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)

$17.40

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Product badge E.R. SHAW - RUGER® 10/22® TARGET BARRELS E.R. SHAW - RUGER® 10/22® TARGET BARRELS
5 Stars
(4.8)

$99.99 - $210.99

$115.49 - $239.99

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BROWNELLS BUNDLES - M16 5.56 BOLT CARRIER GROUP NITRIDE MP BROWNELLS BUNDLES - M16 5.56 BOLT CARRIER GROUP NITRIDE MP
5 Stars
(4.5)

$109.99

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CRITERION BARRELS INC - AR-15/M16 223 WYLDE CHROME LINED BARRELS CRITERION BARRELS INC - AR-15/M16 223 WYLDE CHROME LINED BARRELS
5 Stars
(4.9)

$269.99 - $296.99

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HOGUE - AR-15 PISTOL GRIP HOGUE - AR-15 PISTOL GRIP
5 Stars
(4.8)

$25.46

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ZRO DELTA - AR-15 ELG LOWER PARTS KIT ZRO DELTA - AR-15 ELG LOWER PARTS KIT
5 Stars
(3.9)

$39.99 - $52.99

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Product badge BREEK ARMS - AR-15 WARHAMMER MOD2 AMBIDEXTROUS CHARGING HANDLE BREEK ARMS - AR-15 WARHAMMER MOD2 AMBIDEXTROUS CHARGING HANDLE
5 Stars
(4.7)

$44.99 - $99.99

$129.98 - $134.98

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

$47.59

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Product badge MAGPUL - AR-15 MOE STOCK COLLAPSIBLE MIL-SPEC MAGPUL - AR-15 MOE STOCK COLLAPSIBLE MIL-SPEC
5 Stars
(4.4)

$31.99 - $36.99

$42.70

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Product badge MAGPUL - AR-15/M16 ENHANCED TRIGGERGUARD MAGPUL - AR-15/M16 ENHANCED TRIGGERGUARD
5 Stars
(4.4)

$16.99

$21.80

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Product badge MIDWEST INDUSTRIES, INC. - AR-15 COMBAT HANDGUARDS FREE FLOAT M-LOK MIDWEST INDUSTRIES, INC. - AR-15 COMBAT HANDGUARDS FREE FLOAT M-LOK
5 Stars
(4.8)
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PRECISION ARMAMENT - AR .308 M11 MUZZLE BRAKE 30 CALIBER PRECISION ARMAMENT - AR .308 M11 MUZZLE BRAKE 30 CALIBER
5 Stars
(4.8)

$120.99 - $145.99

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RUGER - 10/22® BX-TRIGGER® RUGER - 10/22® BX-TRIGGER®
5 Stars
(4.8)

$93.99

In stock
Product badge MAGPUL - AR-15 ACS STOCK COLLAPSIBLE MIL-SPEC MAGPUL - AR-15 ACS STOCK COLLAPSIBLE MIL-SPEC
5 Stars
(4.9)

$67.99

$90.20

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Product badge BROWNELLS - AR-15 STOCK ASSY COLLAPSIBLE MIL-SPEC BROWNELLS - AR-15 STOCK ASSY COLLAPSIBLE MIL-SPEC
5 Stars
(4.5)

$59.99

$69.99

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

$11.70

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Product badge AERO PRECISION - AR-15 ATLAS S-ONE SLIM LINE HANDGUARDS FREE FLOAT M-LOK AERO PRECISION - AR-15 ATLAS S-ONE SLIM LINE HANDGUARDS FREE FLOAT M-LOK
5 Stars
(4.5)

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RISE ARMAMENT - AR-15 RA-140 RAVE SUPER SPORTING TRIGGER RISE ARMAMENT - AR-15 RA-140 RAVE SUPER SPORTING TRIGGER
5 Stars
(4.1)
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TUFFER BUFFER - RUGER® 10/22® BOLT BUFFER TUFFER BUFFER - RUGER® 10/22® BOLT BUFFER
5 Stars
(4.3)

$14.49 - $30.99

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Product badge 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)

$849.99 - $1,129.99

$989.99

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Product badge AERO PRECISION - 308 AR M5 LOWER RECEIVER AERO PRECISION - 308 AR M5 LOWER RECEIVER
5 Stars
(4.5)

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KNS PRECISION, INC. - AR-15 GEN. 2 MOD. 2 NON-ROTATING PIN SET KNS PRECISION, INC. - AR-15 GEN. 2 MOD. 2 NON-ROTATING PIN SET
5 Stars
(4.6)

$34.49 - $35.49

In stock
J P ENTERPRISES - AR-15 ANTI-WALK PINS J P ENTERPRISES - AR-15 ANTI-WALK PINS
5 Stars
(4.2)

$15.15

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B5 SYSTEMS - AR-15 SOPMOD BRAVO STOCK COLLAPSIBLE MIL-SPEC B5 SYSTEMS - AR-15 SOPMOD BRAVO STOCK COLLAPSIBLE MIL-SPEC
5 Stars
(4.0)

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BROWNELLS - M16 5.56 BOLT CARRIER GROUP CHROME MP BROWNELLS - M16 5.56 BOLT CARRIER GROUP CHROME MP
5 Stars
(3.9)

$139.99

In stock
Product badge MAGPUL - PICATINNY AFG1 ANGLED FORE GRIP MAGPUL - PICATINNY AFG1 ANGLED FORE GRIP
5 Stars
(4.3)

$24.99 - $29.99

$33.20

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