Skip to main content
We may get paid by partner for deals, including promoted items

Menu

Trending
Top Brands Palmetto State ArmoryHot Yeti CoolerDeal NatchezDeal SitkaDeal 5.11Sale Winter Clearance Amazon Pickleball Sale Amazon FitnessHot Stores
Ar-15 Receiver Extension Castle Nut - Ar-15/M16 M4 Receiver Castle Nut by Ergo Grips -

Product Description

Falcon Industries/ERGO brings this receiver extension castle nut for M4 style receiver extension tubes. Mfg: Ergo Grips

Ar-15 Receiver Extension Castle Nut - Ar-15/M16 M4 Receiver Castle Nut

at Brownells.com
Browse all Brownells.com deals
$9.29
In Stock at Brownells.com
Price checked 10 days ago
Buy Now at Brownells.com
Secure checkout Easy returns
or compare prices
Amazon logo Amazon eBay logo eBay

Product Details

Brand Ergo Grips
Ergo Grips

More from Ergo Grips

Primary Arms
Last Updated:
Sep 06, 2026 09:41 AM
ERGO AR15/AR10 Suregrip AT - Flat Dark Earth - Open Box ERGO AR15/AR10 Suregrip AT - Flat Dark Earth - Open Box View Details
$18.85
Buy Now · $18.85
Primary Arms
United States Association of Gun Owners
Last Updated:
Sep 06, 2026 08:23 AM
Ergo Grips TDX-0 Tactical Deluxe Zero Angle SureGrip Black Ergo Grips TDX-0 Tactical Deluxe Zero Angle SureGrip Black View Details
$39.05
Buy Now · $39.05
United States Association of Gun Owners
United States Association of Gun Owners
Last Updated:
Sep 06, 2026 08:23 AM
Ergo Grips Flat Top SureGrip Ambi AR-15/AR-308 Grip - Black Ergo Grips Flat Top SureGrip Ambi AR-15/AR-308 Grip - Black View Details
$27.89
Buy Now · $27.89
United States Association of Gun Owners
United States Association of Gun Owners
Last Updated:
Sep 06, 2026 08:23 AM
Ergo Grips Ambidextrous Rigid Ergo Grip for AR-15 - Black Polymer Ergo Grips Ambidextrous Rigid Ergo Grip for AR-15 - Black Polymer View Details
$20.45
Buy Now · $20.45
United States Association of Gun Owners
Shooting Surplus
Last Updated:
Sep 06, 2026 07:33 AM
ERGO AR15 DLX GRIP W/PALM SHELF FDE ERGO AR15 DLX GRIP W/PALM SHELF FDE View Details
$39.75
Buy Now · $39.75
Shooting Surplus
Shooting Surplus
Last Updated:
Sep 06, 2026 07:33 AM
ERGO X GRIP HEAVY TEXTURE FDE ERGO X GRIP HEAVY TEXTURE FDE View Details
$24.57
Buy Now · $24.57
Shooting Surplus
Primary Arms
Last Updated:
Sep 06, 2026 09:41 AM
4020-BK 4020-BK View Details
$34.99
Buy Now · $34.99
Primary Arms
Primary Arms
Last Updated:
Sep 06, 2026 09:41 AM
4020-DE 4020-DE View Details
$34.99
Buy Now · $34.99
Primary Arms
Primary Arms
Last Updated:
Sep 06, 2026 09:41 AM
EG4045-BK EG4045-BK View Details
$34.99
Buy Now · $34.99
Primary Arms
Primary Arms
Last Updated:
Sep 06, 2026 09:41 AM
EG4045-DE EG4045-DE View Details
$34.99
Buy Now · $34.99
Primary Arms
Primary Arms
Last Updated:
Sep 06, 2026 09:41 AM
4010-BK 4010-BK View Details
$24.99
Buy Now · $24.99
Primary Arms
Primary Arms
Last Updated:
Sep 06, 2026 09:41 AM
EG4009-BK EG4009-BK View Details
$22.99
Buy Now · $22.99
Primary Arms
Primary Arms
Last Updated:
Sep 06, 2026 09:41 AM
EG4009-DE EG4009-DE View Details
$22.99
Buy Now · $22.99
Primary Arms
Primary Arms
Last Updated:
Sep 06, 2026 09:41 AM
4996 4996 View Details
$23.24
Buy Now · $23.24
Primary Arms
Primary Arms
Last Updated:
Sep 06, 2026 09:41 AM
4373-3PK-BK 4373-3PK-BK View Details
$18.59
Buy Now · $18.59
Primary Arms
Primary Arms
Last Updated:
Sep 06, 2026 09:41 AM
4373-3PK-DE 4373-3PK-DE View Details
$18.59
Buy Now · $18.59
Primary Arms
Primary Arms
Last Updated:
Sep 06, 2026 09:41 AM
4970 4970 View Details
$12.08
Buy Now · $12.08
Primary Arms
Primary Arms
Last Updated:
Sep 06, 2026 09:41 AM
4988-3PK 4988-3PK View Details
$9.29
Buy Now · $9.29
Primary Arms
Primary Arms
Last Updated:
Sep 06, 2026 09:41 AM
EG4931 EG4931 View Details
$6.50
Buy Now · $6.50
Primary Arms
Shooting Surplus
Last Updated:
Sep 06, 2026 07:33 AM
ERGO 2 FLAT TOP AR15/AR10 GRIP KIT SUREGRIP - AMBI - BLK ERGO 2 FLAT TOP AR15/AR10 GRIP KIT SUREGRIP - AMBI - BLK View Details
$23.04
Buy Now · $23.04
Shooting Surplus