Castle Nut — Compare Prices Across Retailers

Loadout Combat Lab tracks 49 castle nut products across AR-15. Current observed prices run from $2.80 to $73.72, with top brands including V Seven, Fortis Manufacturing, Spike's Tactical, Strike Industries, BCM. Use this page to compare retailers, check category coverage, and move directly into matching product detail pages.

49 productsLow $2.80High $73.72

Top Products

Ranked by popularity, retailer coverage, and price competitiveness.

Strike Industries Enhanced Castle Nut

Strike Industries

Enhanced Castle Nut

Castle Nut

$11.355 retailers

Mil-Spec Standard Castle Nut

Mil-Spec

Standard Castle Nut

Castle Nut

$3.644 retailers

BCM Castle Nut

BCM

Castle Nut

Castle Nut

$8.643 retailers

Forward Controls Design CNF (Castle Nut, Forward Controls) — Black Nitride

Forward Controls Design

CNF (Castle Nut, Forward Controls) — Black Nitride

Castle Nut

$19.003 retailers

Fortis Manufacturing Fortis K2 System Locking Lever Castle Nut

Fortis Manufacturing

Fortis K2 System Locking Lever Castle Nut

Castle Nut

$32.953 retailers

V Seven V Seven Ultra-Light Aluminum Castle Nut

V Seven

V Seven Ultra-Light Aluminum Castle Nut

Castle Nut

$13.002 retailers

Daniel Defense

Daniel Defense Castle Nut (15-057-20039)

Castle Nut

$7.002 retailers

Magpul Magpul Mil-Spec Steel Castle Nut

Magpul

Magpul Mil-Spec Steel Castle Nut

Castle Nut

$4.952 retailers

Primary Weapons Systems PWS Ratchet Lock Castle Nut & Endplate Set (RLCN-KIT)

Primary Weapons Systems

PWS Ratchet Lock Castle Nut & Endplate Set (RLCN-KIT)

Castle Nut

$39.982 retailers

Aero Precision Aero Precision Receiver Extension Lock Nut

Aero Precision

Aero Precision Receiver Extension Lock Nut

Castle Nut

$8.992 retailers

Spike's Tactical Spike's Tactical Lightweight Chromoly Castle Nut (SLA501N-LW)

Spike's Tactical

Spike's Tactical Lightweight Chromoly Castle Nut (SLA501N-LW)

Castle Nut

$8.962 retailers

V Seven V Seven Titanium Castle Nut (Raw Ti)

V Seven

V Seven Titanium Castle Nut (Raw Ti)

Castle Nut

$73.722 retailers

Generic / Mil-Spec Standard Mil-Spec AR-15 Castle Nut

Generic / Mil-Spec

Standard Mil-Spec AR-15 Castle Nut

Castle Nut

$3.952 retailers

Phase 5 Phase 5 AR-15 Receiver Extension Castle Nut

Phase 5

Phase 5 AR-15 Receiver Extension Castle Nut

Castle Nut

$5.002 retailers

Midwest Industries MI AR Receiver Extension Lock Ring (M4BSTK-CN)

Midwest Industries

MI AR Receiver Extension Lock Ring (M4BSTK-CN)

Castle Nut

$5.002 retailers

VLTOR VLTOR Receiver Lock Nut (Castle Nut)

VLTOR

VLTOR Receiver Lock Nut (Castle Nut)

Castle Nut

$5.502 retailers

Spike's Tactical Spike's Tactical Mil-Spec Castle Nut (SLA501N)

Spike's Tactical

Spike's Tactical Mil-Spec Castle Nut (SLA501N)

Castle Nut

$6.952 retailers

BCM BCM Receiver Extension Nut (Castle Nut)

BCM

BCM Receiver Extension Nut (Castle Nut)

Castle Nut

$7.002 retailers

Noveske Rifleworks

Noveske N4 Parkerized Castle Nut

Castle Nut

$8.002 retailers

Seekins Precision Seekins Precision Mil-Spec Castle Nut

Seekins Precision

Seekins Precision Mil-Spec Castle Nut

Castle Nut

$8.002 retailers

Geissele Geissele Premium Mil-Spec Castle Nut

Geissele

Geissele Premium Mil-Spec Castle Nut

Castle Nut

$9.952 retailers

Battle Arms Development B.A.D. AR15/M16 Receiver Extension Nut

Battle Arms Development

B.A.D. AR15/M16 Receiver Extension Nut

Castle Nut

$11.002 retailers

Fortis Manufacturing Fortis Standard Castle Nut (7075 Aluminum)

Fortis Manufacturing

Fortis Standard Castle Nut (7075 Aluminum)

Castle Nut

$11.952 retailers

Strike Industries SI-AR-CN Standard Castle Nut

Strike Industries

SI-AR-CN Standard Castle Nut

Castle Nut

$13.952 retailers