Forward Controls Design CNF and ESF-H1 Hardware Pair

Stakable FCD CNF castle nut paired with the steel ESF-H1 rear-QD end plate for a carbine receiver extension.

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Quick Specs

Price: $71
Weight: N/A
Brand: Forward Controls Design
Category: gas-component

Features

•CNF 4140 PH steel castle nut
•Four 30-degree staking notches
•ESF-H1 4140 steel end plate
•Rear-facing QD socket
•Two separately sold parts

Compatibility Tags

family: ar-patternpart: recoil-mounting-hardwarerecoil-system: carbine

Overview

This configured pair combines Forward Controls Design's CNF castle nut with its ESF-H1 end plate. The CNF uses four 30-degree staking notches, while the steel ESF-H1 adds a single rear-facing QD socket. FCD sells the two pieces separately, so both product links are required.

Key Features

Four deep, shallow-angle staking notches on the CNF
Single rear-facing QD socket on the ESF-H1
Steel construction for both pieces
Conventional torque-and-stake retention

Pros

+Purpose-built staking geometry
+Compact rear-facing sling socket
+Both pieces support a conventional staked installation

Cons

−Two separate purchases
−Costs much more than plain mil-spec hardware
−QD housing can limit access for some three-lug wrenches

Detailed Specifications

included: Configured pair; CNF and ESF-H1 are sold separately
castleNut: CNF, 4140 PH steel, black nitride, four 30-degree staking notches
endPlate: ESF-H1, 4140 steel, black DLC, one rear-facing QD socket
endPlateWeight: 0.50 oz
compatibility: AR-platform carbine receiver extensions
installation: Conventional torque-and-stake installation
partNumbers: CNF and ESF-H1