Knights Armament 116858 SR-25 Black Lower Receiver Assembly

The Knight’s Armament SR-25 Lower Receiver Assembly brings military-grade engineering and precision to your next AR-10 style build. Designed for serious shooters and precision rifle builders, this semi-complete lower receiver mirrors the same combat-proven architecture trusted by elite military units worldwide.

Crafted from premium materials and coated in a durable black finish, this SR-25-compatible lower offers full ambidextrous controls—including the bolt release, magazine release, and selector switch—giving you ergonomic flexibility regardless of shooting style or dominant hand.

Key Features

Combat-Proven Design

• Direct commercial offering based on KAC’s military-contract lowers

• Compatible with SR-25/AR-10 upper receivers in 7.62 NATO/.308 Win

Ambidextrous Control Suite

• Integrated ambi bolt catch/release, mag release, and safety selector

• Ideal for tactical applications, competition, or left-handed shooters

Enhanced Trigger System

• Factory-installed Knight’s drop-in two-stage trigger

• Provides a crisp, predictable break ideal for precision shooting

High-Quality Components

• Includes A2 pistol grip

• Equipped with buffer tube (stock not included)

• Black anodized finish for wear resistance and durability

Specifications

• Caliber: 7.62 NATO / .308 Winchester

• Platform: AR-10 / SR-25

• Type: Semi-automatic lower (semi-complete)

• Controls: Fully ambidextrous (bolt, mag, selector)

• Trigger: Knight’s Two-Stage Drop-In

• Grip: A2 Pistol Grip

• Stock: Not included (buffer tube installed)

• Finish: Black

• Firearm Fit: SR-25 Compatible Uppers