Knight's Armament SR-15 E3 Mod 2 M-LOK

Legacy SR-15 E3 Mod 2 M-LOK rifle with KAC bolt, gas, and URX4 upgrades.

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Key Highlights

•Match-grade accuracy with military durability
•Proprietary E3 bolt design

Specifications

Price: $2,899
Weight: 6 lb 8.799999999999997 oz
Calibers: 5.56mm NATO
Rail Type: mlok
Best For: duty patrol competition outdoor defense

Capability Profile

0-10 Scale Across 8 Axes

Compatibility Tags

family: modern-riflefamily: ar-patterntrigger: ar-fcginterface: picatinny-tophandguard: mlokbarrel: longmag-type: stanagthread: 1/2x28

Overview

The Knight's Armament SR-15 Mod 2 represents the evolution of Eugene Stoner's original design, featuring KAC's proprietary E3 bolt system with enhanced durability and reliability. With a 16-inch chrome-lined barrel and URX 4 M-LOK handguard, it's regarded as one of the finest fighting carbines available.

Key Features

E3 enhanced bolt with rounded lugs for 5x service life
16" chrome-lined hammer-forged barrel
URX 4 M-LOK free-floating handguard
Ambidextrous controls (bolt release, safety, mag release)
Two-stage match trigger
3-prong flash eliminator
Improved extended gas system for reliability

Pros

+Exceptional reliability (20,000+ rounds without cleaning in tests)
+E3 bolt design vastly superior to mil-spec
+Consistent 1 MOA accuracy even after heavy use
+Premium ambidextrous controls
+Smooth extended gas system operation
+Military-proven design and quality

Cons

−Premium price and collector-market volatility
−Limited availability due to production constraints
−Some military users report mixed experiences with 7.62 variants
−Full-auto meltdown performance questioned by some testers

Detailed Specifications

sku: 31900
caliber: 5.56mm NATO
Barrel Length: 16"
Overall Length: 33.5" - 36.5"
weight: 6.55 lbs
Gas System: Direct impingement with KAC Mod 2 gas system
railSystem: M-LOK (URX 4)
Trigger: Two-stage match
Twist Rate: 1:7
barrel: Hammer-forged, chrome-lined
Muzzle Device: KAC 3-prong QDC flash eliminator
status: Legacy Mod 2 configuration; current KAC commercial SR-15 lineup has moved to KS-series carbines