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Knight's Armament SR-15 SBR Carbine Mod 2, 14.5" Barrel, URX 4, M-LOK
Knight's Armament SR-15 SBR Carbine Mod 2, 14.5" Barrel, URX 4, M-LOK

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Our Price: $2,596.16

Quantity in Stock:(Out of Stock)
Product Code: 31946


Knight's Armament SR-15 E3 SBR Mod2, 14.5"

*NFA rules apply, must ship to an FFL dealer with an SOT.

The Knight's Armament SR-15 IWS E3 Mod 2 SBR may be based on the Eugene Stoner designed operating system but the similarities nearly end there.

Features include a 14.5 inch chrome lined, 5.56mm NATO barrel that is manufactured to military specifications. Attached to the muzzle is the Knight's Armament 3 prong flash hider. New on the Mod 2 is a proprietary mid-length gas system that increases reliability and durability while also reducing felt recoil. The gas block no longer uses taper pins or set screws but is held on by a castle nut which allows for an air tight seal. Keeping with the air tight theme, the unique gas tube uses a compression fitting where it meets the gas block. This is very similar to what is used in automotive hydraulic brake lines. With these two features you won't have to worry about gas system leakage which can cause malfunctions, especially with lower powered ammo.

On the opposite end of the barrel is Knight's Armament's proven E3 round-lug bolt which both enhances function and increases bolt life far beyond the industry standard. The bolt is desigend to outlive the barrel. The E3 bolt rides in a full auto carrier.

Surrounding the barrel is Knight's new URX 4 M-LOK handguard, 13 inches in length. The extended length handguard allows for a forward grip which makes moving from target to target much faster. The M-LOK handguard will accept all standard M-LOK accessories such as hand stops, rail covers, light mounts or picatinny rail sections. One 5 slot picatinny M-LOK rail section is supplied with the rifle. The URX 4 handguard design increases cooling characteristics and reduces weight and bulk compared with standard 1913 rail attachment methods.

An ambidextrous bolt release, selector, and magazine release offer left-handed users the ergonomic advantages inherent to AR15-based controls, as well as giving right-handed users alternative methods of manipulation to increase efficiency of movement. The drop-in two-stage trigger serves double duty as an aid to long range precision marksmanship while enabling surgical speed shooting at close range. Included parts and features, such as the two-sided receiver end plate QD sling swivel mounting point, collapsible six-position SOPMOD stock, hybrid ambidextrous selector lever, and folding 200-600 meter sights, round out the package to deliver a cutting-edge carbine right out of the case.


  • Knight's Armament SR-15 E3 14.5" SBR Rifle
  • (7)M-LOK rail panels, black
  • GI aluminum 30 round magazine with Knight's Armament follower (where legal)
  • 5 slot picatinny M-LOK rail section
  • Knight's Armament logoed padded hard case
  • (2) KAC QD sling swivels
  • Magwell block with lock
  • Owner's manual


Average Rating: Average Rating: 5 of 5 5 of 5 Total Reviews: 4 Write a review »

  0 of 0 people found the following review helpful:
5 of 5 Love the rifle to bits May 1, 2020
Reviewer: Mason from Bethel, MN United States  
Charlie did an awesome job on the pin/weld and could not be happier with the overall purchase. Thanks again

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  0 of 0 people found the following review helpful:
5 of 5 Knights Armament 14.5 pinned April 27, 2020
Reviewer: Brian Todd from NC, United States  
Charlie at Small Arms Sales is awesome!  He is great to work with and did a great job on my pinned and welded Sr15

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  0 of 0 people found the following review helpful:
5 of 5 Great Company November 2, 2018
Reviewer: Anonymous Person from Tamuning , GU United States  
Customer service was outstadaning. I will be back for future purchases. There was a shipping issue that was the postal services fault and Charlie took the time to make it right. The pin and weld job is perfect.

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  0 of 0 people found the following review helpful:
5 of 5 Excellent product and customer service April 17, 2018
Reviewer: David England from United States  
I wish I had tried Knight’s Armament sooner. I want more. This is definitely a top tier company and a top tier rifle. Everything from the fit and finish to the tuning of the system is superb. When I buy more KAC it will be from Smallarmsales.com and operationparts.com they were extremely helpful and had great communication. I couldn’t ask for better service.

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