Tombstone Tactical


Tombstone Tactical Logo

Tombstone Tactical


Knights Armament 31952 SR-15 Mod 2 Short-Barrel Rifle 5.56mm 11.5in 30rd Black MLok

Knights Armament 31952 SR-15 Mod 2 Short-Barrel Rifle 5.56mm 11.5in 30rd Black MLok for sale at Tombstone Tactical.
Manufacturer: Knights Armament
Part Number: 31952
UPC Number: 819064016021
Category: NFA Class 3 - Short-Barreled Rifles
Model: SR-15
Caliber: 5.56mm NATO
Action: Semi-Automatic
MSRP: $2596.16
MAP Price: $2596.16
Our Price: Add to Cart!

Out of Stock

Watch List

Knights Armament Short-Barreled Rifles for SR-15 models in 5.56mm NATO

Knights Armament 31952 SR-15 Mod 2 Short-Barrel Rifle 5.56mm 11.5in 30rd Black MLok

Knight's Armament SR-15 E3 CQB Mod2, 11.5"

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

Features include a 11.5 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, 10.75 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.

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


  • Knight's Armament SR-15 E3 CQB 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

All NFA Rules Apply

This item is restricted under NFA regulations. All NFA rules apply. Availability may be incorrect. Please place your order and our sales team will confirm your serial number prior to processing any payment.

Items shipping from the warehouse will need to transfer in to us first. This is usually a 3-4 week period, but can be subject to NFA availability and human error. Please exercise patience and understanding when ordering NFA items.

NFA items must be paid in full prior to initiating any transfers. Cancelled orders will be subject to a 50% restocking fee.

Availability: Out of Stock

We are not currently accepting back orders for this item. Please add the Knights Armament Short-Barreled Rifles for SR-15 models in 5.56mm NATO to your watch list to be notified when this item is available again.


Pricing and Payment Methods

Arizona residents are subject to 8.6% sales tax.

Shipping Requirements

This item is restricted under NFA laws. This item must be transferred to another licensed NFA dealer on a Form 3 or to an Arizona resident on a Form 4

When purchasing a firearm or other restricted item, federal law requires that it MUST ship to a licensed dealer in your state. If you need assistance locating a dealer to have your firearm shipped to, please contact us or enter your zip code at the GunBroker FFL dealer network website.

NOTICE: Flat rate and free shipping only applies to the contiguous US. AK, HI, and other territories will incur additional shipping fees. Not all items can legally ship to all 50 states. Please be sure this item is legal in your location before placing an order. If in doubt, please contact us.

NOTICE: Our inventory can change rapidly. While we make every attempt to make sure the information on our website is correct, we can not guarantee that inventory statuses, titles, pictures, or descriptions on our site are entirely accurate. We reserve the right to cancel any order, including, but not limited to, orders for items with errors in the inventory status, price, or description. In the event that an order is cancelled, we will not charge you and we will return funds if payment has been sent.

Tombstone Tactical
10011 N Metro Pkwy E.
Phoenix, AZ 85051

Tombstone Tactical

10011 N Metro Pkwy E