Knights Armament AR-15 Upper Receiver Carbine Mod 2 14.5" Urx 4 M-LOK
Click to see full view
Knights Armament
Overview
The Knights Armament AR-15 Upper Receiver Carbine Mod 2 features a stripped assembly designed for builders looking to create a lightweight yet robust upper. With a barrel length of 14.5 inches and a carbine gas system, this upper is optimized for 5.56 NATO caliber ammunition, offering a twist rate of 1:7 that enhances stability and accuracy with a wide range of bullet weights. This upper receiver commonly appears in builds that prioritize maneuverability and versatility, making it ideal for tactical applications or lightweight setups.
Specifications
Knights Armament AR-15 Upper Receiver Carbine Mod 2 14.5" Urx 4 M-LOK
Build history on GunPartPicker
Builders have been adding the Knights Armament AR-15 Upper Receiver Carbine Mod 2 14.5" Urx 4 M-LOK to their builds on GunPartPicker since February 2026. All time, it ranks #331 of the 1,893 upper receivers builders have added. Builds with this upper receiver are nearly all chambered in 5.56 NATO, nearly all on carbine-length gas, and nearly all AR-15.
It was out of stock everywhere we track for all of October 2026, and today none of the 2 retailers we track has it in stock right now. Listed prices start at $1,989.16 at Brownells for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
Not sure which upper receiver to pick?
We ranked every upper receiver by how often it shows up in real builds on GunPartPicker.
Read the guide: Most Popular AR-15 Upper Receivers →Check it against the live catalog:
Frequently Built With
The part most often added in each category by the builds that include this one
Knights Armament Sr-15 Iws Lower Receiver Complete
Geissele Automatics AR-15 SSA-E X Lightning Bow Trigger
B5 Systems SOPMOD Enhanced Stock, Multi-Camo Black - SOP-1422
EOTECH XPS2 Holographic Sight, Tan - XPS2-0TAN
SureFire Remote Dual Switch for Weaponlight and ATPIAL Laser Device
SureFire M640U Scout Light PRO Weapon Light - 1000 Lumens - Tan
No reviews yet. Be the first to review this product!