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SIONICS 14.8″ Pin & Weld Premium Upper Receiver Group – S-15 Rail

from: $93495

Introducing the SIONICS Premium Upper Receiver Groups, engineered for unparalleled precision and unwavering rigidity. These URG’s showcase our groundbreaking S-15 RM-Lok handguard, available in both Arca and non-Arca configurations. Beyond the innovative handguard, each URG undergoes a meticulous thermal-fit barrel installation, guaranteeing exceptional accuracy. Whether you’re building a dedicated precision rifle or demanding the utmost stability in a tactical carbine, SIONICS delivers the pinnacle of performance.

If you would like to use your own Muzzle Device, please email sales@sionicsweaponsystems.com and you will receive instructions for mailing. 

Estimated Completion Date June 6, 2025 - June 11, 2025
SKU: 148-PW-URG-S15 Category: Product ID: 28481

Description

Base Configuration

Upper Receiver: 7075 M4 AR15 Style 5.56mm NATO – Premium Thermal Fit w/ Dowel Pin
Barrel: SIONICS 14.8″ Barrel –  41V50, 5.56 NATO Chamber, 1:7, Chrome Lined, Air-Gauged, Radiograph and MP Inspected
Gas System: Mid-Length – Direct-Impingement
Muzzle Device: SIONICS A2 Style Flash Hider
Handguard: 14.125″ or 15″ S-15 Non-Arca or S-15 Arca 

Weights with BCG, Radian Raptor Charging Handle, and Standard A2 Birdcage (no iron sights):

Non-Arca: 4lb 7oz
Arca: 4lb 11oz

Optional Installed Add-Ons:

Bolt Carrier Group: SIONICS Phosphate Coated BCG or SIONICS NP3 Coated BCG
Charging Handle: Radian Raptor Ambidextrous Charging Handle
Iron Sights: Magpul MBUS or Magpul MBUS Pro

Our ‘in-stock’ status reflects component availability; however, due to our customization options, all firearm, URG, and Lower Receiver builds are made to order. Our standard lead time is 4-8 weeks or specified under the add to cart button or in the issued invoice after the item has been ordered. We strive to deliver your custom build as quickly as possible, often ahead of schedule.

The Pin and Weld will bring this upper to the required 16″ OAL for NFA requirements.