Gun Guys Emails
Our Newsletter
  • Home
  • Latest News
  • Tactical
  • Firearms
  • Videos
Reading: First Look: New AR-15 Uppers From SIG Sauer
Share
Search
Gun Guys EmailsGun Guys Emails
Font ResizerAa
  • News
  • Firearms
  • Tactical
  • Videos
Search
  • Home
  • Latest News
  • Tactical
  • Firearms
  • Videos
Have an existing account? Sign In
2025 © Gun Guy Emails. All Rights Reserved.
Tactical

First Look: New AR-15 Uppers From SIG Sauer

Wayne Park
Last updated: September 21, 2025 4:43 pm
Last updated: September 21, 2025 3 Min Read
Share
First Look: New AR-15 Uppers From SIG Sauer
SHARE

SIG Sauer is coming out with two new complete, drop-in AR-15 upper-receiver assemblies. These complete kits include everything you need to upgrade your AR lower.

MCX-SPEAR LT 9-inch Upper AR Conversion Kit 300BLK – FDE

The MCX-SPEAR LT developed for the Special Forces community and allows you to convert any AR15 lower into either an SBR with a stock and the appropriate paperwork or a large-format pistol with a brace.  

Features:

  • Adapts with any M4/AR15-spec lower assembly
  • Dual-rod recoil assembly eliminates buffer system
  • M4 adapter allows for picatinny rail folding stock capabilities
  • Adjustable gas system for suppressor optimization
  • Quick-change barrel design allows to easily swap calibers and barrel lengths
  • Gas-piston design reduces exposure to carbon fouling
  • Designed to go 20,000 rounds before any maintenance-part replacements
  • Ambidextrous charging handle with gas deflector
  • Replaceable parts (cam path follower, feed ramp, forward assist/deflector, charging handle locking pins) allow for longer receiver life over standard AR designs.
  • Tapered bolt design functions more reliably and lasts longer than standard square-lug M4 bolt designs.
  • Nitride coated, cold hammer forged barrel for more accuracy and barrel life

SIG AR Upgrade Kit

Upgrade your AR rifle or lower assembly with a complete, drop-in M400 upper assembly. This kit includes all the necessary components for a complete swap, including a two-stage match trigger as well as the popular Tango-MSR LPVO 1-6X24mm second focal plane (SFP) riflescope. The free-floating handguard uses a new steel lockup design that significantly reduces handguard deflection by providing maximum rigidity and allows for accessories to be attached on all four sides with no effect on accuracy. The 2-Stage Matchlite Duo trigger provides a crisp 4.5-6.5-pound pull weight with a flat blade design for a precision feel.

Included Items:

Complete 16-inch 5.56 NATO upper assembly
SIG 2-Stage Matchlite Duo trigger
Tango-MSR LPVO 1-6X24MM (SFP)

16-inch 5.56 NATO M400 Upper Assembly Features:

  • Black Anodized Finish
  • Three-prong flash-hider accepts SLH & SLX suppressor systems.
  • Dual-clamp handguard locking system for reduced deflection
  • Low-profile gas block with mid-length gas system
  • High-quality, premium barrel

Tango-MSR LVPO 1-6X24mm Features:

  • High-performance 6X optical system with low-dispersion glass
  • Integrated thread-in throw leaver for quick magnification changes
  • Illuminated MSR BDC-6 reticle with 11 brightness levels
  • Lay-flat, flip-back lens covers included
  • Dependable waterproof, shockproof, and fog-proof performance
  • Includes Alpha-MSR one-piece aluminum cantilever mount

MSRP for the MCX-SPEAR LT 9-inch Upper AR Conversion Kit is $1,699.99, and the MSRP for the SIG AR Upgrade Kit is $1,199.99. More information on these items and other products from SIG Sauer is available at sigsauer.com.

Read the full article here

Share This Article
Facebook X Email Copy Link Print
Leave a Comment Leave a Comment

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

News & Research

How to See What Premium Channels You’re Subscribed to On YouTube TV

Watch full video on YouTube

Tactical December 19, 2025

Trump administration targets Maduro’s inner circle, family in major narco-state crackdown

NEWYou can now listen to Fox News articles! The Treasury Department announced new sanctions Friday that target seven family members…

News December 19, 2025

Creating a SharePoint Site/Subsite

Watch full video on YouTube

Tactical December 19, 2025

Trump administration appeals ruling restoring $2.7B in federal funding to Harvard

NEWYou can now listen to Fox News articles! Lawyers for the Trump administration said Friday they are appealing a judge’s…

News December 19, 2025
  • Privacy Policy
  • Terms of use
  • Contact Us
  • 2025 © Gun Guy Emails. All Rights Reserved.
Welcome Back!

Sign in to your account

Username or Email Address
Password

Lost your password?