Description

The MCX SPEAR LT developed for the SF community is the most advanced platform of its kind. Convert any M4/AR15 platform into a modernized folding firearm with superior reliability, durability, and accuracy.

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 Part Exposure to Carbon Fouling
-Designed to go 20k rounds before any maintenance part replacements
-SLX/SLH Next Gen Suppressor Designed QD Flash Hider for Clutch-Lok Adaptability
-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 optimal accuracy and barrel life

Included items:

Complete 9" 300BLK upper assembly includes our removable 3-prong flash-hider ready to accept our SLH & SLX suppressor systems.
Receiver extension delete stock adapter so you may mount any folding or static stock or brace that uses a vertical 1913 rail system.

Explore more Uppers Sig Sauer deals.

Rebates for Sig Sauer brand

Exp. date: 01.09.2026
Buy a New Applicable SIG SAUER Handgun Between 06/01/26 and 08/31/26, Receive One (1) SIG SAUER FOXTROT-EDC COMPACT Flashlight. (SKU: SOFEC002)
*Purchases of all SIG SAUER P365, P320, M17-M18, P210, P211, P220, P226, P229 and 1911 models are included in this offer. All other SIG SAUER Handguns are excluded from this promotion.

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Compare prices for 798681682522 - Sig Sauer MCX-Spear LT Upper/Conv. Kit UAMCX-300B-9B-LT-BLK from all vendors

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$1,524.46
Shipping from 19.99 and no credit card or handling fees. We collect sales tax for Indiana customers.
$1,528.28
Shipping from $14.99, no tax outside WI, no BS fees
$1,559.61
8.95
$1,560.76
Calculated in Cart
$1,565.11
Calculated in Cart
$1,566.57
Calculated in Cart
$1,570.10
$8 Flat Rate Shipping | Free Shipping over $200 | Free Shipping on ALL Firearms and Suppressors!
$1,571.99
14.84
$1,580.00
19.95
$1,588.99
FREE SHIPPING | NO SALES TAX/FEES
$1,590.00
Free Shipping
$1,626.09
Handguns $39.99, Long guns $19.99, Ammo $16.99, Accessories $16.99
$1,626.09
19.95
$1,647.99
19.95
$1,649.99
no info
$1,688.22
12.00
$1,699.98
Ships Fast, most items ship for $9.99-19.99, No CC or Firearm Fees
$1,699.99
no info
$1,699.99
Most orders ship within 24-48 hours. Most non-ammunition items ship for $9.99–$19.99. No credit card fees.
$1,706.99
$14.95 Handguns / $24.95 Long Guns
$1,720.99
Calculated In Cart
$1,739.00
FREE Shipping on most orders over $49, $9.99 Flat rate shipping on Ammo
$1,742.24
Calculated in Cart
$1,749.99
Free Shipping Over $200
$1,771.99
See price at checkout
$1,814.84
19.99
$1,814.95
$9.95 shipping on Firearms, No CC Fees
$1,818.99
no info
$1,844.99
no info
$1,871.15
$29.99 Handguns, $39.99 Long guns, $19.99 Ammunition, $19.99 Suppressor, $12.95 Everything else
$1,939.12
No shipping charge for orders over over $75
$2,032.99
Firearms & Suppressors $19.99 | Accessories $14.95 - $19.99
$2,226.20
10.00
$2,739.38
45.00
Out Of Stock
$1,669.65
$9.99
$1,709.73
$19.99
$1,839.74
$14.95
$1,960.99
8.95
$1,989.99
Shipping calculated in cart
$1,999.99
FREE Shipping over $250, Firearms $13.95 flat rate S/H

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