Sig Sauer MCX for sale
(12)
SIG SAUER MCX SPEAR LT RIFLE
Brand:
Sig Sauer
Action:
Semi-Auto
Barrel Length:
16in
Caliber:
5.56×45mm NATO
Capacity:
30
Finish Per Color:
Coyote / Black
(0)
Sig Sauer MCX Rattler LT Pistol 7.62 X 39 7.75" Barrel 28-Rounds
Action:
Semi-Auto
Barrel Length:
7.75"
Caliber:
7.62x39mm
Capacity:
28+1
Finish Per Color:
Black
(0)
Sig Sauer RSPEAR6816BNG MCX Spear 6.8x51 20+1 16" Coyote Anodized Folding Telescoping Magpul SL-M Polymer Grip
Brand:
Sig Sauer
Action:
Semi-Auto
Barrel Length:
16"
Caliber:
6.8mm Remington SPC
Capacity:
20+1
Finish Per Color:
Coyote
(5)
SIG SAUER MCX SPEAR LT PISTOL
Brand:
Sig Sauer
Action:
Semi-Auto
Barrel Length:
11.5" Carbon Steel
Caliber:
7.62x39mm
Capacity:
28
Finish Per Color:
Coyote / Black
(0)
Sig Sauer MCX SPEAR 7.62x51mm NATO 13" 1:10" Bbl Coyote Brown Optic Ready Pistol w/(1) 20rd Magazine PSPEAR-762-13B
Brand:
Sig Sauer
Action:
Semi-Auto
Barrel Length:
13 inches
Caliber:
.308 Win
Capacity:
20+1
Finish Per Color:
Coyote Tan
(0)
Sig Sauer MCX Rattler LT Pistol 5.56 7.75" Barrel 30-Rounds
Action:
Semi-Auto
Barrel Length:
7.75"
Caliber:
5.56×45mm NATO
Capacity:
30+1
Finish Per Color:
Black
(1)
SIG SAUER MCX SPEAR
Brand:
Sig Sauer
Action:
Semi-Auto
Barrel Length:
16in
Caliber:
7.62x51mm NATO
Capacity:
20
Finish Per Color:
Coyote Tan
(8)
Sig Sauer Mcx, Sig Pmcx-556n-11b-lt 5.56 Nat 11.5 30rd Coy And
Brand:
Sig Sauer
Action:
Semi-Auto
Barrel Length:
11.5" Carbon Steel
Caliber:
5.56×45mm NATO
Capacity:
30+1
Finish Per Color:
Coyote / Black
(0)
Sig Sauer MCX SPEAR-LT Black 5.56 / .223 Rem 16" Barrel 30-Rounds
Brand:
Sig Sauer
Action:
Semi-Auto
Barrel Length:
16"
Caliber:
.223 Rem
Capacity:
30
Finish Per Color:
Black
(0)
Sig Sauer SIG MCX 5.56 Nato Pistol Semi 5.5in Bbl NO BRACE Al MLOK Hg (1) 30 Rd Mag Rattler Pistol PMCX-5B-TAP-NB
Brand:
Sig Sauer
Action:
Short-stroke recoil gas piston operating system
Barrel Length:
5.5 inches
Caliber:
5.56×45mm NATO
Capacity:
30
Finish Per Color:
Black
(0)
Sig Sauer MCX-R Regulator Coyote Brown 5.56 16" Barrel 10-Rounds w/ Romeo2 Red Dot
Action:
Semi-Auto
Barrel Length:
16"
Caliber:
5.56×45mm NATO
Capacity:
10
Finish Per Color:
Coyote Brown
(0)
Sig Sauer MCX Spear-LT IR Flat Dark Earth 5.56 / .223 Rem 16" Barrel 28-Rounds
Action:
Semi-Auto
Barrel Length:
16"
Caliber:
5.56×45mm NATO
Capacity:
28+1
Finish Per Color:
Flat Dark Earth
(0)
Sig Sauer MCX-R Regulator Coyote Brown 5.56 16" Barrel 10-Rounds
Action:
Semi-Auto
Barrel Length:
16"
Caliber:
5.56×45mm NATO
Capacity:
10
Finish Per Color:
Coyote Brown
(0)
Sig Sauer MCX Spear-LT Pistol MultiCam 5.56 / .223 Rem 11.5" Barrel 30-Rounds
Brand:
Sig Sauer
Action:
Semi-Auto
Barrel Length:
11.5"
Caliber:
5.56×45mm NATO
Capacity:
30
Finish Per Color:
MultiCam
(0)
Sig Sauer MCX Rattler LT .300 BLK 6.75" 1:5" CHF Bbl Black Pistol w/(1) 30rd Mag PMCX-300B-6B-LT-PCB
Action:
Semi-Auto
Barrel Length:
6.75"
Caliber:
.300 AAC Blackout
Capacity:
30+1
Finish Per Color:
Black
(0)
Sig Sauer MCX-R Regulator Coyote Brown 7.62 X 39 16" Barrel 10-Rounds
Action:
Semi-Auto
Barrel Length:
16"
Caliber:
7.62x39mm
Capacity:
10
Finish Per Color:
Coyote Brown
(0)
Sig Sauer MCX SPEAR 7.62x51mm NATO 13" 1:10" Bbl Coyote Brown Optic Ready Short Barrel Rifle w/(1) 20rd Magzine (NFA) RSPEAR-762-13B-SBR
Brand:
Sig Sauer
Action:
Semi-Auto
Barrel Length:
13
Caliber:
.308 Win
Capacity:
20
Finish Per Color:
Coyote Brown
(0)
Sig Sauer MCX Rattler LT SBR 5.56 / .223 Rem 7.75" Barrel 30-Rounds
Action:
Semi-Auto
Barrel Length:
7.75"
Caliber:
5.56×45mm NATO
Capacity:
30+1
Finish Per Color:
Black
(0)
Sig Sauer PMCX-300B-5B-TAP-CAN-BN-NB MCX Canebrake Coyote Tan/Black 300 Blackout 5.5
Brand:
Sig Sauer
Action:
Semi-Auto
Barrel Length:
5.5 inches
Caliber:
.300 AAC Blackout
Capacity:
30
Finish Per Color:
Coyote / Black
(0)
SIG SAUER MCX RATTLER PISTOL .300 AAC BLACKOUT 5.5" 30RD BLACK NB
Brand:
Sig Sauer
Action:
Semi-Auto
Barrel Length:
5.5 inches
Caliber:
.300 AAC Blackout
Capacity:
30
Finish Per Color:
Black
(0)
SIG Sauer MCX Rattler PCB .300 AAC Blackout in Black
Brand:
Sig Sauer
Action:
Semi-Auto
Barrel Length:
5.5"
Caliber:
.300 AAC Blackout
Capacity:
30
Finish Per Color:
Coyote / Black
(0)
Sig Sauer MCX Spear-LT IR Coyote Brown .300 AAC Blackout 9" Barrel 30-Rounds
Brand:
Sig Sauer
Action:
Semi-Auto
Barrel Length:
9"
Caliber:
.300 AAC Blackout
Capacity:
30
Finish Per Color:
Coyote Brown
(0)
Sig Sauer MCX Spear SBR Coyote Brown .277 Fury / 6.8x51mm 13" Barrel 20-Rounds
Brand:
Sig Sauer
Action:
Semi-Auto
Barrel Length:
13"
Caliber:
.277 Sig Fury
Capacity:
20+1
Finish Per Color:
Coyote Brown
Marketplace Insights
★ 4.8/5
based on 32 customer reviews across 51 variants from 40 retailers
Exceptional piston-driven rifle with outstanding accuracy, reliability, and craftsmanship that represents a significant improvement over the Virtus platform.
What customers like
Accuracy & Reliability50%
very accurate, very reliable, well made
Quality & Craftsmanship44%
The craftsmanship is impeccable for a civilian weapon
Improvement Over Virtus22%
A genuine improvement over the Virtus
Ergonomics & Handling19%
balance is spot on making it easy to maneuver and shoot
Trigger Performance16%
Excellent 2 stage trigger that doesn't need replacing
Common concerns
Handguard Movement Issue3%
front hand guard will twist and move side to side
Frequently Asked Questions
Sig Sauer MCX for sale
Is the SIG Sauer MCX a good gun?
"Good" depends on your needs. The MCX is praised for reliability, ergonomics, and accuracy. It costs more than standard AR-platform rifles, with prices around $2,500 across 51 variants. Handling one before purchasing helps determine whether its design advantages justify the premium for your intended use.
Why is the SIG MCX-SPEAR so expensive?
SIG MCX-SPEAR rifles typically cost around $4,100 due to their short-stroke piston system, integrated recoil management, folding stock, and extensive modularity. Engineering a proprietary platform rather than using standard AR components drives manufacturing costs higher than conventional rifles.
Can a civilian own a SIG MCX spear?
Yes, civilians can own the SIG MCX-SPEAR. It is the semi-automatic civilian version of the Army's XM7 rifle, chambered in calibers including 6.8x51, 7.62x51, and others. It is commercially available through licensed firearms dealers, typically priced around $2,500.
How much does the MCX rattler cost?
The MCX Rattler typically costs around $2,514, with prices ranging from $2,350 to $2,540 depending on caliber and configuration. SIG offers it in 5.56 NATO and .300 AAC Blackout. A Rattler Canebrake variant is also available at $3,430.
Is the Sig Spear LT worth it?
Worth it depends on your priorities. At around $2,500, it excels for suppressed shooting and piston-driven reliability. It outperforms standard AR-15s in those roles, but cheaper alternatives work fine for general-purpose use. Best justified for tactical or defense-focused builds.
What is the difference between Sig Spear and Spear LT?
The Spear LT lacks a receiver extension; instead, the rear of the receiver features a short 1913 rail for mounting a folding stock. It also has a lighter handguard and barrel than the standard Spear. Both share the same piston operating system and caliber options.
What caliber is the SIG MCX-SPEAR LT?
The SIG MCX-SPEAR LT is available in 5.56x45mm, 300 AAC Blackout, and 7.62x39mm.
Did SIG discontinue the MCX regulator?
The MCX Regulator is a current SIG Sauer product, introduced as new for 2024 with an MSRP of $2,999–$3,499. It is actively available through retail dealers. Check our marketplace for current listings alongside other MCX variants like the SPEAR and RATTLER lines.
Is the MCX VIRTUS discontinued?
SIG Sauer replaced the MCX Virtus with the MCX-SPEAR and MCX-SPEAR LT lines, effectively ending Virtus production. Used inventory remains available through secondary markets, with 51 variants currently listed across 40 retailers, 43 in stock, typically priced around $2,514.
What calibers does the SIG MCX Virtus come in?
The SIG MCX Virtus is available in 5.56 NATO and .300 AAC Blackout. The platform's modular design allows barrel and bolt swaps between these two calibers.
What does MCX stand for?
MCX stands for Mission Configurable eXchange, reflecting the SIG Sauer rifle's modular design that allows quick barrel and caliber changes. In other contexts, MCX refers to the Multi Commodity Exchange of India or a membership warehouse retail chain.
How much does a SIG rattler LT cost?
The SIG Rattler LT typically costs around $2,500–$2,700, with prices ranging from roughly $2,200 to $4,200 depending on caliber and configuration. The 300 Blackout version runs closer to $2,700. Availability varies across retailers.
Is the Rattler LT reliable?
User reviews report high reliability across thousands of rounds, with the MCX Rattler LT cycling both supersonic and subsonic ammunition without issue. Its short-stroke piston system contributes to consistent performance among civilian and professional users.
Can you swap lowers on the MCX regulator?
Yes. The MCX upper can mate with standard AR-pattern lowers, though slight profile mismatches may cause minor overhang. SIG also sells dedicated MCX lowers. Aftermarket options like the FightLite SCR lower exist. Always verify compatibility before purchasing.
How much is the SIG MCX regulator?
The SIG MCX Regulator typically costs around $2,800 to $3,300, with listings seen at prices such as $2,799.99, $3,039.99, and a list price of $3,278 depending on configuration. We track 51 variants across 40 retailers, with 43 currently in stock.