5.56x45mm Sig Sauer Guns for Sale

Price History
5.56x45mm
Sig Sauer
SIG SAUER M400 RIFLE - RIFLE: SIG SAUER MODEL M400 RIFLE, SERIAL NUMBER 20C072303, BLACK (MATTE), YES - INCLUDES ORIGINAL BOX, SEMI - AUTOMATIC, 5.56 NATO, 16 Notes: SIG SAUER M400 - 5.56 NATO PERFORMANCE **SIG SAUER M400 - 5.56 NATO - SEMI-AUTO RIFLE** * Caliber: 5.5...
Used
Shipping $28
$699.99 Guns.com ★★★★★ (38,455)
SIG SAUER SIGM400 - The M400 TREAD comes ready for the range and ready to be customized. TREAD features a 16" stainless steel barrel with a free-floating M-LOK handguard, a single-stage polished/hard-coat trigger, ambidextrous controls, a Magpul(TM) SL-K 6 position telesc...
Used
Shipping $30
$749.99 Guns.com ★★★★★ (38,455)

5.56x45mm Sig Sauer Guns Price Graph

Today's 5.56x45mm Sig Sauer Guns average is $911.17, 3% below the 180-day average of $936.60. Over the last 180 days, the average peaked at $968.18 on June 16, 2026 and bottomed at $910.01 on April 7, 2026.

SIG SAUER M400 RIFLE - RIFLE: SIG SAUER MODEL M400 RIFLE, SERIAL NUMBER 20L029597, BLACK (MATTE), YES - INCLUDES HARD PROTECTIVE CASE, SEMI - AUTOMATIC, 5.56 NATO, 16" Notes: Sig Sauer M400 Tread 5.56 NATO Rifle. Comes with one magazine. 16" Stainless Barrel 1/8 Twist
Used
Shipping $32
$799.99 Guns.com ★★★★★ (38,455)
SIG SAUER SIGM400 - Manufacturer: Sig SauerImporter: Sig SauerModel: SIGM400Type: RifleAction Type: Semi-AutomaticCaliber / Gauge: 5.56 x 45 MM natoFinish: BlackBarrel Type: SingleBarrel Length: 16"Magazine Capacity: 30-39Condition: Used
Used
Shipping $32
$799.99 Guns.com ★★★★★ (38,455)
SIG SAUER M400 TREAD - RIFLE: SIG SAUER MODEL M400 TREAD Notes: SIG SAUER MODEL M400 TREAD BLACK (MATTE) COMES W/ ONE 5 RND MAG SEMI - AUTOMATIC 5.56 NATO 16" - BJB (47927)
Used
Shipping $34
$849.99 Guns.com ★★★★★ (38,455)
SIG SAUER SIGM400 RIFLE - RIFLE: SIG SAUER MODEL SIGM400 RIFLE, SERIAL NUMBER 20L023584, CAMOUFLAGE, YES - INCLUDES PROTECTIVE CASE, SEMI - AUTOMATIC, 5.56 NATO, 21 1/2 Notes: SIG SAUER SIGM400 SEMI-AUTOMATIC RIFLE Manufacturer: SIG Sauer Model: SIGM400 Serial Number: 20...
Used
Shipping $34
$849.99 Guns.com ★★★★★ (38,455)
SIG Sauer M400 TREAD 5.56 NATO Rifle, 10-Round
New
UPC 798681715282 Shipping $33.11
$864.83 Deerford Defense
RRA LEF-T CAR A4 CARBINE 5.56 16" BBL 6 POS NO SIGHTS BLK
New
UPC 842834109951 Shipping $20
$868.40 DK Gun & Dog ★★★★★ (56)
SIG M400 TREAD 5.56 NATO 16" - S/S M-LOK HG 10RD BLACK
New
UPC 798681715282 Free Shipping
$870.99 Cummings Family Firearms ★★★★★ (52)
Sig Sauer RM40016BTRD M400 Tread 5.56x45mm NATO 16" 30+1 Black Hard Coat Anodized Black 6 Position Magpul SL-K Stock Black Polymer Grip
New
UPC 798681597765 Free Shipping
$873.48 Gman Sporting Arms

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SIG SAUER SIGM400 RIFLE - RIFLE: SIG SAUER MODEL SIGM400 RIFLE, SERIAL NUMBER 20L230687, GREEN, YES - INCLUDES PROTECTIVE CASE, 16", 5.56 NATO, SEMI - AUTOMATIC Notes: The Sig Sauer SIGM400 is a high-performance rifle designed for reliability and versatility. Chambered in...
Used
Shipping $35
$874.99 Guns.com ★★★★★ (38,455)
SIG SAUER SIGM400 - semi-automatic rifle chambered in 5.56 NATO with a 16-inch barrel. This rifle features a free-float M-LOK handguard, flat-top Picatinny upper receiver, adjustable Magpul stock, and SIG Sauer polymer grip. Features: Manufacturer: SIG Sauer Model: SIGM...
Used
Shipping $35.24
$880.99 Guns.com ★★★★★ (38,455)
SIG SAUER SIGM400 - Description The Sig Sauer M400 Forge is a premium 5.56 NATO modern sporting rifle built for shooters who demand accuracy, consistency, and refined ergonomics. Its cold hammer forged steel barrel with FNC finish provides exceptional durability and repe...
Used
Shipping $35.44
$885.99 Guns.com ★★★★★ (38,455)
SIG M400 TREAD 5.56 NATO 16 V2 BLK TELE MLOK 10R
New
UPC 798681715282 CC Fee 3%
$885.99 Cornerstone Arms ★★★★★ (373)
SIG M400 TREAD 5.56 NATO 16" - S/S M-LOK HG 10RD BLACK
New
UPC 798681715282 CC Fee 6%
$897.13 All Things Firearm ★★★★★ (3)
Sig Sauer PM400-11B-TRD-V2 M400 Tread V2 5.56 NATO 11.5" Barrel, M-LOK Handguard, Magpul BSL
New
UPC 798681698950 Free Shipping
$899.00 Bereli ★★★★★ (1,013)
Hexium 5.56mm TI HUB Direct Thread
New
UPC 798681731671 Free Shipping
$899.99 Timber Hole Outdoors ★★★★★ (5)
SIG HEXIUM 5.56MM INC DIRECT THREAD
New
UPC 798681731688 Free Shipping
$899.99 Timber Hole Outdoors ★★★★★ (5)
SIG HEXIUM 5.56MM TI DIRECT THREAD
New
UPC 798681731671 Free Shipping
$899.99 Garrison's Guns ★★★★★ (21)
SIG RIFLE SUPPRESSOR 5.56 NATO - INCONEL HUB DIRECT THREAD BLK
New
UPC 798681731688 Free Shipping
$899.99 Kinetic Armory ★★★★★ (3)
SIG RIFLE SUPPRESSOR 5.56 NATO - INCONEL HUB DIRECT THREAD BLK
New
UPC 798681731688 Free Shipping
$899.99 Garrison's Guns ★★★★★ (21)
SIG RIFLE SUPPRESSOR 5.56 NATO - INCONEL HUB DIRECT THREAD BLK
New
UPC 798681731688 Free Shipping
$899.99 Cummings Family Firearms ★★★★★ (52)
SIG RIFLE SUPPRESSOR 5.56 NATO - INCONEL HUB DIRECT THREAD BLK
New
UPC 798681731688 Free Shipping
$899.99 Axolotl Arms ★★★★★ (126)
Sig Sauer Hexium 5.56mm Inconel Direct Thread Suppressor
New
UPC 798681731688 Free Shipping
$899.99 Shooting Surplus ★★★★★ (193)
Sig Sauer Hexium 5.56mm Suppressor Titanium Hub Taper Direct Mount Cerakote Finish
New
UPC 798681731671 Free Shipping
$899.99 Shooting Surplus ★★★★★ (193)
Sig Sauer Hexium 5.56mm TI Suppressor 5.56mm Titanium Hub Taper Direct Mount 1/2"-28
New
UPC 798681731671 Free Shipping
$899.99 Cummings Family Firearms ★★★★★ (52)
SIG SAUER HEXIUM 556 SILENCER
New
UPC 798681731671 Free Shipping
$899.99 Kinetic Armory ★★★★★ (3)
SIG SAUER HEXIUM 556 SILENCER
New
UPC 798681731671 Free Shipping
$899.99 Axolotl Arms ★★★★★ (126)
Sig Sauer HEXIUM 5.56 Inconel Suppressor, 5.9" Direct Thread HUB
New
UPC 798681731688 Shipping $10
$899.99 Alexander's Store ★★★★★ (1,532)
Sig Sauer Hexium 5.56 Titanium Suppressor 6.2" HUB Direct Thread 1/2x28
New
UPC 798681731671 Shipping $10
$899.99 Alexander's Store ★★★★★ (1,532)
SIG Sauer HEXIUM 5.56 NATO Inconel HUB Taper Direct-Thread Suppressor, Black, 5.9-Inch
New
UPC 798681731688 Shipping $13
$899.99 Deerford Defense
Sig Sauer Hexium 5.56mm TI Suppressor 5.56mm Titanium Hub Taper Direct Mount 1/2"-28
New
UPC 798681731671 Shipping $18
$899.99 Blackbox Ballistics ★★★★★ (2)
SIG HEXIUM 5.56MM INC DIRECT THREAD
New
UPC 798681731688 Shipping $20 Free Shipping > $1,000
$899.99 Life2A ★★★★★ (3)
SIG SAUER HEXIUM 556 SILENCER
New
UPC 798681731671 Shipping $20 Free Shipping > $1,000
$899.99 Life2A ★★★★★ (3)
SIG Sauer HEXIUM 5.56 NATO Titanium HUB Direct-Thread Suppressor, Black, 6.2-Inch
New
UPC 798681731671 Shipping $35
$899.99 Deerford Defense
SIG SAUER M400 TREAD Pistol - chambered in 5.56 NATO with an 11.5-inch barrel. Features an M-LOK handguard, Picatinny top rail, and an SB Tactical SBA3 pistol brace. Ambidextrous safety selector and A2-style flash hider are standard. Firearm exhibits minimal signs of use...
Used
Shipping $36
$899.99 Guns.com ★★★★★ (38,455)
SIG SAUER RM400 TREAD PREDATOR - Designed specifically for predator hunting and inclusive of feature changes to suit the needs of hunters. The M400 TREAD PREDATOR is an aluminum frame rifle, with a Cerakote Elite Jungle finish to minimize visibility in woods or brush envir...
Used
UPC 798681672677 Shipping $36
$899.99 Guns.com ★★★★★ (38,455)
SIG SAUER SIGM400 - SIG M400 SBP short barrel pistol chambered in 5.56. Reliable, accurate, and built with SIG's quality standards. Features include a comfortable pistol grip, smooth action, and durable finish. Perfect for range days or as the foundation for your next bui...
Used
Shipping $36
$899.99 Guns.com ★★★★★ (38,455)
SIG SAUER SIGM400 - The Sig Sauer M400 is a top-tier semi-automatic rifle that has taken the firearms industry by storm. This 5.56 NATO rifle, manufactured by the renowned Sig Sauer brand, offers a perfect blend of precision, reliability, and customization options. With it...
Used
Shipping $36
$899.99 Guns.com ★★★★★ (38,455)
HEXIUM556INC
New
UPC 798681731688
$899.99 Pathfinder Militaria ★★★★★ (106)
Hexium 5.56mm INC HUB Direct Thread
New
UPC 798681731688
$899.99 CLB Guns ★★★★★ (45)
SIG HEXIUM 5.56MM INC DIRECT THREAD
New
UPC 798681731688
$899.99 Big Bee Bee ★★★★★ (11)
Sig Sauer Hexium 5.56 556 NATO Silencer / Suppressor Direct Thread 1/2x28 HUB Compatible HEXIUM556INC
New
UPC 798681731688
$899.99 GunPrime ★★★★★ (2,495)
Sig Sauer Hexium 5.56 556 NATO Silencer / Suppressor Titanium Direct Thread 1/2x28 HEXIUM556
New
UPC 798681731671
$899.99 GunPrime ★★★★★ (2,495)
Sig Sauer Hexium556 5.56 NATO Suppressor
New
UPC 798681731688
$899.99 Good 4 Guns ★★★★★ (276)
SIG SAUER HEXIUM556 5.56NATO SUPPRESSOR HUB TAPER D.T. MOUNT, BLACK, 3D PRINT TITAIUM CORE 1/2X28
New
UPC 798681731671
$899.99 Allied Arms ★★★★★ (310)
Sig Sauer Hexium 5.56mm TI Suppressor 5.56mm Titanium Hub Taper Direct Mount 1/2"-28
New
UPC 798681731671
$899.99 Tungsten Creek Tactical
Sig Sauer Hexium 5.56mm TI Suppressor 5.56mm Titanium Hub Taper Direct Mount 1/2"-28
New
UPC 798681731671
$899.99 Pathfinder Militaria ★★★★★ (106)
Sig Sauer Hexium 556NATO Suppressor - Titanium Core
New
UPC 798681731671
$899.99 Good 4 Guns ★★★★★ (276)
SIG SAUER HEXIUM 556 SILENCER
New
UPC 798681731671
$899.99 CLB Guns ★★★★★ (45)
SIG SAUER HEXIUM 556 SILENCER INCONEL
New
UPC 798681731688
$899.99 Allied Arms ★★★★★ (310)
SIG SAUER HEXIUM 556 SILENCER INCONEL
New
UPC 798681731688
$899.99 Tungsten Creek Tactical
Sig Suppressor Hexium 5.56 Inc Hub Dt
New
UPC 798681731688
$899.99 Shiner Tactical ★★★★★ (6)
SIG SUPPRESSOR HEXIUM 5.56 INC HUB DT
New
UPC 798681731688
$899.99 2 If By Sea Tactical ★★★★★ (135)
Sig Suppressor Hexium 5.56 Ti Hub Dt
New
UPC 798681731671
$899.99 Shiner Tactical ★★★★★ (6)
SIG SUPPRESSOR HEXIUM 5.56 TI HUB DT
New
UPC 798681731671
$899.99 2 If By Sea Tactical ★★★★★ (135)
SIG SAUER SIGM400 - The SIG Sauer M400 Tread V2 is an updated version of SIG Sauer's popular entry-level AR-15 style direct-impingement rifle. It addresses several common complaints from the original model-most notably improving the handguard making it a highly competitive...
Used
Shipping $36.04
$900.99 Guns.com ★★★★★ (38,455)
SIG RM40016BTRDV210 M400 556 16 10R BLK
New
UPC 798681715282
$904.10 Gun Wise
SIGM400, 5.56 NATO, RIFLE, 16IN, FORGE, BLK, SEMI, ROMEO-MSR GEN II, FIXED, AL MLOK HG, (1) 10RD MAG, CA
New
UPC 798681744138 Email for Price Shipping $20
$905.84 DK Gun & Dog ★★★★★ (56)
SIGM400, 5.56 NATO, RIFLE, 16IN, FORGE, BLK, SEMI, ROMEO-MSR GEN II, TELE STOCK, AL MLOK HG, (1) 10RD MAG
New
UPC 798681744121 Email for Price Shipping $20
$905.84 DK Gun & Dog ★★★★★ (56)
SIGM400, 5.56 NATO, RIFLE, 16IN, FORGE, BLK, SEMI, ROMEO-MSR GEN II, TELE STOCK, AL MLOK HG, (1) 30RD MAG
New
UPC 798681744114 Email for Price Shipping $20
$905.84 DK Gun & Dog ★★★★★ (56)
SIG RM40016BTRDV210 M400 556 16 10R BLK
New
UPC 798681715282 Shipping $20
$905.84 DK Gun & Dog ★★★★★ (56)
SIG M400 TREAD 5.56 NATO 16" V2 Rifle with M-LOK
New
UPC 798681715282
$907.99 Good 4 Guns ★★★★★ (276)
Sig Sauer RM400-16B-TRD-V2 M400 Tread 2.0 5.56X45MM 16" Rifle V2
New
UPC 798681688005 Free Shipping
$910.00 Bereli ★★★★★ (1,013)
SIG M400 TREAD 5.56 NATO 16" - S/S M-LOK HG 10RD BLACK
New
UPC 798681715282 Free Shipping
$921.30 Caliber Exchange ★★★★★ (1)
SIG SAUER M400 TREAD V2 5.56MM 10+1 16"
New
UPC 798681715282 Free Shipping > $1,250
$923.87 Nadir Solutions ★★★★★ (18)
SIG M400 TREAD 5.56 NATO 16" - S/S M-LOK HG 10RD BLACK
New
UPC 798681715282
$928.91 Patriotic Firearms
SIG SAUER M400 TREAD V2 5.56MM 10+1 16"
New
UPC 798681715282
$929.00 Get Guns N Ammo
SIG RIFLE SUPPRESSOR 5.56 NATO - INCONEL HUB DIRECT THREAD BLK
New
UPC 798681731688 Free Shipping
$929.56 Lightning Strike Arms ★★★★★ (32)
SIG SAUER HEXIUM 556 SILENCER
New
UPC 798681731671 Free Shipping
$929.56 Lightning Strike Arms ★★★★★ (32)
SIG SAUER M400 TREAD V2 - The M400 TREAD features a free-floating M-LOK enhanced handguard that is lightweight yet rigid for extreme control and ease of mounting accessories such as lights and handstops. The lower receiver has an ambidextrous safety for right or left-hande...
New
UPC 798681688005 Shipping $20
$932.99 Guns.com ★★★★★ (38,455)
SIG RM40016BTRDV210 M400 556 16 10R BLK
New
UPC 798681715282
$935.00 CLB Guns ★★★★★ (45)
SIG SAUER M400 TREAD V2 5.56 NATO 16"
New
UPC 798681715282
$936.33 Georgia Guns & Ammo ★★★★★ (2)
Sig Sauer RM40016BTRDV210 M400 556 10rd Black
New
UPC 798681715282 Shipping $18
$938.74 Classic Firearms ★★★★★ (2,454)
SIG M400 TREAD 5.56 NATO 11.5" - M-LOK MAGPUL BSL BRACE BLACK
New
UPC 798681698950 Free Shipping CC Fee 3% $10 Off Code CALIBERKING
$939.81 Armed in Michigan ★★★★★ (714)
SIG M400 TREAD 5.56 NATO 16 V2 BLK TELE MLOK 10R
New
UPC 798681715282 Free Shipping CC Fee 3% $10 Off Code CALIBERKING
$939.81 Armed in Michigan ★★★★★ (714)
SIG M400 TREAD 5.56 NATO 16" - S/S M-LOK HG 10RD BLACK
New
UPC 798681715282 Free Shipping
$945.03 Riddle Firearms
SIG M400 TREAD 5.56 NATO 16" - S/S M-LOK HG 10RD BLACK
New
UPC 798681715282
$945.03 MCM Tactical ★★★★★ (60)
SIG RM40016BTRDV210 M400 556 16 10R BLK
New
UPC 798681715282
$945.04 De Leon RX & Sporting Goods ★★★★★ (216)
SIG M400 TREAD 5.56 NATO 16" - S/S M-LOK HG 10RD BLACK
New
UPC 798681715282 Free Shipping
$948.26 Safe Haven Defense
SIG SAUER M400 RIFLE - RIFLE: SIG SAUER MODEL M400 RIFLE, SERIAL NUMBER 20L172831, BLACK (MATTE), CASE NOT INCLUDED, SEMI - AUTOMATIC, 5.56 NATO, 16 INCH 1:8 TWIST BARREL. W/ 1 MAGPUL MAG
Used
Shipping $38
$949.99 Guns.com ★★★★★ (38,455)
SIG M400 TREAD 5.56 NATO 16" - S/S M-LOK HG 10RD BLACK
New
UPC 798681715282
$950.99 Pathfinder Militaria ★★★★★ (106)
SIG M400 5.56mm Rifle, 16" Barrel, 10-Round, Black 798681715282
New
UPC 798681715282 $5 Off - Use Code CALIBERKING
$954.81 Gun Place ★★★★★ (206)
SIG SAUER M400 TREAD V2 5.56 NATO 16" 10rd
New
UPC 798681715282 Free Shipping
$958.10 Axolotl Arms ★★★★★ (126)
SIG M400 TREAD 5.56 NATO 16" - S/S M-LOK HG 10RD BLACK
New
UPC 798681715282 Shipping $20
$958.10 Custom Creatives Group ★★★★★ (24)
SIG RM40016BTRDV210 M400 556 16 10R BLK
New
UPC 798681715282
$958.10 Pickett's Mill Armory ★★★★★ (26)
SIG M400 TREAD V2 5.56 NATO - 16" M-PUL TELE STOCK MOSS
New
UPC 798681688012 Free Shipping
$958.99 Cummings Family Firearms ★★★★★ (52)
SIG M400 TREAD 5.56 NATO 16" - S/S M-LOK HG 10RD BLACK
New
UPC 798681715282 Free Shipping
$966.81 Timber Hole Outdoors ★★★★★ (5)
SIG M400 TREAD 5.56 NATO 16" - S/S M-LOK HG 10RD BLACK
New
UPC 798681715282
$966.81 Ferrari Firearms
Sig Sauer M400 Black Rifle 5.56 NATO 30rd Magazine 16" Barrel ROMEO-MSR GEN II Adjustable Stock M-LOK Handguard
New
UPC 798681744114
$966.81 Ferrari Firearms
SIG SAUER M400 FORGE 5.56MM BLK 16" 10+1
New
UPC 798681744121
$966.81 Ferrari Firearms
SIG SAUER M400 TREAD V2 - The M400 TREAD Pistol features a free-floating M-LOK enhanced handguard that is lightweight yet rigid for extreme control and ease of mounting accessories such as lights and handstops. The lower receiver has an ambidextrous safety for right or lef...
New
UPC 798681698950 Shipping $20
$966.99 Guns.com ★★★★★ (38,455)
SIG Sauer M400 Rifle, 5.56 NATO, 16-Inch Barrel, 30-Round
New
UPC 798681688012 Shipping $19.18
$969.48 Deerford Defense
SIG M400 TREAD 5.56 NATO 16"
New
UPC 798681715282 Free Shipping
$971.17 Shooting Surplus ★★★★★ (193)
SIG SAUER M400 TREAD V2 5.56 NATO 16" AR-15 Rifle, Black, 10+1
New
UPC 798681715282 Shipping $10
$971.99 Alexander's Store ★★★★★ (1,532)
SIG SAUER M400 TREAD V2 5.56MM 10+1 16"
New
UPC 798681715282 Shipping $18
$975.52 Sharp's Shooting Supply ★★★★★ (34)
SIG M400 TREAD 5.56 NATO 16" - S/S M-LOK HG 10RD BLACK
New
UPC 798681715282
$980.00 Birmingham Hill Armory ★★★★★ (16)
SIG SAUER M400 TREAD V2 5.56MM GRN 16"
New
UPC 798681688012 CC Fee 3%
$983.99 Cornerstone Arms ★★★★★ (373)
SIG RM40016BTRDV210 M400 556 16 10R BLK
New
UPC 798681715282 Shipping $20 Free Shipping > $1,000
$987.37 Dave's Guns ★★★★★ (28)
Sig Sauer M400 Tread Rifle 5.56 NATO 30rd Magazine 16" 1/2x28 Threaded Barrel Stainless Steel and Moss Green
New
UPC 798681688012 CC Fee 6%
$987.77 All Things Firearm ★★★★★ (3)

5.56x45mm Sig Sauer Guns Price Graph

Today's 5.56x45mm Sig Sauer Guns average is $911.17, 3% below the 180-day average of $936.60. Over the last 180 days, the average peaked at $968.18 on June 16, 2026 and bottomed at $910.01 on April 7, 2026.

Daily Deals Email

Products at their 90-day low price.

Unsubscribe anytime with one click.

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