Skip to main content
We may get paid by partner for deals, including promoted items

Menu

Trending
Top Brands Palmetto State ArmoryHot Yeti CoolerDeal NatchezDeal SitkaDeal 5.11Sale Winter Clearance Amazon Pickleball Sale Amazon FitnessHot Stores
Sig Sauer M400 X-Series 5.56 AR-15 Semi-Automatic Rifle by Sig Sauer -

Product Description

Sig Sauer M400 SDI X-Series: The Ultimate Modern Sporting Rifle for Discerning Shooters The Sig Sauer M400 X-Series, identified by the MPN RM400SDI16BP and UPC 798681664634, redefines the modern sporting rifle. Engineered for precision, reliability, and modularity, this 5.56x45mm NATO AR-style firea

Sig Sauer M400 X-Series 5.56 AR-15 Semi-Automatic Rifle

at DEGuns
Browse all DEGuns deals
$1542.99
In Stock at DEGuns
Price verified 1d ago
Buy Now at DEGuns
Secure checkout Easy returns
or compare prices
Amazon logo Amazon eBay logo eBay

Product Details

Brand Sig Sauer
Sig Sauer

More from Sig Sauer

T.REX ARMS
Last Updated:
Sep 06, 2026 10:09 AM
OEM SIG SAUER Magazine - P365 XMacro (17rd), 9mm OEM SIG SAUER Magazine - P365 XMacro (17rd), 9mm View Details
$60.00
Buy Now · $60.00
T.REX ARMS
T.REX ARMS
Last Updated:
Sep 06, 2026 10:09 AM
OEM SIG SAUER Magazine - P250/P320 Compact (15rd), 9mm OEM SIG SAUER Magazine - P250/P320 Compact (15rd), 9mm View Details
$50.00
Buy Now · $50.00
T.REX ARMS
T.REX ARMS
Last Updated:
Sep 06, 2026 10:09 AM
SIG SAUER TANGO6T 1-6X24mm DVO - DWLR-556, FDE SIG SAUER TANGO6T 1-6X24mm DVO - DWLR-556, FDE View Details
$2199.00
Buy Now · $2199.00
T.REX ARMS
T.REX ARMS
Last Updated:
Sep 06, 2026 10:09 AM
SIG SAUER TANGO6T 1-6X24mm - DWLR6, FDE SIG SAUER TANGO6T 1-6X24mm - DWLR6, FDE View Details
$1699.00
Buy Now · $1699.00
T.REX ARMS
T.REX ARMS
Last Updated:
Sep 06, 2026 10:09 AM
SIG SAUER ROMEO8T Red Dot Sight - FDE SIG SAUER ROMEO8T Red Dot Sight - FDE View Details
$729.99
Buy Now · $729.99
T.REX ARMS
T.REX ARMS
Last Updated:
Sep 06, 2026 10:09 AM
SIG SAUER ROMEO8T Red Dot Sight - Black SIG SAUER ROMEO8T Red Dot Sight - Black View Details
$699.99
Buy Now · $699.99
T.REX ARMS
T.REX ARMS
Last Updated:
Sep 06, 2026 10:09 AM
SIG SAUER ROMEO4XT-PRO Red Dot Sight - FDE SIG SAUER ROMEO4XT-PRO Red Dot Sight - FDE View Details
$599.99
Buy Now · $599.99
T.REX ARMS
T.REX ARMS
Last Updated:
Sep 06, 2026 10:09 AM
SIG SAUER KILO4K Rangefinder - Graphite SIG SAUER KILO4K Rangefinder - Graphite View Details
$599.99
Buy Now · $599.99
T.REX ARMS
T.REX ARMS
Last Updated:
Sep 06, 2026 10:09 AM
SIG SAUER ROMEO4XT-PRO Red Dot Sight - Black SIG SAUER ROMEO4XT-PRO Red Dot Sight - Black View Details
$579.99
Buy Now · $579.99
T.REX ARMS
T.REX ARMS
Last Updated:
Sep 06, 2026 10:09 AM
SIG SAUER ROMEO4T Red Dot Sight - PRO, FDE SIG SAUER ROMEO4T Red Dot Sight - PRO, FDE View Details
$569.99
Buy Now · $569.99
T.REX ARMS
T.REX ARMS
Last Updated:
Sep 06, 2026 10:09 AM
SIG SAUER ROMEO4T Red Dot Sight - Solar, FDE SIG SAUER ROMEO4T Red Dot Sight - Solar, FDE View Details
$550.00
Buy Now · $550.00
T.REX ARMS
T.REX ARMS
Last Updated:
Sep 06, 2026 10:09 AM
SIG SAUER ROMEO4T Red Dot Sight - PRO, Black SIG SAUER ROMEO4T Red Dot Sight - PRO, Black View Details
$549.99
Buy Now · $549.99
T.REX ARMS
T.REX ARMS
Last Updated:
Sep 06, 2026 10:09 AM
SIG SAUER ROMEO4T Red Dot Sight - Solar, Black SIG SAUER ROMEO4T Red Dot Sight - Solar, Black View Details
$530.00
Buy Now · $530.00
T.REX ARMS
T.REX ARMS
Last Updated:
Sep 06, 2026 10:09 AM
SIG SAUER ROMEO-X Enclosed Red Dot Sight - Compact, 3 MOA, Black SIG SAUER ROMEO-X Enclosed Red Dot Sight - Compact, 3 MOA, Black View Details
$479.99
Buy Now · $479.99
T.REX ARMS
KFF Defense
Last Updated:
Sep 06, 2026 09:51 AM
Sig Sauer P365X Optic Ready MA Compliant 9MM 10-Round 3.1" Pistol Sig Sauer P365X Optic Ready MA Compliant 9MM 10-Round 3.1" Pistol View Details
$677.73 $771.40
12% off
Buy Now · $677.73
KFF Defense
KFF Defense
Last Updated:
Sep 06, 2026 09:51 AM
Sig Sauer M400 SDI X OD Green 5.56x45mm NATO 16-inch AR-15 Rifle Sig Sauer M400 SDI X OD Green 5.56x45mm NATO 16-inch AR-15 Rifle View Details
$1715.85 $1953.00
12% off
Buy Now · $1715.85
KFF Defense
KFF Defense
Last Updated:
Sep 06, 2026 09:51 AM
Sig Sauer P211 9MM 21/23 Round Capacity 4.4 Inch Pistol Sig Sauer P211 9MM 21/23 Round Capacity 4.4 Inch Pistol View Details
$3002.43 $3417.40
12% off
Buy Now · $3002.43
KFF Defense
Sportsman Fulfillment
Last Updated:
Sep 06, 2026 09:47 AM
Sig Sauer MCX Spear LT Pistol 9" Barrel AR15 300 Blackout Coyote IR Sig Sauer MCX Spear LT Pistol 9" Barrel AR15 300 Blackout Coyote IR View Details
$2499.99
Buy Now · $2499.99
Sportsman Fulfillment
Primary Arms
Last Updated:
Sep 06, 2026 09:42 AM
SIG Sauer P320 X-Series Compact Grip Module - 9/40/357 - Large - Coyote SIG Sauer P320 X-Series Compact Grip Module - 9/40/357 - Large - Coyote View Details
$69.99
Buy Now · $69.99
Primary Arms
Primary Arms
Last Updated:
Sep 06, 2026 09:42 AM
SIG Sauer ALPHA One Piece Scope Mount - 30mm - 20 MOA SIG Sauer ALPHA One Piece Scope Mount - 30mm - 20 MOA View Details
$79.99
Buy Now · $79.99
Primary Arms