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This product can expose you to chemicals including lead, known to cause cancer and birth defects. For more info visit P65Warnings.ca.gov.
Sig Sauer
M400
$1,749.99
$1,599.99
Sale Price
Available
California Restriction Notice
This item is restricted for standard California customers and may not be transferable in California without a qualifying exemption.
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Sig Sauer M400, SDI, Semi-automatic Rifle, AR, 223 Remington/5.56 NATO, 16" Cold Hammer Forged Steel Barrel, Cerakote Finish, Flat Dark Earth, Magpul SL Stock, Sig 2-Stage Matchlite Duo Trigger, Low-Profile Gas Block with Mid-Length Gas System, 30 Rounds, 1 Magazine RM400-SDI-16B-FDE
Key Details
Brand
Sig Sauer
Manufacturer Part Number
RM400-SDI-16B-FDE
UPC
798681714469
SKU
SGRM400-SDI-16B-FDE
Current Stock
8 available
Quantity Updated
Sep 6, 2026 5:53 AM
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Purchase Requirements
- This product requires FFL processing before pickup or transfer.
- Age verification is required before checkout completion.
- California compliance or distributor restriction review may apply.
- Final availability is confirmed at checkout.
In-Store Pickup Required: All firearm purchases must be picked up at our Beverly Hills location after background check completion.
Product Description
The M400-SDI X has been developed with the input from the professional instructors at SIG SAUER Academy. Building upon their decades of experience and countless hours of instruction, Sig have developed the M400-SDI X to meet the highest standards of performance and reliability. With fully ambidextrous controls including a bolt catch/and release unique to the M400-SDI lower-receiver, the M400-SDI X delivers advanced performance for both left & right-handed shooters and makes transitional shooting easier than ever. The free-floating handguard utilizes a 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 an out-of-the-box crisp 4.5 - 6.5lb pull weight with a flat blade design for a precision feel. The M400-SDI X utilizes the highest quality performance coatings to ensure maximum durability and reliability.
Features
- Ambidextrous Bolt Catch and Release
- Low Profile Gas Block with Mid-Length System
- SIG 2-Stage Matchlite Duo Trigger
- Hybrid Compensator/Flash Hider
- Magpul SL Stock
- Flat Dark Earth Cerakote Finish
Specifications
UPC:
798681714469
Manufacturer:
Sig Sauer
Manufacturer Part #:
RM400-SDI-16B-FDE
Model:
M400
Model (Alt):
SDI
Action:
Semi-automatic
Barrel Length:
16"
Capacity:
30 Rounds
Finish:
Cerakote
Grips:
Polymer
Type:
AR
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