Sig Sauer M400
We list 36 Sig Sauer M400 rifles, 12 in stock now from $999.99. Our in-stock M400 rifles are chambered in 5.56 NATO, with 11.5 and 16 inch barrels and 10 and 30 round magazines.12 Sig M400 in stock from $999.99. Every listing, side by side.
Prices from $999.99 to $1,749.99, as of Nov 13, 2026.
Pick your M400
Every M400 line we list, with the count in stock and the lowest price for each.
All M400 rifles
12 in stock. Sold out listings stay up, after the ones you can buy today.
Compare M400 models
The most listed size for each model in stock. 10 round versions of most models are listed for states with magazine limits.
As of Nov 13, 2026
Compare M400 models
The most listed size for each model in stock. 10 round versions of most models are listed for states with magazine limits.
| Model | Size / grip | Barrel | Standard mag | Calibers | In stock | From | Shop |
|---|---|---|---|---|---|---|---|
| M400 Tread | 16 in | 30 | 5.56 NATO | 1 | $1,399.99 | Shop | |
| M400 | 16 in | 30 | 5.56 NATO | 11 | $999.99 | Shop |
Source: barrel, magazine and caliber are taken from our in-stock listings for each model.
Built for your M400
Scope mounts and parts that fit the M400, from Sig and other makers. Parts ship to your door where your state allows.
M400 models we stock
Our in-stock Sig M400 listings break down into the M400 (11) and the M400 Tread (1). Pick a model above to see only those listings, or compare them in the table.
Calibers and sizes
In stock by caliber: 5.56 NATO (12). Barrel lengths run from 11.5 to 16 inches. Magazines hold 10 and 30 rounds; the 10 round versions are for states with magazine limits. Prices run from $999.99 to $1,749.99.
Magazines and parts for the M400
We have 8 in-stock accessories made for the M400, from Sig Sauer and other makers: 2 sights, 1 trigger and 2 handguards. They ship to your door where your state allows.
Buying a gun online
Magazines and most parts ship to your door where your state allows. Check state restrictions before you order, and read how buying a gun online works. Firearms can go on layaway, and financing shows at checkout when the order qualifies.
More Sig Sauer series
Sig M400 FAQ
Do you have the Sig M400 in stock?
Yes. As of Nov 13, 2026 we have 12 M400 rifles in stock, from $999.99. Stock changes daily, and listings that sell out stay on this page.
What calibers does the Sig M400 come in?
Our in-stock M400 listings are chambered in 5.56 NATO.
Do you ship Sig M400 guns to my house?
No. A firearm bought online ships to a licensed dealer (FFL) you pick at checkout, and you fill out the transfer paperwork there. Magazines and most parts ship to your door where your state allows.