Sig Sauer M400 Tread V2 5.56 NATO
Model: RM400-16B-TRD-V2
Sig Sauer M400 Tread V2 5.56 NATO
Model: RM400-16B-TRD-V2
Full Specifications
Threaded 1/2x28 barrel: compare 5.56 / .223 suppressor prices.
About This Firearm
The Sig Sauer M400 Tread V2 is a mid-length semi-automatic AR-15 in 5.56 NATO built for range shooting and home defense. It has an MSRP of $1,099.99. Its lower receiver has a quick-detach sling socket machined into it, so a sling attaches without a plate behind the buffer tube or a clamp on the handguard.
It comes with one 30-round magazine and a Magpul SL-K stock that adjusts through six positions. The safety selector works from either side and the two-stage Matchlite Duo trigger is fitted from the factory, so neither is a part to buy later. No sights come with the rifle. The 16-inch stainless barrel is threaded 1/2x28 on a tapered shoulder, and the three-prong flash hider unscrews for a brake or a suppressor mount.
If you're cross-shopping, a Smith & Wesson M&P 15 Sport III has an MSRP of $799 and weighs 6.52 lbs against the Tread V2's 6.50 lbs on the same 1:8 twist, but with a single-stage trigger, a single-sided safety and a chrome moly barrel. A Daniel Defense DDM4 V7 has an MSRP of $2,073 and brings a cold hammer forged chrome-lined barrel and a hard case, at 0.30 lbs lighter. The Tread V2 sits between the two on price.
Best For
Strengths & Limitations
- The muzzle thread has a tapered shoulder, so a flash hider or a brake indexes on the shoulder and needs no crush washer.
- The gas system is mid-length behind a low-profile gas block, which leaves the top rail clear from the receiver to the muzzle end.
- The Magpul SL-K stock gives six positions, so length of pull adjusts for a heavy coat or a plate carrier.
- A stainless barrel is not chrome lined, so it wants cleaning more often than the chrome-lined bore on a Daniel Defense DDM4 V7.
- One magazine is in the box, so magazines are an immediate purchase.
- The SL-K is a minimalist stock with no comb adjustment, so a tall optic mount leaves the cheek unsupported.
Category Rankings
How the Sig Sauer M400 Tread V2 5.56 NATO ranks among full-size 5.56 NATO rifles.
Compatible Ammunition
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Frequently Asked Questions
Does the warranty transfer if I sell it?
Yes. Sig's Infinite Guarantee needs no receipt and no warranty card. It stays with the rifle instead of with whoever bought it.
What magazines does it take, and what colors was it sold in?
Any standard AR-15 magazine. Sig lists the rifle in Moss Green Cerakote and Concrete alongside black, and in a reduced-capacity version for states that cap magazines.
How are the sights meant to be mounted?
On the rail. Sig sells the rifle optics ready with no iron sights at all, so a red dot or a scope goes on the receiver rail and folding sights, if you want them, go either side of it.
