The same SIG principles that guided its other rifle products, such as SIG516 and MCX Virtus, are present in the M400 Tread. The SIG Tread is a no-nonsense AR rifle. A collapsible buttstock is easily adjustable for length of pull and/or transport. The M400 Tread is one of lighter AR versions on the market, especially considering that it features a full-length rail and stainless steel 1:8 twist 16-inch barrel. It weighs in at a svelte 7 pounds. SIG machines the low profile micro gas block found in Tread from stainless steel. It is much lighter than standard low profile gas blocks, helping to shave weight from the rifle and keeping it balanced properly. SIG used a mid-length gas system for a smoother recoil impulse. Ambidextrous controls are another nice touch with the base M400 Tread rifle.
Action Type: Semi Automatic
Barrel Length (in.): 16
Caliber/Gauge: 5.56 NATO
Capacity: 30+1 Round
Contains Lithium Battery/s: No
Sig Sauer RM400-16B-TRD-SB M400
Semi-Auto Rifle, 5.56 Nato, 16" Bbl
Tread, Snakebite, Coyote Receiver and Tele Stock, 30+1 Rnd
Each Shippable: Not Defined
Gun Type: Rifle
Hand: Right Hand
Inner Pack Shippable: Not Defined
Invalid States: CA,MA,CO,NY,NJ,MD,VT
Master Pack Shippable: Not Defined
Model: RM400-16B-TRD-SB
Prop 65 Cancer Causing Chemical: Lead
Prop 65 Item: Yes
Prop 65 Labeled: Yes
Prop 65 Reproductive Harming Chemical: Lead
Prop 65 Settlement: No
Prop 65 Short Form Label on Product: Cancer & Reproductive Harm
Specifications
| Action Type | Direct Impingement |
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| Barrel Length | 16'' |
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| Capacity | 30+1-Round |
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| Cartridge | AKK_5.56 mm NATO |
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| Finish | Cerakote |
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| Front Sight | None |
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| Length | 35.5'' |
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| Magazine Included | 1 x 30-Round |
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| Magazine Type | Removable |
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| Make | Sig Sauer |
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| Make/Model | Sig Sauer|M400 Tread |
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| Model | M400 Tread |
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| Muzzle | Flash Hider |
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| Rear Sight | None |
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| Stock Material | Polymer |
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| Weight | 7 lbs |
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