Sig Sauer M400 Tread 5.56 NATO 30+1 16" Stainless Steel Barrel, Concrete Cerakote Aluminum Receiver w/Picatinny Rail, M-LOK Handguard, Magpul SL-K Black Synthetic Stock, Reduced Angle Grip
The M400 TREAD features a free-floating M-LOK enhanced handguard that is lightweight yet rigid for extreme control and ease of mounting accessories such as lights and handstops. The lower receiver has an ambidextrous safety for right or left-handed operation and includes an integrated QD mount for easy sling attachment. The M400 TREAD features a stainless steel barrel offering durability and corrosion resistance while improving accuracy; 3-prong flash hider; 1:8 twist rate; mid-length gas system; SIG Matchlite 2-stage trigger; MAGPUL SL-K telescoping stock for easy adjustment and a customized fit.
Brand Sig Sauer
Category Tactical Rifles
Series Tread V2
Model M400
Caliber 5.56 NATO
Barrel Length Range 16" to 16.99"
Gun Platform AR Style
Operating System Direct Impingement
Stock Finish Group Black
Capacity 30+1
Stock Material Synthetic
Action Semi-Auto
Oal 32.50"
Hand Ambidextrous
Sights None
Barrel Finish Stainless
Barrel Material Stainless Steel
Muzzle 3 Prong Flash Hider
Twist 1:8"
Receiver Description Picatinny Rail
Grips Reduced Angle
Handguards M-LOK
Height 7.10"
Receiver Material Aluminum
Width 2.60"
Stock Description Magpul SL-K
Barrel Description Stainless Steel
Barrel Length 16"
Max Capacity 30
Receiver Finish Concrete Cerakote
Trigger Two-Stage Matchlite Duo
Weight 6.50 lbs
Stock Finish Black
Caliber Dictionary
The Below Information Has Been Provided From Our Gun Caliber Dictionary And Is Meant For Informational Purposes Only. It Is Not Intended to Describe The Unique Specifications For This Ammunition.
The 5.56X45mm NATO cartridge was designed by James Sullivan, a member of Eugene Stoner's engineering team that developed both the M16 rifle and its original cartridge. The 5.56X45mm NATO was adopted by the U.S. military in 1964 and by NATO in 1980. With bullet diameter of .224-inch, the original M193 military cartridge used a 55-grain bullet at 3250 fps; the current M855A1 cartridge, developed by FN, uses a 62.5-grain bullet at 3020 fps, offering greater range and better penetration. The civilian version of the 5.56X45mm is 223 Remington; the cartridges are dimensionally identical but military chamber dimensions and specifications for military brass are different. It is considered safe to use 223 Remington ammo in a 5.56X45MM NATO chamber, but not a good idea to use 5.56X45mm ammo in a rifle specifically chambered for the 223 Remington. Although the stopping power of .22-caliber bullets remains controversial the 5.56X45mm has served well in now multiple generations of M16 rifles. — Craig Boddington
