Consumer Gun Review: Sig Sauer M400 AR15


About a month ago i purchased an Sig Sauer M400 AR15.  Over that past month I have shot this gun a lot.  Every time that I go to the range that gun is with me. I have put almost 1500 rounds through it by now and have not had one malfunction.  It is a dream to shoot.

It has everything you could want in a rifle including a decent price.  It is dependable and easy to take apart and clean.  I would recommend this gun to any one that is looking to buy their first black gun. This gun is built to last and take a beating in the process. I know you may think that Sig just make handguns but they also make great rifles too.

I could not be happier with mine and did not have to spend a lot of money to get it. You can put what ever you want on this gun.  It looks good works great and I love it.  So if you see one try it out I know you wont be sorry if you do.

From Sig Sauer:

THE SIG M400 SERIES TACTICAL RIFLE, designed for use in law enforcement, military operations, or the sporting field as well as competitive shooting. The SIG M400 is a true AR platform tactical rifle. Provides unparalleled accuracy, with a 16″ chrome-lined and phosphate coated barrel that provides maximum durability and corrosion resistance. A 7075-T6 aircraft grade aluminum forged lower receiver adds to the durability and reliability.

– Direct impingement gas operating system with rotating locking bolt
– 5.56 x 45 mm NATO Chrome-lined barrels with phosphate finish
– Accepts most M16 type magazines
– M16A2 Type flash supressor
– “F” marked fixed front sight
– Detachable carry handle M16A3 type rear sight

By: ben dismer

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2 Responses to Consumer Gun Review: Sig Sauer M400 AR15

  1. andrew says:

    I have been really interested in this weapon for a while now, I know sig is quality otherwise SEALs wouldn’t trust their lives to,them (p226), but I have yet to see anyone give an accuracy report for the m400. I for one would love too see how well the,1:7 twist prints down range.

    • David Wilder says:

      I’m new to the AR market and was having a difficult time deciding on which one to purchase, until I saw the Sig. I have to admit I purchased the M400 based on my experience with their hand guns and for the most part I am very happy with my decision. I was however rather disappointed with the accuracy of the weapon and spent a lot of hours trying to improve the 2” grouping I was getting at 100 yards using 223 55gr federal ammunition.

      I’m an avid reloader so I armed myself with several rounds of different powders at various weights but staying with the 55gr bullets, with little success. Then I tried the federal 5.56 62gr NATO round with vast improvement. Apparently the 1:7 twist likes the heaver bullet at the higher pressure of the 5.56 cartridge. Those 2” groups turned into .25” and smaller, much more to my liking.

      As far as the weapon itself, it is a Sig through and through. Items such as the ambidextrous mag release and the tensioning screw which keeps the upper and lower half tight are things you won’t find on other weapons. I did however change the trigger group to a Geissele SSA Enhanced trigger set which if you’re using it for hunting is a must reducing the trigger pull from 8lbs to 4.5lbs.

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