Well, as some of you know, I've been beating on a Sig 556 rifle to see how it would hold up. Here's the update.
To date, I've fired 1,500 rounds with no cleaning and no additional oil. I've used every type of ammunition to include factory, foreign surplus, reloads, and Wolf ammo (both 55gr and 75gr.) I've used various magazines during the testing to include standard Mil-spec 20's & 30's (with both green and magpul followers), HK mags, MagPul mags (both 20's & 30's), polymer Israeli Orlite mags, polymer Thermold mags, Beta-mags, and the new steel Fusil mags.
In 1,500 rounds I experienced 0 malfunctions and I never needed adjust the gas system. The Sig simply performed superbly.
I give the Sig 556 the official USSA-1 seal of approval! Although it's not the most ergonomic rifle on the market, if it appeals to you, buy it. It will serve you well.
USSA-1