The SIG Sauer, 551A1, Classic, in 5.56x45. It uses the swiss style translucent magazines which hold 30 rds. They are very available and while a bit higher priced than an AR15's mag...are much better made and do not corrode/create friction locks/failures to feed. The 551A1's mags and the 556 classics are NOT interchangeable. The 556 Classic accepts AR15 mags. Which there are millions of by now...
The 551A1 seems very well manufactured. Fit and finish are superb. The sights seem very much what you would expect from a nation of sharpshooters. The trigger will need to be re-adjusted...once I have some range time on it. It seems a bit stiff. The STANAG rail makes installing optics a snap. The mags rock in the same as an AK and the release is quite similar. An adjustable gas system is a real bonus! A bayonet lug can be purchased and installed in the "ring" on the bottom of the FSB. The rifle is supplied with 2 mags, a comprehensive owners booklet, a security lock, hard case, warranty card a coupon for discounted accessories and is NOT supplied with a sling. An H&K style double point sling will fit nicely. The bolt locks open after the last shot. Very similar to an M-16. The stock locks up very solidly and seems sturdy enough for combat shooting. The barrel twist is 1x7.
How do the sights compare to an AR15/M16 A2 sights 
