Steve over at The Firearms Blog is reporting that at least in Europe, Sig has entered the AR-15 market:
I had no idea that Sig Sauer were making AR-15 / M16 rifles but my DSEi spy spotted this prototype SIG516 1 PDW at the DSEi 09 expo. It features a 7" barrel, putting it firmly in the PDW class, and chambers the 5.56mm NATO.UPDATE:
The SIG516 Tactical Rifle line has three different models:
SIG516 PDW : 7" barrel. A personal defense weapon (pictured above).
SIG516 CQB : 10" barrel. A Colt M4 Commando equvelent.
SIG516 BASELINE CARBINE : 14.5" barrel. A M4 Carbine equvelent.
SIG516 Patrol. 16" barrel.
SIG516 Tactical Marksman: 16" barrel A squad level sniper / designated marksmen rifle.
SIG516 Precision Marksman: 20" barrel. Possibly a true sniper rifle, or designated marksmen rifle.
They are all piston operated and feature an adjustable gas regulator like the Ruger SR-556.
Ummmmm, okay. Should they roll this platform into the U.S., it will compete most directly with their own Sig 556, yet another piston-operated 5.56 and a really nice (if heavy) carbine in its own right.