Just over 4 lbs with magazine (empty)!  Unbelievably easy to handle. 
 
Foxtrot Mike skeleton lower,
 
KM Tactical lightweight Upper reciever, 13" lightweight handguard, skeletonized trigger group and lightweight buffer tube
 
BCA 16" lightweight pencil barrel, lightweight BCG
 
Skeletonized polymer pistol grip, lightweight stock and micro compensator.