Because I had nothing better to do (all weights with empty mag and listed accessories):

Target AR: 12 lbs (A3 with scope and mount, 20" SS bull barrel)
Bushmaster M4A3: 7 lbs (with Holosight and DPMS detachable sight)
Lightweight A3 AR: Under 5.75 lbs (different scale, with OKO Reflex sight)

Israeli LB FAL: 11 lbs
Israeli HB FAL: 13 lbs
StG-58 FAL : 12 lbs (Tapco scope mount, scope, DSA QD bipod)

CETME: 12 lbs (with scope and mount)
VEPR II: 9 lbs (7.62 x 39)
M1 Garand: 10 lbs (Fulton Armory 308 Garand; match barrel, Fajen Laminate stock)

Just weighed my mutt 20" ar-15 (DPMS lower and Oly arms upper) and it came out at a featherweight 10lbs!

Keving67