My AR weights vary just like most of the members here because of different optics, no optic, weaponlight, no light, barrel length and contour, stocks, and I'll callout the major components, all are with sling and fully loaded 30rd PMAG with M855/ SS109 ammo.
Colt 6721 with 16" medium contour midlength barrel
LaRue FF 9.0 rails & FUG VFG
Vltor EMOD stock
Aimpoint M2 with LaRue cantilever QD mount
Magnifier with LaRue pivot QD mount
Surefire M961C weaponlight
11 lb
Colt 6721 factory HBAR 16" carbine gas system
KAC M4 RAS rails
Vltor IMOD stock
EOTech 551 (small model) with LaRue QD mount
Surefire M951C weaponlight
10.5 lb
LMT M4 16" government profile barrel carbine gas
KAC M4 RAS rails
KAC VFG
Magpul CTR stock with enhanced 0.7" rubber buttpad
EOTech 551
Surefire M951C weaponlight
9.6 lb
Colt M16A2 clone rifle government profile 20" barrel
KISS, no optic and no light
8.8 lb
RRA A4 9mm carbine 16" government profile barrel
Daniel Defense EZ CAR 7 rails & CAA VFG with storage compartment
Magpul MOE stock
No name RDS
Surefire G2 light with Daniel Defense offset PAK QD light mount
32 round C Products SS mag (with IMI 9mm SMG ammo)
9.5 lb
(when my 9mm carbine was new KISS setup without rails, VFG, light and RDS = 8 lb loaded)
One of my next project would be a lightweight carbine with lightweight components.