A BCM with a pencil barrel is pretty light and highly recommended.
Here are a couple of my AR builds (pencil profile) with accurate weights...
AR #1
BCM 16" LW midlength upper with BCM M16 BCG, Gunfighter Mod 4 charging handle, MBUS Gen 2 rear sight and MOE handguards/pistol grip with IWC QD mount ---- 4lbs, 2.6oz
Valkyrie lower with DD LPK, BCM receiver extension kit, H buffer and CTR stock ---- 2lbs 3.7oz
4lbs, 2.6oz + 2lbs 3.7oz = 6lbs 6.3oz basic rifle
AR #2
Daniel Defense 16" LW midlength upper with DD M16 BCG, Gunfighter Mod 4 charging handle, MBUS Gen 2 rear sight and MOE handguards/pistol grip with IWC QD mount ---- 4lbs, 0.6oz
S&W M&P15 lower with DD LPK, BCM receiver extension kit, H buffer and CTR stock ---- 2lbs 3.7oz
4lbs, 0.6oz + 2lbs 3.7oz = 6lbs 4.3oz basic rifle
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