Ok, I did weigh again and realized I forgot the DD and BCM have Mossie Midnight Mount light mounts and QD sling mounts. Adjusting for that, their stripped weights are 1.4 oz less. The PSA upper came in exactly the same weight as before. I edited post #7 to reflect that. And here are the stripped URG weights again:
Each barreled upper is a 16" midlength with forward assist, dust cover, delta ring/full barrel/extension/nut/etc., F-marked FSB/bayonet lug/sling mount/end cap and A2 birdcage. No handguards, rear sight, BCG or charging handle.
Daniel Defense LW profile CHF (no sling mount under FSB) - 2# 9.5 oz.
BCM LW profile button rifled - 2# 11.5 oz.
PSA gov't profile button rifled - 2# 13.2 oz.
ArmaLite HBAR profile button rifled (with railed gas block/front sight, no bayonet lug) - 3# 5.1 oz.
Still, the difference between the BCM LW profile and PSA "gov't" profile is only 1.7 oz. Does anyone have accurate weights for pencil vs. gov't profile? Or have a PSA 16" pencil barrel midlength upper? I really thought there'd be at least 4-5 oz. difference. Ya learn something every day!
I should add that PSA describes this as their "Mid-Length Light Profile 16'' CMV Chrome-Lined Stripped Upper" not a government profile (though it sure looks like one in the pictures above). The barrel must be slightly lighter than the average gov't profile barrel. Anyway, somehow they kept the weight within 2 oz. of the BCM pencil barrel.
Here's what PSA says about the barrel:
Barrel: 16" Chrome-lined, chrome moly vanadium. Chambered in 5.56 NATO, with a 1/7 twist, M4 barrel extension, and a mid-length gas system. The special light profile barrel is high pressure tested and magnetic particle inspected and then phosphate coated. Barrel is finished off with an .750" diameter F-marked front sight base with sling swivel, standard handguards and an A2 flash hider. Barrel is made for us right here in SC by FN Manufacturing.
16" Barrel length
Chrome moly vanadium barrel
5.56 Nato Chamber
1 in 7" twist rate
M4 Feed ramps
F-Marked Front sight post
A2 Flash Hider
Standard Hand Guards w/ heat sheilds
Forged upper receiver