AR Flat top 16" "F" marked FSB

[jmoore]

See if this helps: (in no particular order and NOT fact checked!)

BUIS: back up iron sight - in this case just the rear one
COMP: Not too sure it's anything but a model name from Aimpoint, but I never really looked into it
M3: Model of Aimpoint sight- there's also a COMP ML3, and a host of other newer ones
QD: quick detach
MOA: I reckon that one's known well enough, otherwise it's remedial school time
FSB: front sight base
F: F (Meaning the sight base was machined specifically for a flattop model rather than a carry handle model)
A.R.M.S.: ARMS: Atlantic Research and Marketing Something-or-another (the company that makes the QD mount for the COMP M3 that sits fwd of the BUIS on the FT upper...)

ETA: Edited to... Never mind! Anyway, ARMS stands for Atlantic Research Marketing Systems. Odd name, but generally good gear.

Information

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[LeagleEagle]

Best mount for an Aimpoint there is

http://stores.homestead.com/Laruetac...tail.bok?no=26