Good enough to see all components.... Like the side of the rear sight block, gas block, front sight block, barrel to receiver.... That sorta thing. We also have a list of component variations to fill in. Looks like...
Barrel Lug: Short/Long/Pinned/Uncertain
Battle Sight on RSL: П/3/D/III/Uncertain
Bayonet Type: Blade/Spike/Uncertain
Bayonet Lug: Early Cut/Late Non-Cut/Uncertain
Bolt Carrier: Early Cut/Late Non-Cut/Uncertain
Gas Tube: Early 1 Piece/Late 2 Piece/Uncertain
Gas Block: Early Milled/Late Cast/Late Cast w/Round/Uncertain
Receiver Cover Takedown: Normal/Inverted/Uncertain
Rear Sight Block: Early Milled/Mid Milled/Late Milled/Late Cast/Uncertain
Serial Number Format: X Digits, Y,YXX,###
S/N on Components: Last X digits/Uncertain
S/N on Stock: Last X digits, leading zeros, Small/Medium/Large Font/Uncertain
Stock Swivel: Bottom/Side/Uncertain
Trigger Group Type: Early Milled/Late Stamped/Uncertain
Notes: Things such as where the firearm was found. Owner of the photos, mismatching components, etc.