These are Original Colt Marked M16A1 Front Sight Base with Taper Pins, Surplus in good condition. They will be “C” marked (some marking will be worn/faint but will be there). These assemblies come with the front sling ring, front sight post, plunger and spring. Bayonet lug fits standard US bayonet patterns. Designed for the M16A1, these assemblies have a .627″ internal diameter, for “pencil” barrels. Fits .627 barrels only.
Used in *Good* condition and the front sling rivet may need to be re-pressed.
These will show some signs of wear; may or may not have remnants of paint and other residue from service. All will come with original sling swivel, front sight post and original taper pins. FSB you receive will be in similar or better condition to the one pictured. Will look and perform excellently on your build!