Captain Obvious: What exactly is a forward assist?
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[img]http://www.usgunparts.com/a2upprec.jpg[/img]
It's a solution in search of an anticipated problem.
# 22, along with the lump on the rear starboard side of the receiver. Unlike pistols where you just push the slide forward, or auto rifles with a bolt handle (Mini-14, M-1 Garand, AKs, etc.) AR/M16 "slab sides" didn't have any way to force the bolt forward in case it doesn't go into full battery.
Kinda like a spare tire (& you need it about as often).
If you ever DO need it, it's time to inspect (probably clean) your damned rifle. It's just there for combat emergencies, & to make someone in the 60s more "comfortable" with the rifle in V.N. conditions.
Like the port cover, it really doesn't need to be there at all.