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I just recently bought a brand-new Armalite AR-15 from a local gun show. Full length 20" barrel, fixed-stock , but came with a quad-rail, bi-pod and what looks like an aftermarket A-frame front sight assembly (I may be mistaken). I did an initial cleaning after buying it and it looks absolutely new inside, oiled it up and got ready for the range.
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I really don't think you have a NIB rifle. Parts have been changed out. If someone changed the front sight and did not get the gas port aligned perfect you well have a under gassed rifle. A under gassed rifle well not feed the next round when fired, just as you are experiencing. Very unlikely you have a RE spring or buffer issue. The A1-A2 RE/spring/buffer is pretty fool proof on a 20" gas system.
I would shoot some quality 5.56 ammo and see if the bolt is held back on the last round.
Is this new front sight pinned or clamped?