Any real advantage of an A4 vs an M4?
Nostalgia aside of course. Is there any distinct upper hand a full-sized A4 might have over an M4? Velocity comes to mind, which would primarily allow a greater range for optimal terminal ballistics (of course that assumes 20" vs 14.5"; 20" vs 16" and the gap narrows significantly). The rifle length gas system is the one the Stoner system was designed around, so there's that. Accuracy, all other weapon and ammo qualities being equal, *should* be about the same. Of course the M4 wins for weight and handiness.
Opinions?
The genesis of this isn't about need. I'm AR'd out as far as that goes. I have the 20" itch scratched already too (not A4 though). Just saw a decent deal on an A4 upper assembly that, with the addition of an A2 stock/buffer/spring I could easily convert a franken-M4 I have to the full-sized configuration. Yeah, I need it like another hole in my head but you guys know the deal with this affliction. ;)