AjimboB said:
It's currently in the process of being replaced by the Scar-H I believe.
The US Army currently uses the M4, the M4A1, the M16A2 and the M16A3, all these rifles to be replaced the SCAR-L, while the SCAR-H was to complement it, and possibly replace the 7,62 NATO SR-25 variants and 7,62 M43 SR-47 rifles used in some capacities.
However, recent budget cuts have led to this program being cancelled. (Unlike the XM8, which was cancelled because it failed to meet the requirements of modern infantry. Just a G36 in a fancy box... which is, in turn, just an AR-18 in a fancy box. So it's just an AR18. Which already failed army trials!)
The USMC still uses the M16A4 (essentially the same thing as the M16A2, though retrofitted with an RIS top rail and handguard), they've replaced some M249s with HK416s, so it's possible they may be doing this as a method of getting their "foot in the door" to replace their A4's with 416s.
No idea on what the Navy or Airforce use. I know the Navy used to have a lot of M16A3s, though I don't know if these have since been converted into M4s.
AR-15 should never have been put into service with the Army or Marines IMO. Another great example of the Air Force ruining everything for everyone... (yes,
everyone, even us Brits and the Germans...
Daaaaaaaaaaaaaaaaaaaaaaaamn yooooooooooooooooou USAF!)