The A4 is equipped with a tri-burst mechanism- it can fire 3 shots per trigger pull.
Being an assault rifle, the M16A1 has two modes of select fire. It can either be fired in semi-automatic, or fully automatic. The M16A3 shares the same trigger group, while the M16A2 and M16A4 have semi-automatic and three-round burst modes.
The M16A1, Diemaco/Colt Canada C7, Diemaco/Colt Canada C8, and M4A1 have fully unrestricted automatic fire. The M16A2, M16A4, M16A5, and M4 are limited to a three round burst.
Yes, the Glock 18 is fully automatic.
Yes, the M14 is capable of fully automatic fire.
The M16A4 is a select fire weapon, but is limited to three round bursts, the same way the M16A2 is.
No, it is a semi-automatic.
I know of no place that permits fully automatic firearms to be used in hunting.
Fully automatic shotgun, no. Automatic rifles and machine guns, yes.
No you have to pull on the trigger every time you want it to fire. But you can easily make it fully automatic.
No. Spring powered means spring powered. Not fully automatic.
No, just semi automatic.
Yes. The M16A2 and M16A4 have the same delta ring and handguard cap, therefore the railed handguard from an M16A4 should fit on the A2.