one
3 round burst is not useless it is good for killing people or a few people at one time
that is why you can not just go down to a gun shop and buy one
two
a ar15 is a m16 that is a civilian model and only semi auto
there not .22 there .223 or even 308 or bigger you can buy a m16 semi auto only gun i have saw them not to many around and there costly one i saw was form the 80s and they wanted more then two ars would cost.
Issue three most people do not know this the first m16s where called ar16s due to the ar meaning assault weapon i think
They changed it just like the military does everything to m16
From what i have been told you do not want to use any m16 parts in a ar.
Seems like to me the only reason is so you could add everything but the selector switch then add it later and remove it which is illegal.
Again most any ar15 part you will find cheaper easier online then at a dealer unless the do AR or m16 on a large scale
Also when i had my AR i shot it so fast semi auto sometimes.
I would pull the trigger faster the the bolt came back and it would need a second pull so you can shoot a semi auto almost as fast as a full auto.
Stick with AR parts and stay out of prison .
ORIGINAL: M77man
ORIGINAL: the_sandman_454
The biggest difference is the M16 is capable of burst or full automatic fire. The AR15 is the civilian (read: semi-automatic) version of the M16. To stay legal make sure you don't use any M16 parts that would convert it to automatic fire.
You might be able to find an M16, but it'd have to be produced prior to the late 80's machinegun ban unless I'm mistaken. It would also cost roughly the same or more as a typical small car.
Are you referring to the A1 or the A2? I don't know the characteristics of the A1 but I do know about the A2 and the A2 is not fully automatic. It's semi-auto or with the flip of a small switch becomes a 3 round burst (which is worthless). Also, I don't know about the AR 15 either but the M 16 holds up to 30 rounds and is a sweet little .22 that is capable of hitting a torso at 500 yards using nothing but a peep sight and well tightened sling tied to your arm like a turnakit.