Your local police can give you a correct answer.
As many as the magazine is capable of holding.
You must be 18 years of age to purchase a shotgun or rifle,and you must be 21 years of age to purchase a handgun.
With enough time and money anything is possible, but, I wouldn't try it.
Try AR15.com Try AR15.com
If it is one of the recent Colt .22LR AR15 rifles, then the answer is no - they are completely different internally.
1959
Yes
The US Army presently uses the M4 carbine, a shorter and much modified version of the Armalite AR15.
Colt has not offered a AR15 in 308
By it's serial number. Go to www.proofhouse.com and under 'long rifles' listing look for AR15 Sporter
Its ar15
@ 40 inches.