If loaded, just release the safe, aim, and shoot. Beware not to keep your face close to the gun when shooting for you could get hurt.
Yes
Depends on markings on upper.
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.
That's a smoking deal on the Mosin-Nagant. That's the one I'd go with.
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
Depends on the ammo, the range, and the construction of the walls and the armoured cars. Most basic family homes - siding, insulation, drywall - won't even stop a regular handgun round.
By it's serial number. Go to www.proofhouse.com and under 'long rifles' listing look for AR15 Sporter
The typical AR15 fires the same type of bullet as the M16: a .223 caliber (5.56mmx45mm NATO) round. There are AR-15 rifles that have special barrels made for a variety of popular cartridges, even the little .22LR.