Colt - would be your best bet if you want a name brand - and something reliable.
pof-USA hands down
From 2013-2015 it has been the AR15.
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.
the brand "swag" is the best out there
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
The best brand of paintballs are Marballizers.
The best brand is often a personal choice. Many people consider the Lenox brand to be the best.
forget the brand name homemade are the best