"Tactical Rifles" are intended for offensive or defensive use at close range, with fairly instant results. Under pressure, tactical rifles are typically used when all other precautions have failed and lives are in danger.
Any rifle made to be used in a tactical environment is a tactical rifle...so, any rifle the Marines have is a tactical rifle.
18 in the US
You would have to define "tactical rifle". In most of the US, no license is required for rifles or shotguns. Full auto firearms must be registered with the US BATFE.
no immediate threat is present
AimPoint, EOTech, Trijicon ACOG.
Cheytac inetvention hands down
Does not exist.
No, it is a spring rifle
360 fps
The best place to get information on the Remington 870 tactical rifle is on the Remington website. Another place to check is firearm forum where any questions or information can be shared through peers.
LaRue Tactical specializes in the manufacturing of custom parts for automatic and semi-automatic rifles. They have a wide range of product such as scopes and rifle mounts.
If it's chambered for the .45 ACP cartridge, yes.
A tactical scope is a telescopic viewfinder for use on a rifle. You can buy one from your local firearm dealer or find one online along with reviews for many popular models.