18 in the US
Does not exist.
"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.
18 to buy a rifle or shotgun, 21 to buy a handgun or assault rifle.
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.
18
18
Have never heard of an underwater assault rifle. In the US, you must be 18 to buy a rifle, and 21 to buy a fully automatic rifle.
18
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.
you can tell how old a rifle is buy finding who made the rifle,the model number and then the serial number.with that info then you could ask that question just like you asked this one.