Joules are the international unit for energy, and 21 joules is equal to about 15.5 foot-pounds, which is the unit used for ballistics in this country. A 7.7 grain lead pellet (assuming .17 caliber) that has 15.5 foot-pounds of energy will be traveling about 950 feet per second.
That's a pretty zippy pellet rifle, plenty to put down game smaller than a bunny. If you brain a groundhog with that you might put him down too, but good luck, ghogs are tough.
There are licenses and licenses. You can get a firearms owner's ID that will permit you to purchase and possess a rifle, shotgun or bb/ pellet gun at 18. A handgun permit is 21. A permit to CARRY a concealed handgun is 21.
1 cal=4 joule. 84 joules=84/4=21 cal
Israel
Ask This Old House - 2002 Installing a Pellet Stove Gasoline-Free Lawn Mowers 6-21 was released on: USA: February 2008
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.
21
18 to buy a rifle or shotgun, 21 to buy a handgun or assault rifle.
Yes. You have to be at least 21. Mentally, that is...
Yes
18 for a shotgun/hunting rifle, and 21 for a handgun.
The JC Higgins Model 21 is a pump shotgun, not a rifle. Reassembly should be done by a competent gunsmith.
Winchester Model 416 Rifle (Not a gun): Smooth bore barrel. Double pull trigger, 363 Feet per second: original cost $21 Excellent condition=$50 Good= $25 to $30 Fair=$15