In military drill and cermony, the comand of "stack arms" is the command for every 3-5 men to place their rifles in a vertical 3 point stack, muzzles up.
The military may "stack arms" when in the field, soldiers need to put down their weapons for an extended time, but you don't want to lay the rifle on the ground. 3, 4, or 5 rifles are grouped into a tripod, either using a hook on the rifle (called a stacking swivel) or by sticking the barrels of two rifles through the sling of a 3rd.
Commonly called the Carcano, this was a bolt action military rifle that fired a 6.5mm bullet. It was the standard rifle of the Italian military for many years. It was also the type of rifle reportedly used to kill President John Kennedy.
The U.S. military built a magnet-powered rifle, called a rail gun.
The military just followed there nomenclature because the previous US military battle rifle was the m-14.
card stacking or stacking cards
Yes- stacking is performed using the sling of one rifle tha is placed vertically, and two other rifles with the flash suppressors inserted through the loop of the sling of the vertical rifle.
Military rifle made in Spain
No reference for a savillion rifle. If you mean civilian, same as for a military rifle- it will depend on the caliber and barrel. Military rifles in the US are made by civilian companies.
It was first made by the ArmaLite Corporation. When adopted by the military it was given a government designation of M16.
The Springfield Armory M1A rifle is the commercial variant of the military M14 rifle, chambered in 7.62x51 NATO. this is essentially the same as the .308 WIN chambering of the commercial M1A.
Military, Police, Civilians
No