sand bag
A stand to support a rifle.
Support
sandbaq
Tripod....................... ================ ACTUALLY, a tripod would be used for a crew-served weapon, such as medium/general purpose/heavy machine guns. For a rifle, you're probably thinking of either a bipod or a benchrest.
Well, yes and no. Support should go under the forearm, not the barrel. When a support is placed under the barrel, it MAY change the point of impact. The pressure of the forearm on the barrel may change, and the normal vibration of the barrel is changed. For a hunting grade .22 rifle used to 30 yards, you probbably would not see a difference. For a long range target rifle used at 500 yards, you WILL see a difference.
The British made 'Baker Rifle' was the first widely used Infantry rifle in the early 1800's
The ruger rifle
You can build a rifle tridpod by using a camera tripod with a special base to support the rifle. There is an article on how to build one at: http://www.snipercountry.com/Articles/SniperSaddle.asp
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The rifle was the main gun of the Infantry man so every major battle in WW 1 the rifle was used.
Sorry- there are dozens of terms used in rifle shooting. Can you be a bit more specific?
The Ross Rifle, I believe. It turned out to be faulty.