Indicates a model change from the original. The original might be a Model 1911. When it has a design change, it is now a Model 1911A1.
Colt 1911-A1
The mean of the numbers a1, a2, ..., an is equal to (a1 + a2 + ..., + an)/n. This number is used mostly as the average. It is called the arithmetic mean.
Colt makes a 1911-A1 Pellet gun made by Umarex. I know of no BB gun unless you are asking about an Air Soft gun. The Pellet gun is very good. I can not answer about an Air soft gun.
History of Marlin by Brophy; Blue Book of Gun Values
(a1+a2+....+am )2
it was modified................
A stands for alteraion and 1 means the first alteration to the gun. mk means mark so mkI would be mark one or version one so to speak.
You could mean a cell reference, such as A1. You can also give cells a name to make them easier to remember and then reference.You could mean a cell reference, such as A1. You can also give cells a name to make them easier to remember and then reference.You could mean a cell reference, such as A1. You can also give cells a name to make them easier to remember and then reference.You could mean a cell reference, such as A1. You can also give cells a name to make them easier to remember and then reference.You could mean a cell reference, such as A1. You can also give cells a name to make them easier to remember and then reference.You could mean a cell reference, such as A1. You can also give cells a name to make them easier to remember and then reference.You could mean a cell reference, such as A1. You can also give cells a name to make them easier to remember and then reference.You could mean a cell reference, such as A1. You can also give cells a name to make them easier to remember and then reference.You could mean a cell reference, such as A1. You can also give cells a name to make them easier to remember and then reference.You could mean a cell reference, such as A1. You can also give cells a name to make them easier to remember and then reference.You could mean a cell reference, such as A1. You can also give cells a name to make them easier to remember and then reference.
=AVERAGE(A1:A34)
oil change due
There is no cell A1A2. What you may mean is A1:A2 which refers to the range consisting of cell A1 and cell A2.
The Colt 1911 A1 is rated at 395 FPS (Feet Per Second)