One of the problems with those "special scopes" is that, as you said 18 inches is an average with a spread that puts you right out of ballistic capability. You are holding fine example of not 18 inches in the chest.
Also a bit smaller then you.
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Hold Hard guys
Rick B.
Knowledge is knowing a tomato is a fruit.
Wisdom is knowing it is great on a hamburger but not so great sticking one up your ass.
Author - Richard.
Experience is what you get right after you need it.
Author unknown.