Groo here
DO NOT use the center of the back carry!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Think about falling down on your back and hitting a piece of metal
[aka gun] with your spine!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
IF the holster was made and worn to to sit on either side of the spine
that would be one thing...
BUT most dont take this into consideration.
Even single is not so good...!!!!!!!!!!
Two holsters worn at 4 or 5 oclock and 7 or 8 oclock
would be much better.
Tried it fell down walking in woods ,limped home, many adult
drinks later fell to sleep , got better in about 3 days.....
PS many trainers don't like butt forward as if correct draw is not used the gun is pointing at you.
Take the time to train well.
My friend and I used such butt forward carry with single action revolvers
Worn at 4 oclock it is most comfortable.
Just train not to cock the gun till it is clear of holster and barrel pointed forward.