Willie Lowman
New member
For years my main home defense firearm was a 14.5" Noveske AR loaded with Winchester bonded 64 grain JSPs. Seemed to me that it would do well against any critters that threatened my chickens or any ner-do-wells that came into my home to do harm to me and mine. The carbine is handy, short enough to move through the house with, accurate at 200 yards for shooting coyotes. What's not to love?
Well a few months ago I had an eye opening and ear damaging experience when I fired my .44 mag inside my barn.
https://thefiringline.com/forums/showthread.php?t=610107&highlight=shooting+indoors
So with the information that was shared in that thread about pressure and powder volume I have decided to change from the AR to my 9mm MP5.
From all the tests I have seen 9mm JHPs preform pretty well from a 8 inch barrel. They expand well and penetrate within the FBI recommended depths.
But more important to me 9mm from a longer barrel (especially when fired inside) is not going to be as earth shattering loud as 5.56 from a shorter barrel. The MP5 is even shorter and handier in the house. It is accurate to about 100 yards with the AimPoint.
Then there is the ever looming specter of over penetration. People always bring it up. In my opinion any round worth shooting someone with is going to go through a great deal of dry wall. 15 to 20 sheets from what I have seen for both 5.56 and 9mm. So it is what it is. One isn't really better than the other as far as I can tell. (Yeah 45 grain .223 varmint rounds over penetrate less but they don't pass the FBI gel criteria.)
So that's my decision. I have chosen to go with a 9mm SBR instead of a 5.56 carbine.
Well a few months ago I had an eye opening and ear damaging experience when I fired my .44 mag inside my barn.
https://thefiringline.com/forums/showthread.php?t=610107&highlight=shooting+indoors
So with the information that was shared in that thread about pressure and powder volume I have decided to change from the AR to my 9mm MP5.
From all the tests I have seen 9mm JHPs preform pretty well from a 8 inch barrel. They expand well and penetrate within the FBI recommended depths.
But more important to me 9mm from a longer barrel (especially when fired inside) is not going to be as earth shattering loud as 5.56 from a shorter barrel. The MP5 is even shorter and handier in the house. It is accurate to about 100 yards with the AimPoint.
Then there is the ever looming specter of over penetration. People always bring it up. In my opinion any round worth shooting someone with is going to go through a great deal of dry wall. 15 to 20 sheets from what I have seen for both 5.56 and 9mm. So it is what it is. One isn't really better than the other as far as I can tell. (Yeah 45 grain .223 varmint rounds over penetrate less but they don't pass the FBI gel criteria.)
So that's my decision. I have chosen to go with a 9mm SBR instead of a 5.56 carbine.