PDW trunk gun quest

[LR1955]

Fellers

I am looking for a "good" personal defense, cr4p hits the fan, trunk gun. I'm not interested in an AK47 since I primarily own AR15s or bolt guns. I know there is a lot of disinformation out there and I'm trying to weed through it all.

My expertise has been in M61A1 Vulcan when it comes to gun employment...so I need some help here.

My considerations:

1. 5.56 Nato - I've been told there are windshield penetration problems (true or false?). What round would be best?

2. Grendel - what round would be best?

3. 5.7mm x 28 - (I currently own an AR57, but am concerned about windshield, metal penetration). I like the 50 round magazines, but the only ammo I have is the -197SR.

4. 300 AAC Blackout - overkill?

I figure 16" barrel because of the legal ramifications of someone (wife, child) borrowing the car (or 14.5" with perm attached muzzle device).

I'm currently reloading with Grendel, and have the setup for .223. I had considered reloading 5.7x28, but that is not an easy round.

Thoughts?

BF16:

You stated ""good" personal defense, cr4p hits the fan, trunk gun."

If the 'cr4p hits the fan' scenario occurs, peculiar and uncommon cartridges will be of no value to you. Stick with the 5.56 as it is a very common cartridge and parts for 5.56 AR's are readily available -- such as bolts for when (not if) you shear a bolt lug.

If you start blasting at someone who is behind a windshield in a vehicle -- I figure that person would, as a minimum, become quite distracted seeing as how he is witnessing his windshield disintegrate in front of his eyes. From the flanks, any 5.56 bullet will go clean through anything but an up armored vehicle. And, I doubt a Grendel would do any better as the velocities of the Grendel's are immensely slower than a 5.56.

So, get a reliable 5.56 Carbine, a M-68, a rack and eight or so 30 round magazines of the issued M-855 and you are set. Won't win the National Championships with one but it will do the job in the conditions you identified. And, you can find ammo and spare parts over the entire country.

300 AAC Blackout?

LR55