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Cartridge choices for AR15-based SBR

Posted: Thu Dec 27, 2018 6:21 pm
by mbogo
What do you folks like for an AR15-based SBR?

I've already got 10.5" uppers in 5.56 NATO and 300 AAC Blackout.

mbogo

Re: Cartridge choices for AR15-based SBR

Posted: Thu Dec 27, 2018 9:24 pm
by poikilotrm
Is this just a fun gun/ noise maker, or does it have a real world purpose?

I can speak from experience with regards to a 10 inch barreled AR in 5.56. They have the same MV as a .22MAG, and they don’t go through windshields worth a damn.

Re: Cartridge choices for AR15-based SBR

Posted: Fri Dec 28, 2018 1:10 pm
by mbogo
It will be a plaything unless I can find a practical use for it.

mbogo

Re: Cartridge choices for AR15-based SBR

Posted: Fri Dec 28, 2018 1:13 pm
by fishman
For extra smallness, yet still retaining ballistics, 45ACP.

Loaded with 450 SMC ammo, a 45ACP carbine is worthy of deer hunting, with a 185 grain bullet going 1500-1650 fps. Way better than 556 with a sub 10" barrel, and way harder hitting than 9mm. Also consider 38 super and 10mm.

For punching paper, 9mm is tough to beat.

Re: Cartridge choices for AR15-based SBR

Posted: Fri Dec 28, 2018 5:30 pm
by crazyelece
My favorites:

8-10" 300blk
5.5" 9mm
4.5" .22lr
7-10" .223

the top three also being excellent suppressor hosts

Re: Cartridge choices for AR15-based SBR

Posted: Sat Dec 29, 2018 6:30 pm
by CanOfWhooppass
In addition to what is mentioned I'll add 12.5" 6.5 Grendel makes for great fun ringing steel at distances not expected from a SBR.

I had a 10.5" 458 Socom that was a blast, but went up to a 16.5" barrel so no NFA hastles when traveling. Seriously hard hitter on tough game if shots are not too far.

Re: Cartridge choices for AR15-based SBR

Posted: Sun Dec 30, 2018 2:19 pm
by mbogo
I've got a 16" Tromix upper in .458 SOCOM.

Re: Cartridge choices for AR15-based SBR

Posted: Tue Jan 01, 2019 6:19 pm
by mbogo
Based on the recommendations received here and elsewhrere, I've ordered a 12" Grendel upper from Palmetto State Armory. See https://palmettostatearmory.com/psa-12- ... 49195.html
for specs.


$329.99 with free shipping AND today, shipping on the ASC 25rd. magazines is free if your order five of them. :mrgreen:


mbogo