[KBurdo]

Get a Kel-Tec Sub-2k and use Glock mags!

Whole reason why I wanted one, too many "ifs & questions" for those conversions kits.

The longer barrel of a pistol caliber carbine seldom gives you any significant velocity increase. Here is an example where tripling the barrel length gained 15-fps:

More often than not pistol caliber carbines are purchased so the buyer can pretend he has a submachinegun.
Granted, a 9mm version of the AR can be useful for indoor practice at ranges that cannot or will not accommodate rifles. Otherwise I see little use for something the size of a carbine that shoots pistol ammunition.

I like to pretend and make machine gun noises when I go to the range. Some it's on my couch.

 

[KBurdo]

So is there a difference between a AR carbine than a keltec sub 2000 other than platform? Seems that if you where going to add a longer barrel to a glock, you'd be better off with any carbine so the stock would given you more control & support ?