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If your AR pistol has an overall length of greater than 26" you can add any kind of forward grip you want.
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Just to make this clearer - the way federal law defines firearms a "pistol" is by definition concealable and the BATF has ruled that any firearm over 26 inches is not concealable. Thus, a firearm which does not have a shoulder stock but is over 26 inches in length is neither a rifle nor a pistol nor an AOW - it is simply a firearm. A semi-auto version of the M-1919A4 BMG also falls into this category.
Back to the original topic : When I built my short AR I went with an 11.5 inch barrel in 6.8X43mm (also known as 6.8 SPC). This round was designed for optimal performance from short barrels so it only loses about 10-15% of its potential in this shorter barrel. That is a lot more performance than either a handgun round or the 5.56 in the same length of barrel.