I just ran across this new blog post on the issue. It appears the ATF may have altered their position. It is not an issue directly relevant to me right now, but I thought some of you might care.
https://blog.princelaw.com/2019/07/05/a ... ing-brace/
Firearm length measured with stabilizing brace?
Firearm length measured with stabilizing brace?
“Democracy is a pathetic belief in the collective wisdom of individual ignorance.”
Many folks feel that by using a brace on what would usually be a rifle gives them carte blanche to do what they want with it. Adding the VFG is one of those things. I'd like to know if anyone has actually been charged with anything related to a VFG on a "pistol" or similar. We read articles about machineguns and now those Wish Glock switches, but not grips.
There are more & more angled foregrips and handstops coming out every month. A VFG on an AR pistol is like the inverse of curbfeelers on a coalroller, IMHO. YMMV. 
Clipped from the linked article - this is the important stuff:
Clipped from the linked article - this is the important stuff:
Based on this letter, it is safe to say that ATF is taking the position that firearms equipped with stabilizing braces need to have their overall length measured with the brace folded or to the end of the receiver extension if the brace is stationary and non-adjustable. Adding a vertical foregrip to a firearm that has an overall length of less than 26 inches results in the making of an AOW, which is subject to the National Firearms Act.
....and some rin up hill and down dale, knapping the chucky stanes to pieces wi' hammers, like sae mony road-makers run daft - they say it is to see how the warld was made!
Saint Ronan's Well - Sir Walter Scott, Bart. (1824)
Saint Ronan's Well - Sir Walter Scott, Bart. (1824)