I've got one on my Armalite HBAR. It works great if you've got a vertical grip on the forearm. A little heavy toward the front, but that makes it hang correctly from a single point sling.
Balance is OK, it is handier.
It still suffers from the flaw of all collapsing stock AR models.
The receiver extension, (buffer tube), is left too exposed.
Drop the rifle just right, fall on the weapon just right, butt stroke an opponent or use the weapon to batter a door open and you risk bending the tube and rendering the weapon out of commision.
I have one on a rifle with a Bushmaster A3 upper, 20" Govt-profile 1:7" barrel with A2 FH and bayonet lug. It balances ok, I'm only 5'8", so I like the adjustability.
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