30-day limited warranty
Things I liked:Fits very snug on my GSG-5 MP-5/22.sits true to the barrel, works pretty well and and hasn't moved yet. After zeroing with a cheap red dot eaotech type sight, I am shooting 1.5 moa, not bad all in all and if actual recoil wont shake it then its definitely sturdy enough for airsoft use.
Things I would have changed:I would have liked to see a version that a little longer, because the claw can only go on in one position, that way a little more sight releif can be achieved. The positioning still isn't horrible though.
What others should know:Easy to attach and sturdy. If you want compact sights, or just suck with irons, this piece is perfect for standard mp-5 variants, and not just for airsoft ;)