https://www.youtube.com/watch?v=EjxoCz5XNn8
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Man, that's pretty cool. Basically make your M2 into an A5!
Tried one of these
Then I got a refund
It didn't do what it was suppose to reliably unless you fed the rounds just right. And then interfered with the normal loading of the gun.
And while the box claimed drop in I got told I would have to modify my gun not the lifter. So back it went.