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I am using this on a couple of different Midwest Industries handguards. Unlike the other reviewers I did not experience any looseness at all...in fact I was surprised at just how snug it fit and locked up.
Overall I'm impressed and wish I'd known about KDG before I'd bought my bipod mounts for the MLOK rails as I could have just bought the one from KDG and been able to swap the mount and bipod back and forth instead of buying two of each.
I was using receiver vise blocks previously, which did leave marks on the receiver, not a big deal but it does illustrate the amount of force being applied. I recently used this for the first time to swap out a barrel and am very happy I had this instead, the amount of force I had to put on the wrench to break the barrel nut free would likely have twisted or bent my receiver. Also being able to re-position the receiver at many angles in the vise was great, allowing me to work on the sides and bottom of the completed upper. Another small but helpful benefit is that you don't have to remove your optics to use this.
I had been employing the vise and punch method of installing sights on my M&P for the past couple of years which worked ok, aside from marring the sight. I finally broke down and bought this since I was installing a tritium sight and didn't want to risk breaking the vile. It is easy to use, doesn't damage the sight and it was great being able to adjust the sight left or right tiny amounts to center it. Also...it worked on my Glock 26 rear sight which was an added bonus!
So at over $100 it might be hard to justify but when you factor in that it will keep from damaging expensive sights and works on more than one make/model of gun, it really is fair.
The tool itself is very well made, it is solid and tolerances are tight.