Works as advertised - Yankee Hill Machine Picatinny Vise Jaws YHM-7350

I purchased this to assist in a build of a 10mm AR pistol. I was unprepared for the distortion of upper receiver when torquing the barrel nut but it survived and the weapon works fine. It otherwise does a perfect job squaring handguard rails to upper rails whilst aligning the two and tightening the hand guard screws and or jam nut. Very heavy duty construction and good fit and finish. A little pricey but works very well. I don’t mind price as long as it does what it says it will do, and this does.