Great loo9king piece of kit, the most logical solution for mounting an X300 or TLR1 light on an M16/AR15 with a standard fixed front sight base but..... Many modern FORGED Mil-Spec front sight bases have a nasty forging seam and are sometimes uneven on their front surface where the light mount rests. Mine was pretty cockeyed and the light was about 15° off center. I took a file and flattened out the seam which got it much closer to center but not quite right at 25-50 meters because my FSB was slightly uneven(this is common on late production M4s) so I ended up making a shim to get it perfectly centered. If you have an old school 70s colt where the forging is finish ground to be flatter and more symmetrical or you have a budget AR that uses a cast rather than forged FSB you won't have any problem with a perfectly aligned and ready to use light mount right out of the box. I'm glad I bought it and will probably buy another but I now know that it won't be a slam dunk on my newer Mil-Spec rifles with "F" marked front sight bases.

Awesome. Need to buy more..

Works exactly as advertised and at less than half the cost of the competitor. It mates up to the front sight post perfectly and doesn't have any slop or play in it. It wasn't advertised but the QD mount has limited rotation index.

A little bulkier than I thought it would be, but still a great buy.

I have these units on 2 rifles and like the idea of being able to move my Surefire X300U from my Glock to my carbine minimizing the amount of gear I have to keep track of. I bought both of mine for $60 shipped and thought they were a great deal but now that they are $50 I'll just go with separate QD and light rail mounts for my Magpul MOE SL forends instead. Notes: I had a CHF barrel assembly that had a really huge casting seam along the front and it kept the mount of seating properly until I filed that seam down. I covered the filed area with some Brownell's Oxpho-Blue to prevent corrosion and no further problems Be sure to Loctite the screws into position when you torque them down. They can work loose due to the thermal expansion and contraction that occurs on a forged FSB after extended shooting sessions.

Awesome product. Would recommend putting loctite on the screws before putting it on though.

Simple to install, practical and the light is at 12 o'clock.

Works and looks great. Would have given 5 stars but don't see why the QD one is $25 More then the others