Necessary for acog carry handle mount - Trijicon TA30 ACOG Extra Screw & Washer Set

This screw and washer set is needed to mount your ACOG (I got a TA44 1.5 zoom 400330 red circle dot with mount that allows iron sights to be used) to an AR15 carry handle. I put it on a H&R TIA 10” barrel upper receiver. The kit comes with an Allen wrench that has an extra short, short side to fit in the carry handle open space. The combination of screw, the locking washer and the washer the fits the contour of the underside of the carry handle is very minimal in hight and looks good and low profile. Instructions say it doesn’t take much force to tighten. (The ACOG took good pressure to push it into position on the carry handle). It’s not going anywhere.