Its what it is... - Guntec USA AR-15 A2 Rifle Buttstock Screw

its a buttstock screw, not alot to it. while i always replace them everytime i mount/ remount my buttstocks this one did stand out because during a weeklong training event i forgot my spare parts bin and had to reuse this screw about 20 times with different setups to see what would work best for me and it shows no damage/ stretching, slight wear on the finish but torqued down perfectly each time and on my last stock iteration i left it in there and it has remained to this day without issue; 3 years 9k rounds and change.