Not a drip in - Sniper AR .308 Quad Rail Handguards w/Triangle End

I had to remove about 2-3mm of material from the rail in order to get it to slip into the delta ring. It's possible the armalite ar10a pattern delta ring is different but I'm not sure who else uses a midlength handgard with a triangular end. Works as intended with a little elbow grease.