Waste of time and money. Who ever heard of "lapping" aluminum? Stoner designed this weapon with RAM Logic so it could be maintained in the field without a myriad of precision toola and specifications. The Army figured out long ago that any M16 out of the rack can be issued to a non-shooter along with 8 hrs of basic markmanship can achieve battle sight zero and engage and hit targets at 300-350 meters away with open sights.
Waste of time and money. Who ever heard of "lapping" aluminum? Stoner designed this weapon with RAM Logic so it could be maintained in the field without a myriad of precision toola and specifications. The Army figured out long ago that any M16 out of the rack can be issued to a non-shooter along with 8 hrs of basic markmanship can achieve battle sight zero and engage and hit targets at 300-350 meters away with open sights.
It is not a waste of time if accuracy and reliability is the goal..Not all upper receivers are square to the barrel and lapping them corrects this..
Should’ve used backspace for your entire comment.