https://www.machinegunboards.com/forums/index.php?/topic/22248-m60e3-conversion-to-e1-parts-needed/&do=reportComment&comment=205032
M60E3 conversion to E1 Parts Needed? - The M60 General Purpose Machine Gun - MachineGunBoards.com...
https://beltfeds.com/product/m60e3-e4-front-sight-tips/
M60e3 / e4 Front Sight Tips - BeltFeds.Com, LLC
Apr 28, 2023 - M60e3 / e4 Front Sight Tips. Condition - NOS
front sighttipsllc