I never understood the gun prohibitionists’ preoccupation with bayonet lugs on AR-15s. It seemed every one of their attempts at an “assault weapon” ban included this feature as a disqualifying feature. Only the US Marine Corps still has bayonet training in our military as the Army has abandoned it. The last major US military bayonet charge was during the Korean War. I will note the British Army did very effective bayonet charges in both Afghanistan and Iraq.
Mike Williamson examines a number of the bayonets for the AR-15/M-16 in his Sharp Pointy Things YouTube below.
I have a surplus M-7 bayonet as well as a surplus M-9. I think, without checking, my M-9 was made by LanCay and not Phrobis. That said, I am very envious of Mike’s modified Swiss Pioneer bayonet!
If you want to learn more about bayonet fighting, there are many free manuals on the Internet. You can bayonet training manuals for the armed forces of many countries including the US, Japan, and the UK. They make for interesting reading.