Just out of curiosity, I’m told if a rifle has problems failing to eject, some add a heavier buffer and spring. Seems backwards to me, as a lighter one gives more velocity since the cycling of the gun has less resistance.
Apparently this is not the case though, can some please explain why heavier buffers and springs can cure eject problems?
Heavier reciprocating mass, whether it’s through the use of a M16 BCG, or adding weight to the buffer, delays unlocking of the bolt, which gives time for the pressure in the chamber to drop and the cartridge case to un-obturate (if that’s a word), easing extraction. Springs tend to fix different problems than extraction problems.
Ejection is a separate issue from extraction, but overgassed guns are often mis-diagnosed as ejection problems when it’s an extraction problem.
I’d start with a properly ported barrel.
Then almost any buffer will work with a regular spring and a regular BCG.
A Rifle buffer/Rifle spring, an H2 Carbine buffer/Carbine spring, and the A5 buffer/Rifle spring are straight down the middle of the fairway. Those are where a properly gassed gun should run best.