Does that help with reducing wear and tear when putting alot of rounds through it?
"M16 BCGs" became popular when so many ARs had 16 inch barrels with Carbine gas system (so extra dwell time vs the 14.5 inch barrel this gas system was designed for). .. that is unless the barrels gas hole was adjusted for that (that is made smaller and it often wasnt) the rifle would be overgassed.
An overgassed rifle is usually not a huge
problem as...undergassed is worse which can cause short stroking so it might affect your reliability in a more direct way... mostly overgassing increases wear on components , especially the bolt ...but most PPL dont shoot enough to ever notice.
The heavier ("auto") BCG can be used just like a heavier buffer to slow things down to adapt to overgassing.. a lot easier than putting in a new barrel (with a smaller gasport)
In general though AR15 BCGs are perfectly fine... since many ARs dont NEED their system slowed down..some are close to short stroking anyway.
Especially when they shoot soft ammo like PMC Bronze of Tula and are tuned closer to a service rifle (that is for M855 and M193).. this will often result in undergassing and short stroking.
Very early in my AR15 "career" I bought a rifle.. it had been assembled all with quality components.
But it would short stroke with PMC Bronze almost every shot and Tula ( which at the time I was still using also)
It needed hot ammo to function reliably (PMX Xtac 55gr is what I used.., a quality M193 clone)
After examination I found:
An H2 Buffer (so 2 steps heavier than normal Carbine buffer) and a "full auto" BCG.
Replaced the Buffer with a Carbine buffer and the BCG for a regular Ar15 BCG and so solved my issue.
(This took me a lot of research since I was a noob back then)
Here is a graphic of what the ejection pattern should look like to tune your ammo and rifle for each other:
On my primary "GO" rifle (which unlike my trainers does not have adjustable gas) when I shoot hot ammo (Wolf Gold) I am usually at 3- 2:30 (which I tolerate)..
The Ammo I shot the most (Wolf Military Classic 62gr) is right around 3:30-4