Pistons and violent early extraction...
So I have a quick question regarding piston operated uppers.
In a normal D.I. upper, as gas is imparted into the gas tube, it travels down through the gas key, into the cavity in the carrier, and pushes the bolt itself forward. This eases extraction while also thrusting the BCG rearward. So essentially the gas is used to force the carrier rearward, bolt forward, rotate and unlock the bolt from the breach, then extract the round as it travels rearward.
However, in a piston system, the gas key is replaced with just a flat piston key which the short stroke rod impacts and forces the BCG rearward... so there is no forward motion of the bolt to help unlock and ease the stress on the lugs right? It just rips it right out... which to me sounds very detrimental to the system... it extracts the round before it may be at the optimal size to extract ( forward motion of the bolt by a D.I. system provides sufficient time for the case to cool and shrink) and it just shoves the carrier to the rear and basically just rips the lugs out, causing them to sheer against the extension lugs until they eventually unlock and allow the bolt to leave.
Basically piston systems just use brute force to rip the bolt/shell out of the chamber... seems to me like carrier tilt would be a drop in the bucket compared to the stresses that type of action has on the rifle, so the various retro-fit kits available would be about as beneficial as using a filled diaper to lube your gun...
Is this assessment correct?