LX and its inconsistency *sp??

[Doc_Shock]

I currently have a LX (1.5 carrier, 2 shims, and medium spring) on my 68 classic and some other junk.......ne wayz ...Just recently I have come to the point where in heat of the battle and the trigger being mashed as fast as i possibly can the bolt just seems to vent , thus throwing a ball out the barrel and then falling onto the ground. I took the gun home , oiled it up and ensured there was no paint in it this time.....Same thing happened maybe a good 4 to 5 shots then pssssst and then its okay....The velocity is set to a solid 250 and the trigger set up is a intellifeed anyone have an idea what the problem is or an idea that would fix it?? I originally thought it was the carrier sticking but when i changed to the next largets one it leaks...... Please Help thanks

[Havoc_online]

shooting at that low of a velocity is what's hurting you. LX kinda complains at that low of velocities. You could goto the stock spring that'll be more reliable.