Originally Posted by
TMS951
I have an early SR15 E3 upper.
It would not cycle some cheaper 55gr. Steel cased ammo, even with the supplied carbine buffer, it never cycled this ammo reliably even with a hot gun in the hot summer. It also would not cycle quality .223 ammo (Prvi 75gr.) in the cold. Because of not being able to further reduce buffer weight I was only able to reduce carrier weight. I purchased and installed a JP lo mass carrier. This fixed my problem. To further tune the system I went to an H buffer. An H buffer + JP lo mass carrier still weighed less than the milspec carrier and carbine buffer combo, but it allowed the gun to cycle my training ammo, and other ammo in the cold.
I only did this to fix a problem I had due to the gas port size of this gun. I believe since then the gas ports have been increased and this problem no longer exists. I you don't have a problem I probably wouldn't change anything.
When not running this ammo, and running 5.56 I went back to a full weight carrier and an A5 system with an A5H0 buffer.
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