- Sep 8, 2017
What is the max you can go with opening up the gas port on an 18" SPR TBox barrel in .223Wylde without asking for catastrophy? It's already at the max-spec .098" with an SLR adjustable block, but it's still short stroking with the block all the way open. Tried different springs, buffers, blocks, etc. Was told to open up the port more, then tune it down with the SLR block. I was thinking a max of .140" (5/64) but unsure. I have opened up undersized ports before to fix issues, but never gone above spec. Just want to know the maximum I can go with this and still be in the safe zone. Thanks.