I have a 16 inch x39 build that is freaking awesome. CLGS with a port size of .093. Running a standard carbine spring and an H2 and is cycles flawlessly.
Currently in process of building an x39 SBR with an 11 inch barrel. CLGS with unknown port size (it's in the mail currently) but will make sure it too is sized at .093. I want to go A5 with this one and am planning on using a sprinco green. Looking for thoughts on buffer weight. I am thinking the 5.3 oz should be ok. Shooting mostly steel cased but do run brass as well. My thought is gas pressure at the port should be similar between the 11 and 16 but this is just me making some assumptions. Anyone have any thoughts on this? Worst case scenario I have a buffer collection at the end of the day.
*Update* I bought the barrel from KAK and sent them an email asking about port size. Just got a reply back from them that it's .078.
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