I have an early SR15 barrel/bcg I'm using.
Its chronically under gassed. Clean its ok, but as it gets dirty in something like a class it slows down and starts fail.
The easy solution is to send it to KAC and have them update it to the newer size. Well, not so easy. I have modified the upper. The gas block has been switched for a pinned Vltor and it uses a Geisselle MK16 rail. KAC doesn't want to see it. They also don't want to tell me what gas port size to get it drilled to. I find this super annoying. The Vltor gas block is a tight fit and does not leak. I am running a sand cut KAC carrier.
So lets talk numbers. What is ideal, what size does KAC currently use? I measured this port at .078"
The gun will reliably cycle 77gr. MK262 clone. M193 will fail to lock back most of the time. I also use speer gold dot soft points in 62gr. and 64gr. and Federal fusion in 62gr., these too are underpowered in this gun.
What i'd like to run:
5.56 55gr.
.223 Speer and federal fusion 62gr.
What does not need to:
All steel cased ammo
.223 55gr ammo like federal or PMC
Where I am can get as low as -30 out, I try no to go out in that weather. I would like it to cycle at -15 F though, this is a more common deep winter day time temp.
It will ware a can some time. Its a sure fire socom 5.56 RC2.
So how much bigger do I need to go? will .08 do it? Is .0078 already big enough?, it appears to be a common 16" mid size. Has any one measured a new SR15?
ETA: I thought about it and re did the math the gas port is already .078 or 5/64. Not the .068 I wrote earlier. I remembered wrong when posting.
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