Supersonic and Subsonic flows react completely opposite when encountering nozzles, diffusers and orifices.
https://en.wikipedia.org/wiki/Compre..._Laval_nozzles
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Yeah, due to the early unlocking relative to longer barrels and gas system lengths, I suspect chamber dimensions may play a larger role in SBRs than in their bigger brothers.
Regarding Mark's observations on SBRs, I've found that as well that each barrel is its own animal to a degree when dealing with different manufacturers, even quality ones.
I think this is where it is critical to have a properly bored 556 NATO chamber for an SBR.
"That thing looks about as enjoyable as a bowl of exploding dicks." - Magic_Salad0892
"The body cannot go where the mind has not already been."
Surprised I haven't seen gunsmiths offering to 'comp' a barrel by drilling holes at the end to reduce gas. Easier than chopping and you don't have to re crown and thread
Additional question. Is it possible for a port to be welded and redrilled with no detrimental effects?
Full disclosure I dont know sciency engineering stuff lol
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