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Discussion Starter · #1 ·
Will a SIG 516 cycle subsonic 5.56 ammo on adverse setting? Is the port big enough? Is the buffer light enough? Is the spring floppy enough? Has anyone tested it? With what brands of ammo/buffer/buffer spring?

And please, don't tell me to buy a 300 BLK upper... I know that subsonic 5.56 has .22-ish performance, but I'd like to have that option :p.

Ronin
 
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