Well, I'm still trying to find the 357 SIG barrel for my M&P Compact (1.0)...
But I just (FINALLY!) received the long-awaited EFK Firedragon 357 SIG barrel for my FN FTX and I now get to see if I like that better than that in the M&P PC C.O.R.E., which I just love!
BTW, that barrel is a work of art! Just beautiful! Only have a hundred rounds through it, but it seems to be very accurate and was well worth the wait... Chamber seems to be very tight, as in an almost "match" configuration?
357 SIG is just an excellent caliber to shoot & reload, IMHO.
Cheers!