Supposedly barrels made with ECM (which takes about $200-$400 in initial investment to make, and under $20 per barrel thereafter) are about comparable to factor

Supposedly barrels made with ECM (which takes about $200-$400 in initial investment to make, and under $20 per barrel thereafter) are about comparable to factory made barrels in accuracy. So not going to win any marksmanship competitions, but good enough for ordinary use. The FGC-9 uses ECM to make the barrel.