Just back from Ken Hicks yesterday, who tuned it for the 49.5gr NSA slugs. Both regulators are Huma High Pressure. Both gauges have been replaced with Impact gauges. 580cc bottle, and 700mm barrel with Superior Heavy liner, Anarchy Outdoors grip. Full disclosure-you have to hold the cocking handle back to insert the magazine. $1,400 shipped CONUS in a non FX case. Payment by Paypal, no fees to me.