These have been tested in Daystate factory barrels, LW and TJ barrels with great success. Other barrel testing coming. At this time, we do not expect these to work in original smooth twist FX barrels but should be OK in the new X barrel by FX.
DO NOT BUY THESE OR ANY SLUG FOR A SMOOTH TWIST FX BARREL!
Length is .266
Diameter available in this slug: .177
Do not use in .172 barrels