I have an olympic arms Ar in 45 acp.I would really like to replace the factory barrel BUT I haven't been able to find anyone who has a 45 barrel that the olympic arms bolt will fit.I have tried a barrel from Dead shots but the barrel extension isn't changeable--the oly barrel extension has a feed ramp cut into it and the bolt inserts into the extension so---any suggestions?None of my local smiths have been any help.
