I have a late 90's vintage post ban colt match competition target hbar that has been sitting in the safe for a while. I want to start shooting it again. The trigger has always been the rifle's weak point; it is terrible. I want to install an aftermarket trigger. The lower has a pinned sear block that, as I understand it, prevents many aftermarket triggers from dropping in. Is there a gunsmith in the Portland area that can mill the sear block out? Thanks.