Must be time for the monthly "sear block removal" questions!
Many of us have had the blocks removed. Some have done it themselves and some have had others do it for them.
One of the best is Kurt's Kustom Firearms. He's done two for me. Price is based on how many pins are holding your block in.
And you don't have to justify removing the block because you can't do this or that to your receiver. There is no federal or state law mandating it, therefore you aren't breaking any laws by removing it. Even the ATF agrees with this. Colt put them in to be PC, period.
Save the block and have it chromed or gold plated. Makes a nifty trinket.