I bought a used M&P 9 that looks like a 2010 model. It has the older sear housing block with the tiny sear return spring and plunger. Do they make a sear housing block with the larger spring and plunger for the frames without the cutout for the thumb saftey? This gun just has the plug for the lock, but no lock.

Also would switching out to the new style trigger bar and slide lock eliminate the need for the Apex RAM?

Thanks!!