I just purchased a Remington 1911R1 Stainless. This is not my first 1911. I have a Wiley Clapp Colt Commander and a Colt New Agent 9mm. I bought the Remington to customize I would like to make a couple of upgrades to the 1911R1. I would like to install a larger beavertail safety and safety. I was also thinking about a beefier main spring housing. Is there a better place than the normal MidwayUSA and Brownell's to buy parts? Where is the best place to send the frame to have some checkering done? Thanks for the help!!