Start up Tooling costs vs. volume and your return on investment.
Springs: Been in a couple factories and pretty neat stuff watching them be cranked out. A whole lot smarter to go directly to an OEM where you can give them specs to meet your application. Coating / heat treating, etc. Unless you can utilize the tooling and sell
LOTS of springs to other customers, it doesn't make any sense / cents.
Grips: I would assume these fall under injection molding. Again, it's a relatively inexpensive part and other mfg's already have the tooling and dies. You need coolers, regrinders for the flash, etc (I also doubt they are turning the grip screw and making fasteners.)
I could be corrected here, but I would assume one would also need stamping machines and die casting tooling for the rest of the lpk.
Remember, the same piece of tooling can crank out quality and marginal parts. Example: Eley 22 long rifle rimfire has only 4 or 5 machines that mfg. their entire line of products from entry practice ammo to their match stuff. It's the components (raw material), rate of output and QC inspection along the way.
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