I just got that exact same SARCO stock and will be building up one of my own this summer.
I don't like the Tech Sights, though. I'm going to use real M1 carbine sights, front and rear, on mine. Might also be using a real M1 carbine front band instead of the cheap SARCO copy.
If I would have built this purposely, I may have done what you plan on doing, but for me, for now, it will work and be fun to fiddle with..... It has the factory trigger, which is terrible.
I do have all the original parts, plus 3 ten round mags and a BNX 25 rounder. Also came with a Hogue overmolded stock in OD green.
Not a bad package all and all....