Personally, the front end of the kit just never fit my eye. I was able to get the rear half from TNW and built my version up. My only concerns with the kit is the scratch made back plate and buffer not being sufficient for full auto fire.
With other back plates I have, whether GI grips or spades, they go into my gun(s) without any looseness.....I don't have to force them but the backplates snugly fill the the cutouts in the back of the receiver. The TNW custom made adapter backplate is a little loose side to side in the grooves AND it was made WITHOUT the 2 feet on either side of the trigger which engage the bottom plate. Further, the buffer plunger and spring are non-standard parts.....not an issue per se, except the spring is soft enough to feel give with thumb pressure. I have noticed a bolt impact pattern on the backplate and that is not good.
I have jacked the spring with some spacers, but I think the ultimate resolution is a backplate made with "prouder" tongue dimensions, the 2 bottom plate feet and provision to use a standard buffer plunger and stouter spring.