Ultralight Ultralight Rifles

[Taudisio]

Another questions since this thread has most of the info on Ultralight and the various parts options.

TN arms carbon lower. FarrowTech butt and A2 buffer. I ordered the tap from farrow tech for the rear takedown retention pin hole. Tap is 4-40 and almost slides right in the hole without resistance. Screw doesn’t touch a thing.
Thinking either a 3mmx0.5 tap and screw or 6-32 tap and screw. Currently have an end plate on but it’s 0.5 oz and I would prefer more buffer thread in the lower.

Anyone done this on the carbon and know the size?

I did not order the tap, I just threaded the screw directly in, it was loose enough, I covered the back with superglue. No issues with 850+ rounds.

My other rifle has a smoke composite end plate. It weighs nearly nothing.