My featherweight AR build is coming together really well. As it stands right now my complete gun with M16 BCG without optics is coming in around 4 lb 10.5 oz (on an analog scale--accurate digital scale on order).

I can drop this another ~1.1 oz with the Manimal FS (on order already)
another 4.7 oz with a BoomFab Titanium BC (on order already)
and another 0.5 oz with an aluminum mag release, aluminum buffer retainer, and titanium-core safety (no decision on these items yet--the first 2 add up to about .25oz and are super cheap, the latter is no more expensive than competitor's short throw safeties--a little cheaper actually).

Meanwhile, I learned that I have a heavy thick aluminum butt plate on the gun weighing about 2.25oz (2.6oz with the steel screws). I want to go to a polymer buttplate (might as well go for a trap door for functionality) and either nylon or aluminum screws (hardware store).

The question is which polymer trapdoor buttplate?
I don't like the lack of checkering on the milsurp: https://www.gunpartscorp.com/ad/555720.htm
DPMS makes an all checkered one but the door part appears to be metal.
RRA makes an all plastic one that people say is really strong plastic but I can't find a picture anywhere.

Does anyone know a good buttplate choice and what the exact weight is?

Mike

PS. This build is part challenge/bragging rights but I also see this gun having a place slung on my back when hiking/backpacking. I have not pinned the FS yet but have tested the upper on my NFA registered SBR lower and found the fluted pencil barrel to be capable of 2 MOA groups (with a 3 MA red dot).

Topic Moved

Wont be a trapdoor, but this might fit the bill.

I ordered a RRA A2-style (all checkered) all polymer.  I'll follow-up with how well it works/how much weight I save.

MIke