Most of the ones in NZ are... by flat I mean they are straight... not necessary flat ie they might be straight but angled downwards.
I think the main issue it is trying to address is the lateral not longitudinal profile anyway?? That was my understanding of the spirit it was written in.
"Astrid" - Steyr LG110FT / Falcon T35S
"The Bangstick" - Falcon FN19 .25 FAC / BSA 8-32
Too many tinker projects, not enough working rifles.