Datac Rennes' 21mm Picatinny Rail for 1858 Pietta

This is their Xtrem model 8" version (basically their 2d Gen of 3d printed rails). I didn't screw the 2.5mm hex key, this is just a test fit but Overall, it feels sturdy on the frame, and by itself, the 3d printed rail feels solid on the hands. No questioning as far as their 3d filament of choice (80% nylon-20% carbon, like aluminum in its rigidity). As far as the 3d print quality itself, I'd say it's 95% perfect because the last 5% shows obvious layer lines on small spots, they don't ruin the overall aesthetics, specially when it's all black, and the accessories attachments is gonna more than make up the small aesthetic shortcomings.

The iron sight itself doesn't support fiber optics but is easily drillable to support actual fiber optics with a steady hand. The iron sight itself is an Express style of iron sight which is common in hunting/sports rifles. I'm personally not interested in it since there is no adjustability with it unless you're willing to file off the 3d print material as you would with the bare metal front sight on the Pietta. It really is meant to be used as an accessory rail attachment.