Keltec Sub2000 Recoil Buffer

printed on an Ender 3 v2. Works perfectly for me using regular ammo. Printed in Gizmo Dorks TPU. 30-50% infill, whatever settings you use for TPU should work as well, as it is just a donut really. pops right around the recoil spring and does not cause any issues, after a few hundred rounds with it in.