5.56/300 BLK Dryfire

5.56 Dryfire magazine insert. Fits 5.56/300 Blackout magazines and prevents bolt lockback during dryfire practice. Allows for mag changes during practice. 

Original design available from various sources with various brand names. Designed my own model for 3D print use.

Tested with GI aluminum mags, all generations of PMag, and Lancer mags. Printed from Orange Overature PETG for high visibility. 

100% infill and 6 wall, top, bottom layers. Print as oriented.