A telescoping picatinny stock that uses an old Ender 3 lead screw as its struts. Designed with my M7 DeAR22 in mind. Print in orientation described in thumbnail. Tie a string to the base and stock pad to limit maximum travel and prevent accidentally pulling the stock pad off. Uses a spring detent that locks into the threads on the screws. Push paddle down to unlock screws.

BOM:

1x T8x4 lead screw (an Ender's is 365mm long, cut in half it's the perfect length)
4x M4x10/12 socket head cap/button head cap screw
2x M4 threaded insert
2x M5x30 button head cap screws
2x M5 hex nuts
1x Ender 3 bed spring or similarly dimensioned stiff spring (aim for 8mm OD x 22mm length)
JB weld or superglue to secure cut off ends into stock end
String or cable to limit maximum travel

LBRY Tags: ar15; guns; 3d2a; guncad