M-lok Chamber Flag Holder for 223

Update 2025-04-08 New version 2 with improved design:

• added studs on the bottom to fixate to m-lok slot and to improve fastening
• thicker sidewalls to make it flex a little bit less, snugger and tighter fit for the chamber flag
• entry hole for flag widened to make it easier to insert the flag

Can't keep track of my chamber flag when shooting. Either I put in I a pocket, or on the ground. This one time, couldn't fint it, turned out my mate held on to it. No way, I wan't it within good reach, on the gun.

So I designed this m-lok compatible holder for my chamber flag (223 size) to keep it where I want it:

• Within easy reach for my trigger hand, quick out of the chamber, into the holder, and quick to get it back in there again.
• Sleek and invisible design.

So this is what I came up with. Works nicely for me. Hope it'll do the same for you. Let me know in the makes / comments.

Printing instructions:

• Print it standing up
• No supports needed
• Use brim if needed for bed adhesion. Due to the shape not being closed, inner brim doesn't work.
• I've printed it in PETG and the “Optimal” setting in Prusa (0.16mm layer height). End result is really really nice.