Bolt hold open

[marknct]

Kinda, sorta the same, only different. Didn't think the other pics were ever going to be found so this came about.
3/4*.06 woodruff cutter going about .1 deep in ratchet plate. Tilt rifle with barrel side up a bit so you don't leave swirls from the back of cutter. Mat'l is 3/8 sq stk. I'll re-do the sketch so it's readable and post it later. The add-on has to have some tilt to it for clearance over the raised stop.

[marknct]

latched pic. You could just use an angle if the ratchet plate wasn't welded on.

[42rocker]

Very interesting way to do a bolt hold open. Thanks for the pics and info share.

Later 42rocker

[marknct]

Sorry for the poor quality, if it didn't happen now it would probably get lost. Overall length of 1.28" might need adjustment for your application. Remember you need enough travel space for it to unlatch. Tack it and check that it clears for normal operation, bend A/R. Nice of them to provide a spring.