The old H&R M158 or "Topper" shotgun action is an inexpensive utility weapon and relies on a rebounding safety. That is, the hammer will not stay in the "down" or fired position when at rest or after pulling the trigger.
I do not know of any device that allows you to safely carry the piece "cocked and locked".
Why would you want to carry the piece around with the hammer cocked? I would think that a fast thumbcock is all anyone needs for hunting purposes.
Questor, I have yet to see a safety on any H&R Topper that would allow you to carry a loaded shotgun or rifle by either H&R or NEF. It would go against all safety rules anyway. Some carry with the breech open and load a shell in just before shooting.
The breech brake release is right there on the wrist of the Topper by the hammer.
If I were you I would go to a gun show or sporting goods store that carries H&R or NEF rifles so you can handle one for yourself.
A forum community dedicated to the great outdoors and hunting enthusiasts. Come join the discussion about hunting, fishing, survival, archery gunsmithing, optics, reviews, accessories, classifieds, and more!