Trade the unopened box of 5 to someone for 10 not in a box. If no one takes that deal, then use em like they were meant to be. I too am a shooter… nib to me just means untested and may or may not even work…
I don’t think the original designers/owners/investors wanted to go slow. High rpm was the selling feature back then, not the downside it is now. Back then you could just buy another gun, now you can’t…. Different reasons and perspectives for different times
How fast can you get these short ones to run in an m11/9? I have the full length original one and it’s almost too slow sometimes. Can you get it to run 900rpm or so? Put a buffer stack behind it? Stiffer spring?