i dont know about all this. i have faithfully carried a para 3 for 2 years tip up back pocket with the blade toward inside my pocket not the seem. tried to switch it so it is against the seam but made it harder to draw and open. never once have i had an issue. not once have they opened on me. i also have carried a little native the same way no issues. i actually find anything that spring closes to be more dangerous to me than any liner/frame lock or compression lock.
In-Possession - Para 3 S35VN, Para 3 G10 M390 Red, Dice XHP, Lil Native S30V comp B, Manix 2 M390 G10 BR, PM 2 M390 DLC BL, PM 2 K390 RG, MKM Voxnaes Isonzo N690, Benchmade 555HGBlu, Ontario Rat 2 Gr G10
On-Deck - Manix 2 DLC ?, Brouwer, Lil Native compression 20CV/M390
Loved Steels - M390/20CV, S35VN, BD1N, XHP, S30V, N690, K390