I have found the SNG to have a pretty stiff lock to disengage, and honestly i think i like that, i hate it when a liner/frame lock is too easy to move to the left, i like a little bit of "stick" to it, true, when my SNGs were brand new and not broken in, they were a little too hard to unlock, and i had a nice blister on my thumb to prove it, but now theyre all perfect, stiff, but not impossible. Stiffer than my Sebenza, which is already on the stiff side, but still doable. I like my SNGs more every day. Just wish i could find a new AR for sale.