I just bought a Milwaukee Fastback flip knife . Scales are FRN , liners are stainless . It locks both open and closed . In the closed position , the button has to be pushed , and the blade can be deployed ; to close , the liner lock is released . Pricepoint is about Can. $15.97 . I'm a fan of the lock closed feature , not a big fan of blades "creeping " open in my pocket .
The clip is good quality spring steel wire , and is reversible . Out of the box , there was no side or vertical play . Action was smooth . Steel "feels " like 425 or 440 , the knife came shaving sharp out of the box .
In summation , seems like a good jobsite knife , if it gets swept up with the sawdust , or ends up in a cement mixer; no biggie .
Quality seems comparable to Spyderco Byrd knives .
Chris