Hey guys I am putting together a Rock USA Gen 3 Glock 19 slide and have all the parts & pieces. I went to install the striker channel liner and it just drops in and if you tilt the slide up it will just fall out, maybe needs a tap but it will fall out! I have installed other liners in Zev slides & others & needed to be tapped in with the appropriate tool. What do you guys think/say? Does it matter that it just drops in & out, with the striker/firing pin & backplate installed can it really go anywhere? Just wondering what you guys think about this. Thanks for any input. For what it's worth I tried multiple channel liners from Glock Store & other brands, all same results.