Assembled from leftover and "garage sale" parts my "FrankenGlock" now runs... almost. I tried a standard G35 and G24 spring, no joy. The slide doesn't move hardly at all. I then slapped an old worn out g23 17# spring on my super duper custom SS extended guide rod. (Yes, it really is a 1/4" bolt with the head turned down) More FTE(ject). Working 1 loop at a time I clipped 3 coils. Better, but still not fully ejecting. And now when it's pointed up the slide comes back just a touch when the trigger is pulled. The firing pin spring is overcoming the recoil spring. So, I figure I need to do 2 things. Figure out the spring set up and lighten the slide. Are the full size springs much longer than the compact springs? Enough to make a difference in a light spring weight (15 or 17# probably)? And, is there anything to watch out for when drilling a slide? I'd start with a few holes, random size and pattern, in the area in front of the carver mount. tia for any help.