W a couple minor adjustments to the frame, all sorts of aftermarket systems work. The rear rails are no different than aftermarket rails. It’s the trigger housing pin that determines the height of the rails. So…… if you look at all these bills, you’ll see that the trigger systems sit just a little high than they should. That’s because their shit is supposedly designed that way. What are you Gotta do is drop that pin just a hair and you’re in there. You do, however have to be brave enough to alter the frame or cut the existing rails so they set a little lower. Compare the Geiszler rails to aftermarket rails like they’re width and length and you will see that aftermarket rails are a little shorter and fatter. No aftermarket rails depend on a tail fin. So if you cut the tail fin off, you’re left with a standard rail that you can lower if you lower the pin, measure the distance between the frame, and the back end of the injector, you’ll see that there’s a little tiny gap and people are always talking about shimming that situation, what you Gotta do is lower the pin. If you do, you’ll have rails that sit flush. You only get one shot at this. So I think it through, only use Bradpoint bits!!! you’re only going to lower it like a millimeter. Also, if you look at the inside of a P80 frame and compare it to the Geiszler, you can see that with a couple cuts here and there yeah you can have just as much freedom with a Geiszler as you would a P80. feel free to hit me up I can go in to much further depth. I’m trying to find someone who’s willing to talk about this because I can prove my shit. I have a rook tactical rail system that fits, I just had to make a little cut here and there. Nothing detrimental, nothing major, totally achievable. you could cut a Geiszler front rail system in half and use the front end as a split rail system, and put an OEM Glock locking block in there and it would be cherry. Is there anyone thinking outside the box like this?