Hey guys I am a newbie to the forum but a long time reader.
So my newest build is a 10.5 pistol, I have used the adams arms XLP piston kit, I have gone through the list of rails that will work with the system but I am wondering if anybody has experience with any of them that work better/best and hoping maybe somebody in the central florida area has something laying around as it seems most are backordered. Thank in advance and I look forward to being a member

welcome aboard!

Samson MFG rails work but they're heavy.

Samson is approved by AA specifically for fitment.  If you want guaranteed trouble free piston use I would go with the MFG's recommendation.  They also have a list of guaranteed to work FF's on their website!  If all else fails, contact them directly.  I shit you not, I once had a problem with their piston cup interfering with cleaning as it would stop on my Silencerco FH, and after back and forth of sending pics and measurements they gave me instructions on how to mill out some steel to make my custom set up work like it's supposed to during break-down.  After removing the steel, weapon still shoots perfectly, and cleaning is a breeze (not that I really have to)

I have used two Daniel Defense Lite rails on my 10.5 and 7.5 build.  I hacked up a 9.5 fsp Lite rail to put on my 7.5 but both went on without issue.