hi cap 5.1 slide stuck
 

I have a TM hi cap 5.1 and I was playing at flagraiders on sun. I was useing it and it work perfectly but when I tryed to use it the last time once I was empty it lock back so I unlock it but it didn't go all the way back forward it got stuck around 3mm away from closer. The spec are it is stock I was useing .20 bb and running on propane.

You blew your o-ring off. You can disassemble the slide and put it back in place, but the problem is going to happen again and is only going to get worse. I'd recommend getting a replacement piston head.

the upgraded replacement part you want is made by tanio koba.
PM ILLusion, he might have a few left.

there's also piston heads made by Shooter's Design and PDI. I'll see if I can bring some of those in as well, although nobody has asked for them yet.