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1. My personal preference for a short stroke setup, is the Guarder 150% springs or Airsoft Surgeon 170% springs + Airsoft Surgeon Shock Buffers, or some other form of an active rebound mechanism using a stiff spring, such as the Marui Xtreme Spring setup. I believe AIP sells something similar. I have extra Xtreme rebound kits in stock as well if you wanted to go that route. But for what it's worth, the performance of 3x Airsoft Surgeon Shock Buffers is essentially the same as the Xtreme spring set. I've tried lockout (non compression) methods before, with plastic bushings, metal washers, high coil count springs, etc... but none of them perform as well as an active rebound setup.
2. Plastic slides cycle faster, produce less muzzle flip, and use less gas, thus, maintaining higher gas pressure consistency. BUT... if you are concerned about longevity and durability, you will want to consider a metal slide, especially if you want a bit more kick. With that said, the installation of shock buffers will greatly reduce the chance of the plastic slide breaking. I've seen many plastic slides last for well over 5,000 to 10,000 rounds before they break.
If you want a more powerful and accurate setup, why not go even further with a 7" setup? Or a 14" setup? Especially if nobody around you is doing IPSC, you could build a pretty mean field gun with an extended inner barrel running through a mock silencer.
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