1. It doesn't make sense co combine the Nine Ball Short Stroke recoil spring with the Airsoft Surgeon shock buffers. You will get feeding issues because the slide won't stroke back far enough (assuming you are using three shock buffers - you would essentially be short stroking a short-stroked setup. :P)
2. You will need some form of a compensated setup or a 6" outer barrel in order to run a PDI 6" inner barrel
3. You need a metal outer barrel to match the metal slide, or else you will destroy the plastic barrel. You are always best to match brands. Airsoft Surgeon, ILLusion Kinetics, they come from the same factory. With ILLusion Kinetics, you can get other options, such as more realistic chamber markings, options for gold plating, etc.
4. The Nine Ball Mag Bumper has fitment issues with many flared magwells. I would recommend something else. I personally prefer the metal bumpers.
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