It looks closed for the photos you've showed.
Generally, combat pistols like this would use a closed spring guide as well as a standard spring guide, to prevent entry of dust at the spring plug.
Quote:
Originally Posted by Slono
Oh? So GBB with full length guide rods have open spring plugs while standard length guide rods have closed plugs?
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Yes... that's the exact reason why it's opened... so that the full length guide rod can extend through when the slide blows back. It's not just GBB... that's for real pistols as well.