No problem.

"Build" the guns as required when you save the new object files?

In select subset, select the parts to be exported or omited from the "builds"?

In the worst case you have to build 4 different guns, that will load as 4 different object files afterwards.

But, in the end, you will only have 4 object files in your props.

Save as :
Complete gun.
Gun with flashlight.
Gun with silencer.
Gun without silencer.
Gun with flashlight and silencer.

You make the 4 gun "builds" and decide what goes in them or not?

In the end, you will have only those new prop/guns/objects to load.

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
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