the portal in and portal out are to prevent reflection back into the barrel and melting the electronics		
				
			
					
	 
	
	
	
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thanks everybody I will make these changes
		 
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nice gun, only problem i have is that you put all the flammable walls together on the test range. easy fix so +1+
		 
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you can put insl between PCLN and PSCN/NSCN and it will still turn on and off thus fixing the melted electronics problem.  replace the void with insl and the photons will reflect right back out the barrel.  nice design however.  :D