Hi, not sure if this will help..but some Mame lightgun games reload using button 2. Go into the Mame menu ('tab'), select settings for Input 'this game', and choose a button/key for P1 Button 2 and/or P2 Button 2. Then when you need to reload, just push those buttons (I chose the one on front of the gun grip as it was easy to reach) Hope that works for you.
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