I am flexible on the style. But I want quality.......not some "disposable" airsoft pretend alarms. Any suggestions......??? And I have exactly ZERO interest in building them myself......even if they were free. I want to purchase them. These would be for both foot traffic and vehicle traffic, in serious security conditions, but still society operating largely under rule of law. Goal is to hopefully frighten intruder away and/or alert legal resident of possible security issue. Not interested in hurting anyone or anything......at least not with the perimeter security alarms. For the purpose of this thread........if you feel the uncontrollable need to discuss your firearm inventory, their incredible accuracy, and your sub-second of angle shooting ability, plese start your own thread.