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So a system that’s an order of magnitude more expensive and overall less effective? I bet the US Army is already working on it.
A counter to this would be send in endless decoys until the gun either runs out of ammo, jams or just fails.
A landmine is a hidden device that no one knows the location of … you can guess but that landmine could be anywhere so the enemy has to give it lots of area to be cautious of in order to avoid the danger.
A sentry gun is obvious and you can immediately determine the area it effects so you know where and how to avoid it.
A sentry gun is also a target, you know exactly where it is to try to take it out. Conversely, you don’t know where landmines are so you don’t know how to take them out and if you do want to find them, it will take you a lot of time and effort.
Too credible
We’ll need pop-up sentry guns
A more deadly version of … WHACK-A-MOE!
To add to this, land mines can take out heavily armored vehicles. A sentry gun would waste all of its ammo on an armored vehicle, then you could just drive up and steal it. Or you could put a cardboard cutout on an RC car and do the same
The decline of efficacy of AP .50 cal against armored targets was a disaster for the human race
bring back the original intent of the M2 - hosing down German tanks with AP rounds
