It has more to do with lack of competition that difficulty in manufacturing. In many other countries, where they're not only legal but sometimesrequired, silencers can be had for $50.
Another factor, I think, it that the approval process is expensive and time consuming so we (the American consumer) expect to get a very high-end product for all the time and money.
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Nobody plans to screw up their lives...
...they just don't plan not to.
-Andy Stanley
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