Some of the OEM manufacturers make them.
But do you need them??? As much as I love them on target and err...."special" rifles, I wouldn't have them on a hunting rifle on a bet.
History fails to record a single precedent in which nations subject to moral decay have not passed into political and economic decline. There has been either a spiritual awakening to overcome the moral lapse, or a progressive deterioration leading to ultimate national disaster.
If you think a strong military is expensive, think about what a weak one would cost