I just installed the noveske sts 60 degree magpul ambi safety. It fits and works perfectly. I have the same on my AR.
One of my reasons for going with the S&W M&P 15-22 was its ability to accept real AR add-ons and upgrades.
The lack of the "click" when using a real safety is because of the pin used... Not the safety. If you use an AR pin and spring, you will have your "click". The M&P spring is weak and the pin is polymer.
When I first installed the levers, they were tight to manipulate. But that was simply because they were new and have to be worn in a bit. They function 100% now. I guess you could pre-wear them with a dremel or some sand paper if you wanted to speed up the process. I think that the S&W upper is a fraction (just a fraction) wider than a real AR.
The ambi safety levers were slightly the same way on my actual AR... But not as bad.
But like I said... 100% now.
Question... Since the default safety can be flipped to be on either side... Is it just having a lever on both sides?
Idea... buy another OEM safety... Shave off the lever... (Leaving a small notch protruding) Drill a small countersunk pilot hole through the new safety lever and into the existing safety. Cut a notch into the safety (female end) that matches the one you cut in the lever (male end) and just screw it on with a screw that would sit flush in the countersunk hole you drilled. Booya... Ambi safety.
Just an idea rather than remanufacture an entirely new lever.
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