The problem was that no one in Congress had bothered to define what indecent speech was, leaving it up to the law enforcement and bureaucratic officers. Adding a bit of a spin to things, Clinton, upon signing the bill, said he would instruct the Justice Department not to enforce this portion of the law. In other words, we now have laws that the government can decide whether or not to enforce according to whether they feel like it or not. The next question is just what might become obscene or indecent tomorrow. Usually this is discovered before the pin drops out or the gun malfunctions, but it is disconcerting and a pain to have to shove the pins back in after a bit of shooting.
Cost is under ten bucks making it a quick fix.
There's another way to fix the problem. It's a little work but cheaper and a bit more elegant. I especially like the FN barrels the company offers. And these barrels will head space properly with a standard bolt and do NOT need to be reamed out for head spacing - an important consideration if you're building a gun and don't have a .223 finishing reamer handy. All of these companies produce quality guns and parts.