If I remember right, accuracy wasn't the big stink on j-locks. Slower lock times certianly don't help any, but the lock times, the aesthetics and the fact that it is one more mechanism to fail (and they have a reputation of "locking up" the gun, rendering in unshootable) that made it a loosing idea.

No fear though, head to midway or brownells and you can get a replacement firing pen assembly. A quick 10 minute job and 50-75 bucks I think.