Bad Bad advice, if your USC upper is cut for the auto sear, you have just made an MG, welcome to club FED. JeffThere's sticky at the top of this forum that has a lot of good info:
Which has a good step by step guide on what needs to be done. He adds a sear pin block and relocates the sear pin, but from what I've read recently, this doesn't need to be done if your USC upper has to been cut for the sear trip lever.
For some reason, Top Notch doesn't show a copy of the letter he received from the ATF. I know Tactical Excellence worked with their local ATF when developing the conversion, well before anyone else did. I don't know that they told him specifically that it was necessary but Jeff goes to some length to do what he does with the sear pocket- arguably there's good reason for doing so.He adds a sear pin block and relocates the sear pin, but from what I've read recently, this doesn't need to be done if your USC upper has NOT been cut for the sear trip lever.
I wouldn't think you'd have an issue with how Ed fills that cavity. If there really is a letter in existence that clearly says the cavity does not have to be filled, then it's a moot point. The only difference between the TE and HDPS approach is that TE enlarges and offsets the pin hole. I don't really see a big difference between an aluminum block or a cast-in-place piece of polymer. The ATF bases alot of their opinions (and prosecutions) on the concept of "reasonable" Is it reasonable that an average individual could reverse the TE sear block? The HDPS one? That depends on whose interpretation of reasonable we're talking about.Any thoughts on compliance issues/concerns about the HDPS conversion? I'm pretty sure it is fine, but would appreciate any contrary thoughts.