These aftermarket Gen 1\2 hammers and Sears people are selling are a trap.  Whether or not the producers are currently acting as informants for the ATF their sales records will be enough.  Look at the folks who have been visited as a result of the su-press-on Ar-15 drop in auto sear debacle.  Notice how Jim Elmazi STFU in a hurry once he had a talking to.  He may try and cover it up but even now the matter isn't settled, there is extensive documentation of his statements and those members soliciting him for NFA conversion parts.

 

The early generation guns are not NFA but neither are Mars CETMES, G series FALs or RPB open bolt MAC-10s.  But just try and build yourself a swing down lower HK, sear cut FAL or open bolt anything nowdays.  By themselves they will not function fully automatic but they are configurations which lend themselves to conversion and have been deemed by the ATF to no longer legal for additional production.  In much the same way FN has changed the design of the FS2000 and PS90 specifically to adress the issues with the ease of conversion.  The ATF did not specifically adress the issue however the ATF has changed the way they do a lot of things since the days of G series FALs, Mars CETMES and RPB Macs.  The situation with the Su-press-on DIAS are a perfect example of this, sales go for a period before the makers are rounded up, charged and forced to hand over customer lists.  Same thing with the Akins accelerator.  By themselves the su-press-on DIAS will not make an AR-15 automatic, you must have a correctly milled lower for it to fit and bolt carrier, but that doesn't make the DIAS any less of a conversion device.  In much the same way these hammer and sear combinations being sold are the first part of a larger play. It's a sear coupled with a hammer that is timed for a very specific purpose, had the intention been purely safety it could have timed differently.

Continued.....

Some of the players are just naive or greedy, others not so much.  I don't know specifically what lead to a certain well known manufacturor who suddenly withdrew their offering but I have seen the copies of the threads which were retained and the customer lists developed which makes me believe that serious official attention is being paid.  Obviously I'm not posting this in any official capacity but as a person who enjoys guns and has some perspective on the issue different from the groupthink exhibited in many of the forums.  The people buying these things should be a little more concerned and ready to hand these items over immediately on request.  If nobody has noticed the Feds love slam dunk cases like this where they can show someone was making and selling machine gun conversion parts, particularly for something like the "cop killer" 5.7 round.  It makes good headlines and for good career advancement material for the agents in charge.  For the buyers that hand them over its easy enough, for those that make up stories about how it wasn't them or the ever popular boating accident stories its game on to dig deeper as a result of lying to the Feds.

You can think I'm totally off base but I might have a little different insight than most people here, just trying to caution people with similar interest in firearms.  Some of the stuff going on just makes me shake my head as it's blatantly unlawful such as James B**** distributing copyrighted FN manuals.