Interesting thread; I'm getting my arms around it. Having the option to adapt an AR style upper to the NFA 'M' lower is potentially a game changer. CB, delayed blowback capability...equally interesting. Just an opinion from a one time Fleming HK sear owner - I expect it’s only a matter of time (and continued innovation/persistence) that this piece of kit or version thereof will eventually go into production.
In rereading this thread it reminded me of where the idea originated. I to am a one time owner of a Fleming HK sear. I have an extensive collection of host guns, most of which are configurations that HK never made. I had been thinking about how to adapt the AK47 mechanism to the roller locked receiver. I had just transferred a M10 from “Vegas SMG”. While pulling out an AK and a PTR 91 receiver, I noticed that the AK receiver and the M10 upper had a similar size. It got me instead thinking about the AK mechanism adapted to the M10. I tried and failed. I just don’t have the skills. I tried multiple gun smiths. No one wanted to take on the project.
We moved back from Las Vegas to Southern New Hampshire. There is a local machine shop that had made the parts for my AR water cooled 20” upper. He said that it was too complicated for him, but he knew a retired engineer that did work on the side.
In talking with him, I told him that I would like to adapt the AK, HK 9 series, and the AR mechanisms to the Mac style series of firearms. In doing research of the mechanisms, the AR lent itself to being 3D printed. So we worked on building a proof of concept using the AR mechanism. I spent almost $5,000 on the engineering, manufacturing and submission of that proof of concept.
As the cost of transferable machine guns rises, certainly this adaptation will become more and more cost effective. Super Safeties and forced reset triggers might slow the growth of transferable machine guns, but I don’t think that they will replace transferables. Just thought I’d share that.
Scott
