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I need someone to verify a measurement from the rear of the camming window to the center of the forward recuporator bolt hole. I am 99% certain I got my measurements right but it almost seems like the "piston" is to far forward when I close my barrel door (It jams the barrel door and barrel up - I can get it in but I have to wiggle and pry some and I am certain this isn't how it was done in the heat of battle.......... I am wondering if I got my measurements off by about 3 hairs or something here........

Picture shows what measurements I need specifically.

TIA,
TbcSEOD

Hope this helps

Is the front recoup bolt the right way around? I remember reading somewhere here that if the bolt is the wrong way about it lets the plunger stick out a little to far. I cannot get an accurate measurement on my deactivated guns as the camming section is still fitted.

I have the same problem. I need to take apart the recup and clean it really well and the try putting some of that Mi-Comm 25 on, in, around, all surfaces esp where the barrel comes in contact with the beveled front edge of the plunger. Mayt be that will fix things enough. I hate to cut the thing in half!

I guess the true measurement needed would be the amount of overlap between barrel and plunger. I am roughly .125? Its hard to measure in there!

I spoke with 2 guys I know that have up and running MG's and one reported 1inch exactly and the other reported 1.033. One also suggested to re face the bevel - and I did that but have not had time to refit it and check it over again.

If you take the print above and the dim. 2.537 and subtract .156 and 1.281 you come up with 1.100. but i guess that is only the way it looks to me