Edo Posted May 19, 2011 Report Share Posted May 19, 2011 Greetings All! I just read the post about there being a special gas piston for the M-2. Can anyone out there tell me about this and where one would get one if it is true? I have a Plainfield paratrooper which had a number of M-2 parts in it when it arrived. Also, just heard about the original early models (U.S. gov. Win. or Inland) having a forged rod instead of the later stamped version which is said to flex too much and causes malfunctions. All help welcome.. Thanks from Edo Link to comment Share on other sites More sharing options...
emmagee1917 Posted May 19, 2011 Report Share Posted May 19, 2011 Well , that's a new one . No , there is no difference in the piston / nut between semi and full autos. Now , there was a very early piston / nut that was superceeded by the curent piston / nut , but that happened so early in the production that the chance of you ever running into one except in an early carbine is extremely remote . The difference is that the front of the piston rod has a larger , extra taper that the old did not have , and the nut has a larger , double cut relieved area to clear it. Chris Link to comment Share on other sites More sharing options...
n64atlas Posted June 20, 2011 Report Share Posted June 20, 2011 Well , that's a new one . No , there is no difference in the piston / nut between semi and full autos. Now , there was a very early piston / nut that was superceeded by the curent piston / nut , but that happened so early in the production that the chance of you ever running into one except in an early carbine is extremely remote . The difference is that the front of the piston rod has a larger , extra taper that the old did not have , and the nut has a larger , double cut relieved area to clear it. Chris The pistons remained the same, the nut was recesed . Can't remember why though Link to comment Share on other sites More sharing options...
emmagee1917 Posted June 21, 2011 Report Share Posted June 21, 2011 I disagree with you , sir. See figure 274 on page 287 of War Baby. On page 287 he gives the stock numbers of old style and new style nuts and the old style and new style pistons. Ergo , a change was made to both. I cannot lay my hands on the why just now , but IIRC , it was a reliability issue due to rare sticky pistons . Chris Link to comment Share on other sites More sharing options...
timkel Posted June 21, 2011 Report Share Posted June 21, 2011 The later improved gas piston and nut allowed the piston more travel. This was thought to increase reliability. I think I have a set of the early piston and nut somewhere. Link to comment Share on other sites More sharing options...
n64atlas Posted June 22, 2011 Report Share Posted June 22, 2011 I went thru my parts, I have an early piston and the later on. They put a bevel on it to match the nut. The old will go in the nut but is a bit sticky when pushed back out. Don't have a stroke, you tend to forget things. I hope I was dressed when I left the house today. Howard, recent blood clot stroke victum. Link to comment Share on other sites More sharing options...
timkel Posted June 22, 2011 Report Share Posted June 22, 2011 (edited) This is a close-up of an early M-1 carbine piston nut. The face is squared off. The later nut is beveled to allow the piston more travel. http://img.photobucket.com/albums/v323/timkel24102410/stuff/M1carb_early_piston_nut001.jpg Edited June 22, 2011 by timkel Link to comment Share on other sites More sharing options...
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