Ma Deuce question
I was at the range with friends today for a long shooting session. Among the guns I took was my .50 Ma Deuce semi-auto. It is a TNW gun. It would fire, eject and chamber a fresh round but would not cock the gun for the next shot. Each time I got a mushy trigger. Any ideas???
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I'd be asking the manufacturer for guidance. Has it ever functioned correctly? Maybe a burr.
http://www.globalsecurity.org/military/library/policy/army/fm/23-65/ch42.htm#p10 -
Its been years, but I know the M-2 .50 requires headspace & timing checks. I don't know it the civilian semi-auto ones do though. If the barrel still unscrews it probably does require headspace go/no go gages & timing shim.
You can find instructions for setting Headspace & Timing at:
http://www.pica.army.mil/picatinnypublic/m2_headspacetimin/m2-poster.pdf0 -
Line item h. in the 4-1 chart charliemeyer linked to are the most likely suspects.
Also check the accelerator if it has one. Unusual or excessive wear as well as burs can slow the action enough that it won't cock even though it still recoils far enough to feed.
http://www.gunpartscorp.com/Manufacturers/Browning-33164/MachineGuns-35559/M250CalMachineGun-37184.htm
I'm not finding a parts diagram, but the accelerator is the fourth and fifth image down to indicate what part you're looking for.0 -
quote:Originally posted by charliemeyer007
I'd be asking the manufacturer for guidance. Has it ever functioned correctly? Maybe a burr.
I will be contacting them on Monday, but thought someone here might have a solution.
It has always worked correctly up till now. I thought it might be ammo related, so I tried one of the other 50's there yesterday and my ammo worked perfectly in it.0 -
quote:Originally posted by 1sgret
Its been years, but I know the M-2 .50 requires headspace & timing checks. I don't know it the civilian semi-auto ones do though. If the barrel still unscrews it probably does require headspace go/no go gages & timing shim.
I have a headspace gauge hanging on my gun and use it to set up as I transport it with the barrel removed. The headspace is not the problem.0 -
Sounds like the disconnector may not be working or it is not (already mentioned)
The bolt not cocking the rifle.
Test the disconnector by snapping on an empty chamber and hold trigger to
Rear while opening bolt by hand. Release trigger and try.
If it works empty there is some thing holding bolt back. Back to head space
or some thing foreign inside0 -
gnprts said:
Sounds like the disconnector may not be working or it is not (already mentioned)
The bolt not cocking the rifle.
Test the disconnector by snapping on an empty chamber and hold trigger to
Rear while opening bolt by hand. Release trigger and try.
If it works empty there is some thing holding bolt back. Back to head space
or some thing foreign inside
Joe,
I believe Wayne has hit the nail on the head. I had to think about this one for awhile, but, it all came back to me. Try Wayne's test, it should give you the answer.
BTW, I have a head space and timing tool hanging on my reloading bench.
W.D.0 -
WD.... I tried it and the sear is not resetting. Pulled the trigger, held it back, operated bolt, then released trigger.... only mushy, sear was not reset.
I'll tear down the bolt and check the sear, firing pin, sear spring etc.
The .50 I had in Nam never went down, worked great all the time. We had armorers to take care of detail stripping issues.
Thanks0 -
Emailed TNW last night, they called me today and I described problem. Larry talked me thru removing and inspecting the trigger assy. There is a little tab on the front of the trigger that engages the sear. It was gummed up with old grease that had hardened.
Problem solved0 -
TNW are good people.
I bought a second-hand 1919a4 of theirs, and the service folks had me up and running in minutes.0
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