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4/18/2011 1:21:38 PM EDT
What do I need to look for in an upper that would have put on a hydramatic gun from the factory?
4/18/2011 1:48:29 PM EDT
[#1]
Retro black rifle forum has a nice page on other manufacturers M-16's including hydromatics.  Basically look for casting flash on the upper.  These complete uppers do come up from time to time on the EE.  Finding parts has always been a little hard but most the hydromatic small parts and furniture have a number or letter on them.  There are also some good threads here on AR15.com if you can search archives.
4/19/2011 4:46:46 AM EDT
[#2]
So according to that retro black rifle place, im looking for a blank upper proof wise.  It says H&R uppers have the forging flash, so same with Hydramatic uppers?  What bout barrel marking or anything?
4/19/2011 10:44:28 AM EDT
[#3]
Hydramatic uppers apparently don't have the pronounced forging flash.
You'll want a CMPC barrel.
4/19/2011 6:28:43 PM EDT
[#4]
Quoted:
Hydramatic uppers apparently don't have the pronounced forging flash.
You'll want a CMPC barrel.


GM have the flash, just not as much a H&R?
4/20/2011 2:22:19 AM EDT
[#5]
Retro black rifle forum has a nice page on other manufacturers M-16's including hydromatics. Basically look for casting flash on the upper. These complete uppers do come up from time to time on the EE. Finding parts has always been a little hard but most the hydromatic small parts and furniture have a number or letter on them. There are also some good threads here on AR15.com if you can search archives.

Apologies.  Was thinking about H&R uppers and small parts I'm getting feeble.  We don't see a lot of hydromatic clones here.  Will have to increase knowledge base.
Thanks for correction Tex.  Probably be a nice retro build OP complete with engraved lower.
4/20/2011 4:40:58 AM EDT
[#6]
I already have the registered lower, just want the factory upper to go with it. Lol

Have plenty of A1 uppers to goof off with, but I'm a stickler for the correct one also.
4/20/2011 6:18:42 AM EDT
[#7]
I think you are looking for this - no forging code, no Colt proofs, no flash, rebated front lug; but I could be wrong.





4/20/2011 6:20:39 AM EDT
[#8]
Do not Hydramatic barrels have weird forge codes on their front sight bases?
4/20/2011 11:04:28 AM EDT
[#9]
On pages 18 and 19 of the Real Deal picture thread there are pictures of real Hydra-Matic rifles.  It might be worth asking the guys that posted those pictures for more information.  (look for forge codes and proof marks in case uppers were swapped out)
4/21/2011 2:30:12 PM EDT
[#10]
Quoted:
(Snip) You'll want a CMPC barrel.


Um, No. GM barrels are marked with the MP between the FSB and a C near the muzzle just like Colt and H&R barrels of the period.


Quoted:
Do not Hydramatic barrels have weird forge codes on their front sight bases?

Mostly yes, usually a number code on the right side and a letter code on the left that may be upside down. Example 18 (right side), upside down F (left side).

Wpns Man
4/22/2011 5:42:22 AM EDT
[#11]
So

-barrel marked MP and C
-Front sight base marked with wierd coding
-No farge flash on the upper rceiver and no codes
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