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9/22/2017 12:11:25 AM
Posted: 9/30/2005 9:12:46 AM EDT
Are Oly upper recievers and ejectors the same for both the 9mm and .45 uppers?
Link Posted: 9/30/2005 9:30:50 PM EDT
yep!
Link Posted: 10/1/2005 11:33:28 AM EDT
Hahn Precision has a drawing for the location of those holes in the LIBRARY section if you wish to go to a different upper reciever.

FYI..........RRA makes a slab sided 9mm flattop upper with NO forward assist or deflector that works well with the Oly conversions........and at much better quality than Oly.
Link Posted: 10/3/2005 10:17:09 AM EDT
really who does rock get their forging from
Link Posted: 10/3/2005 10:26:54 AM EDT
Same forging as everyone else.....they just delete some machine operations and machine/blend off the excess. They DO NOT have the gas tube hole though. With the Oly uppers you don't need a case deflector.

FYI.....even though Oly doesn't recommend using a heavy buffer, make sure you use one!
Link Posted: 10/3/2005 10:36:11 AM EDT
[Last Edit: 10/3/2005 10:38:22 AM EDT by wildearp]

Originally Posted By Dehammer:
Same forging as everyone else.....they just delete some machine operations and machine/blend off the excess. They DO NOT have the gas tube hole though. With the Oly uppers you don't need a case deflector.

FYI.....even though Oly doesn't recommend using a heavy buffer, make sure you use one!



Both of my factory Olys have gas tube holes, no gas tube(you must mean RRA). Every feature is the same on the upper, other than a hole on each side for the ejector.

I use a standard buffer for 9 and .45. Thousands of rounds, no issues whatsoever.
Link Posted: 10/3/2005 10:52:03 AM EDT

Originally Posted By wildearp:
I use a standard buffer for 9 and .45. Thousands of rounds, no issues whatsoever.



The math of mass and velocity say a heavier buffer is better than a light one. You may want to try a heavier one to feel the difference, especially in the 45.
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