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9/22/2017 12:11:25 AM
Posted: 8/10/2005 7:51:53 PM EDT
[Last Edit: 8/10/2005 7:52:40 PM EDT by G35]
I have several Bushmaster upper receivers. But, I recently got several DPMS stripped A1 upper receivers.

I noticed that when I thump (hit) the DPMS uppers with my finger, it will have a "ting" or "ping" sound to it, and I can feel the vibration travel thru the piece. It is very similar to a tuning-fork type of sound and vibration.

When I do the same thing to my Bushmaster uppers, they produce a dull, dampened "thud".

Both Bushmaster and DPMS claim that the uppers are Forged from 7075 aluminum that has been T6 heat treated.

The DPMS upper will ping (act like a tuning fork) the most if thumped along the carry handle railway. I have several DPMS A1 uppers that I just purchased from a very reliable vendor. It does Not seem to matter if the upper is stripped or completed assembled and attached to a lower (in condition 3). The "ping" sounds the same with the stripped and assembled DPMS upper.

WHY DOES THE DPMS ACT LIKE A TUNING FORK ???
Link Posted: 8/11/2005 10:08:59 AM EDT
[Last Edit: 8/11/2005 10:09:53 AM EDT by Alpha15]
The recievers have less metal [thinner walls ,handle area ect.] and they are made from forgings the same place as the A2and A3 upper receivers come from. I have several old and new A1 and A1E3 receivers that do the same thing and these come from 3 different forging company's.
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