![]() Some additional testing found the highest hardness readings at 0.005 " deep at 46 HRC, front and rear.Īs an engineer, I would agree that the Federal Ordnance receiver is junk and I wouldn't use it. Material - The elemental composition was found consistent with AISI 8620 alloy steel.Īverage core hardness - 46 HRC, front and rearĪverage surface hardness - 53 HRC rear, 55 HRC frontĪverage core hardness - 23 HRC, front and rearĪverage surface hardness - 40 HRC rear, 39 HRC frontĬase depth - Since the surface was less than 50 HRC, no case depth measurements were taken. When I get a chance, I'll take photos of the cut parts and post them on my web site. SEI will be shipping the pieces parts back to me. Several hardness readings were taken for each data point to determine an average in the back and in the front of the receiver. Both receivers were cut into thirds, just behind the receiver bolt lugs and just behind the rear sight pocket. very graciously provided me with a copy of the lab report for each receiver. I put 100 to 200 rounds through the Armscorp rifle but I purchased the Federal Ordnance receiver from the previous owner who had bought the rifle used.įor reference, here are the USGI M14 receiver drawing hardness and case depth requirements after July 1961: 61 to 71 HRD (47 to 60 HRC) for surface hardness, 28 to 42 HRC for core hardness and case depth ranging from 0.012 " to 0.018 ". Both receivers had been assembled into rifles and used but how much, I don't know. Both receivers were later production units for each manufacturer, 20-92, respectively. I donated the two receivers for destructive testing, Armscorp USA serial number 17371 and Federal Ordnance serial number 60223. ![]() (Tempe, AZ) had two commercial M14 receivers cut apart last month and tested for the following: a) elemental composition b) surface hardness c) core hardness and d) case depth. ![]()
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