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Posted: 2/2/2017 10:54:40 PM EDT
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I know the general theory is that GM buffers have the dimple, but this one came in a large lot of NOS GM parts that I traded Live4nov for. He acquired them all at the same time from the same source. The anodizing is visually different looking that the Colt buffers I've seen. As is the little grind mark in the center.
What says the hive? 
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Patent for the buffer in 1966 shows in fig. 6 roll pin being used to retain the bumper.
If desired and as shown in Fig. 6 a plug 72a and bumper 76a may be integrally molded from polyurethane and assembled in the buffer as illustrated. Due to the limited resiliency of polyurethane, the body of the plug 72a may be slightly larger in relaxed condition, than the bore of buffer 66a to seal the same against leakage. The bumper 76a held into place with a roll pin is what was adopted and went into service Jan 1967 to replace the Edgewater. Unless I'm wrong. buffer patent 
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Thanks for sharing the drawing. None of the Colt M-16A1's I have access to have a roll pin in the bumper or any I've purchased in de-mill kits or my personal clones or SP-1's. I did inquire with member Coldblue years ago asking same question as I knew he worked on or with those doing the A-2 project and this was his response to roll pin question.
"From Coldblue. The pin was added to the M16A2 technical data package as approved for the USMC in 1983. That was shown to keep the buffer assembly together in extreme cold weather. The Army probably was slow (or maybe ignored the change) to change form their M16A1 tech data that supported their vast inventory. And probably vendors were given wavers not to include the pin because quite frankly, the logistic side of the Army was not totally on-board, especially with A2 parts that could retrofit to older A1's. Dave" The M-16A2's I have access to do have roll pins on the bumper some with dimples and some without. I'll try and pull a few and take some pics. |
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Quoted:
Should have a wine colored pad for GM. I have a  small pile that are pulled and show what I'm talking about. Ill take pics of after work, but here is one that I used last night to block the SN for a pic. This was the darkest one Ive seen and I pulled it out for my use. You can see though how it went from an amber orange color to almost black. Attached File |
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Quoted:
Thanks for sharing the drawing. None of the Colt M-16A1's I have access to have a roll pin in the bumper or any I've purchased in de-mill kits or my personal clones or SP-1's. I did inquire with member Coldblue years ago asking same question as I knew he worked on or with those doing the A-2 project and this was his response to roll pin question. "From Coldblue. The pin was added to the M16A2 technical data package as approved for the USMC in 1983. That was shown to keep the buffer assembly together in extreme cold weather. The Army probably was slow (or maybe ignored the change) to change form their M16A1 tech data that supported their vast inventory. And probably vendors were given wavers not to include the pin because quite frankly, the logistic side of the Army was not totally on-board, especially with A2 parts that could retrofit to older A1's. Dave" The M-16A2's I have access to do have roll pins on the bumper some with dimples and some without. I'll try and pull a few and take some pics. That's very interesting. I've sold 30 to 40 NOS NIW M16A1 buffer assy and more out of the wrap and never encountered one that didn't have a roll pin. What the heck! 
 
 
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So I wonder who made it then? We know there are two varieties of GM uppers out there (one with several forging flaws and a rebated lug, and one without either), possible other parts had variations.
If it's not GM, then whose is it? It still doesn't look Colt to me. The pattern in the anodizing is odd looking. |
Colt M-16A2 80's and 90's production. Wine bumper and roll pin. John 90's production looked more like yours IMO. I don't have access to any authentic GM or H&R's but should be a couple floating around here. I can't say for sure these are 100% original on govt property M-16's a minimum of 20 yrs old but my best guess is they are.
Colt M-16A1 late 60's and a 70's production. No roll pin and blackish in color bumper visible. As stated the bumpers do color changes over time whether from chemicals used to clean or age I don't know. Scratched 70's CH code bumper and it''s wine underneath the black, can kinda see in crap pic on right. 
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