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Posted: 10/23/2010 3:50:48 PM EDT
I know, I know... yes I've looked at all the docs, but I still don't know exactly what I have here. The one on the left is an early one with no drain hole. Neither have any discernible markings that I can see. 
 
 
TIA ! |
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from the guide at the top of the page;
The cast front sight base was replaced by a forged part for obvious reasons. The first version of the forged front sight base was machined smooth to remove forging flash and used on M16 and XM16E1 rifles, and on the M16A1 for a time. Production started as early as 1964, and was used as late as 1969 and serial number 1,750,XXX. A bottom drain hole for the front sight post assy was added in 1967: yours are forged |
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Quoted:
hk has a good visual point.. the bottom of the rear leg on a forged fsb is semi-circular and higher whereas a cast fsb is flat and a bit lower compared to the top of the handguard cap forged http://img.photobucket.com/albums/0603/Ekie12091941/variation%20guide/MPC11.jpg cast http://img.photobucket.com/albums/0603/Ekie12091941/variation%20guide/fsbarmalite.jpg Good point crackedcornish. I never noticed the flat vs rounded on the FSB's, just that they were either flush with the HG cap or higher. |
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