This thread in Imgur (and there’s a matching discussion on Reddit) shows the whole process of Bubba attempting to alter a modern AR receiver to more closely resemble a Vietnam War early Colt Model 603, often erroneously referred to as an XM16E11. He didn’t go all the way with it, opting not to reprofile the buffer tower and pivot pin areas, both of which were extensively reinforced in later AR lowers. He did wind up with a decent-looking 50-footer:
As you might expect, a Dremel2 was involved.
What could possibly go wrong? Hey, it’ll buff out. And it’s nothing a couple of rattle-cans of Rustoleum grey primer won’t cover.
Well, almost cover:
Lesson learned, by this Bubba:
Use a file next time!
His further lessons learned:
Build retro rifles.
One of his reasons for doing this was that an NDS lower (which comes with all the profiling correct) was too much money. But on the positive side, he’s done non-irreversible damage to a cheap, generic AR lower, and he’s learned a lot. And if he’s like most Retro AR enthusiasts, every time he looks at that rifle it’s going to bug him until he gets around to improving it some more.
So maybe it’s possible for Bubba to educate himself clean out of Bubbahood. He’s learned, at least, that it’s easier to feel what you’re doing with a file than a Dremel, and that an ordinary Joe can take a piece of aluminum and bend it to his will.
- The label XM16E1 was used prior to the M16A1 type classification being approved, and was not related in any way to the change from a partial fence to a full fence lower receiver, which actually happened almost two years earlier, so you do see the XM16E1 roll mark on full-fence lowers.
- DREMEL: Device Removes Excessive Metal Electrically, Lummox.