Hmmm. I thought the M4E1 was pretty proprietary - it ain't mil-spec at any rate. I got this info from TOS so take it with a grain of salt. But I hope it helps.
Supposedly a couple of more vendors that have BAR type handguards are Primary Arms and Radical Firearms. I bought a Primary Arms BAR rail once. It was literally (and you can ask docsherm) the FREAKIN' FUGLIEST handguard in the known universe. No, I take that back It was "To Infinity and Beyond" fugly. When it was created in the bowels of hades, it must have fallen out of the FUGLY tree and hit every fugly branch on the way down. The designer must have been a methhead off the streets of Taipei and born an inbred with the majority of his frontal lobe missing. That said, it will fit your M4E1 and if you want it, I'll sell it to you for - air quotes - "A Great Deal" just so I can stop hating myself and kicking the neighbor's cat around like a soccer ball for even buying such a SUPER FUGLY handguard. But yeah. I'll sell that fugly mutha for some shekels.
If that doesn't tantalize your taste buds and seem like the deal of a lifetime of a sea urchin, and frankly, I do not know why on earth it wouldn't - you can check the rails in the links below. Granted they are not as fugly, I mean unique as my rail, but then again, my rail is
very unique and you can't find them in the whole world. Ever.
If you look at the pics, you'll see that the barrel nut, is that what you called a "jam nut" Like literally jam? Anyway, what I call a barrel nut (ahem and the rest of the world) looks like the same BARREL nut that the M4 Echo 1 uses. If I had to choose one of the below, I'd lean towards the Seekins. They have a pretty solid reputation.
http://vtsupply-com.3dcartstores.com...13_p_2056.html
https://www.ergogrips.net/shop/ergo-...k-rail-system/
https://www.spikestactical.com/colle...kes-bar2-rail/
Just out of curiosity. If you didn't plan on using the Aero Quantum rail, why did you buy the M4E1, since the BAR type rails are not very abundant? Just curious.
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