rockstarr
Major Deplorable
there are 2 types of M4E1 uppers,
enhanced=
View attachment 295812
threaded=
View attachment 295813
the enhanced basically has the mount for their gen 2 handguards forged into the upper, you just torque the barrel nut, no shims or timing needed, but it ONLY works with those guards. The other option is to get the gen 2 barrel nut and use shims to time it for any upper, of course you can use any other handguard with the threaded upper. I like the ATLAS series, makes for a sleek rifle, but the gen 2s are large enough to allow clearance for a 1.5" suppressor under the guards. The M4E1 is my go-to for most builds, I really like their handuards too. The middle is a 9" gen 2 on a 9" 300BO, right is a 7" gen 2 on a 7" 9mm, my can is recessed about an inch in those handguards, the left is a 9" ATLAS S-1 with 10.5" 5.56 barrel.
View attachment 295816
So is the thread model the one that is compatible with any handguard including theirs? I believe the Complete upper I ordered Is the “threaded” model M4E1. It comes with their atlas S handguard.