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Features:
M4 Feedramps
.250 takedown pin holes
Comes assembled, with dust cover and forward assist installed
M4E1 Specific Details:
Handguard mounting platform is forged into the receiver
These uppers are not piston-kit compatible
Will support barrels with a diameter up to 1"
Includes:
M4E1 Enhanced Assembled Upper Receiver
Port Door and Forward Assist installed