I called Sidearmor today and they just released a mil spec rail for the M4!!
I was looking for just a rail, but I wonder if this is a better option with the shell carrier?
Check this out, this is without attachments:

With attachments:
I was looking for just a rail, but I wonder if this is a better option with the shell carrier?
Check this out, this is without attachments:

With attachments:

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