So I finally finished converting and SBS'ing my M4 Field Stock to an M4 Entry.
Since the M4 Entry comes with a fixed choke 14" barrel I sourced a factory Benelli 14" barrel that was threaded for chokes/suppressors.
Then I was lucky enough to find someone willing to sell me their factory Benelli M4 T PRO OEM handguard rail from their M4 PRO.
The gentleman who sold me the barrel later reached out with an offering of the oversized bolt release and charging handle and I was on my way.
Last part was the 5-position tube and european stock...spent the afternoon with my pops, a blow torch, a big vice, and a huge wrench and we got er' done.
Took me about 3 years and probly spent double but I enjoyed the journey and am finally happy to have it done.