I would recommend emailing us at techsales@opticsplanet.com to help you further.
The handguard and the upper are anodized.
You can use the BCG from your AR15, however, you will need to purchase a 7.62x39 compatible bolt like the Spikes Tactical 7.62x39 Bolt Assembly, found by using the link below:
https://www.opticsplanet.com/spikes-tactical-7-62x39-bolt-assembly.html
The Radical Firearms AR-15 RF Upper Assembly features 5/8x24 threads and comes with a standard A2 birdcage flash hider.
The only parts needed to complete this Radical Firearms AR-15 RF Upper Assembly 16in 7.62x39 w/ A2 Flash Hider is a BCG and Charging Handle.
Nothing else is needed besides the BCG and Charging Handle for this Radical Firearms AR-15 RF Upper Assembly 16in 7.62x39 w/ A2 Flash Hider.
Yes, the Radical Firearms AR-15 RF Upper Assembly 16in 7.62x39 has a M4 Feed Ramp according to the manufacturer.
Please email us at Techsales@opticsplanet.com for assistance.
The Radical Firearms AR-15 RF Upper Assembly 16in 7.62x39 w/ A2 Flash Hider does not include a BCG or CH. You can find the BCG here: https://www.opticsplanet.com/radical-firearms-rf-7-62x39-m16-bcg-melonite-bolt-carrier-group.html
You can use a couple different charging handles with a specific 7.62x39 BCG. Some of my favorites are the BCM or Noveske charging handles found in the links below.
https://www.opticsplanet.com/bravo-company-mfg-bcmgunfighter-charging-handle.html
https://www.opticsplanet.com/noveske-charging-handle-7-62mm-super-badass-ambi-sr-25-black.html