What are the opinions about the side charging uppers, I think the op asked earlier. I am curious too. I guess you would need a tool to get the bolt out but sure would be nice with some scope arrangements.
The BCA requires a 5/32” hex key to remove the bolt handle. The threaded plug where a regular charging handle would go comes out with your fingers.
I bought a 20” heavy SS Wilde Gen 2, rifle-length upper. Under 100 rounds but is shooting nicely and the inside is still clean. Needs a better trigger than the very heavy one tripping it now, which is a challenge. $211.
The side charging makes scope mounting simple and flexible.