Ok, guys I have another of my "why would you want to do that" questions for y'all.
I have a 308 Bushmanster ORC that I want to convert to an iron sight gun. In normal times, I might just sell it and buy the gun I want, but I haven't seen the exact configuration I want for sale anywhere, even before the panic. So I think my best option is to change what I have to what I want.
My first and most pressing question is what to do about a free float tube. When I search on 308 free float tubes for Bushmaster I get some conflicting information on what will fit, and whether a standard AR tube will fit or if I need a special adapter. My gun looks exactly like this, except I have MOE hand guards on it. Since I was able to replace the hand guards with standard AR furniture, it stands to reason the mounting for free float tubes might also be the same. If I understand the difference, I only have to worry about the odd size free float tube/adapter if my rifle came with a FF tube from the factory, which mine did not.
What I think I want is to run a free float out to the brake, and use a standard AR fixed Rear sight. Where I am on the fence is with the front sight.
First option is to clamp a normal front sight [or a folding one] to the barrel, butted up against the back of the brake, and stop the free float tube just before it. I want to clamp because I don't want to mill for pins and I am not going to jack with the gas system. My objective is to get the longest sight radius I can.
Second option is to go with a longer tube, and attach the FS to the tube. This has the advantage of seeming simpler but since the front sight is going to take some abuse [this s going to be a 3 gun rifle] going into barricades and dump barrels I would want to be sure it was going to stay put.
It seems clamped to the barrel might be strongest and most durable, but the least elegant, and in the way if I decide to clamp on a scope for load testing. A folding clamp on like an ARMS #41 or the YHM 9394 would solve the "in the way" part but be less durable. The unknown [by me] is where a free float mounted front sight fits in.
If it makes a difference I am considering an AP Carbon fiber tube to save some weight.