The Firefield Barrage 1-5x32 Rifle Scope might hold up fine with the recoil of a 450 Bushmaster. However, since on average there is more recoil from 450 Bushmaster I recommend contacting Firefield to confirm compatibility.
This optic is a 1.5x-5xx32 scope.
This optic is rated for calibers up to and including the .308 Winchester.
This is more of a short to medium eye relief scope. The eye relief extends up to 5.1" from the ocular lens.
The difference is the included laser. The two at increased costs come with a detachable laser. The MPN:FF13062f has a red detachable laser while the MPN:FF13063 has a green detachable laser.
Yes, the reticle is visible without illumination.
I found my own answer and including it here in case someone else has the same issue. Monstrum Tactical Scope Flip Cap. For the rear eyepiece lens the size is 43-48mm. Goes on easily and is snug enough. For the front objective lens the size is 37-42mm. The downward side of the cap will need to be pulled on as far as it will go which will mean the cap will be at a slight angle similar to the sunshade on the scope. But it works and looks good.
I just bought it anyway. To answer myself, yes, it fits great. Lol.
Yes, it includes a long-lasting (100-hour) CR2032 battery.