All though they are not of a traditional design Sinclair International does sell clamp on front sights that are typically used on Palma Rifles that could possibly fit your needs.

Another option would be to fabricate a full length tube site like the one pictured below.

(You need to Login or Register to view media files and links)

J.Louis

Click on the below link this was a real good thread on the tube sight.

(You need to Login or Register to view media files and links)

J.Louis

Hello, I am still puzzled though about that one #8 screw 1/2" back from muzzle on top of brl.  When it was set up, why didn't they just drill another & use a scope block?

Hello, frnkeore.  Thanks for reply.  That makes alot of sense..one screw easier to do on drill press & no worry of 2nd. screw match up alignment.  The brl. has scope blks.,  the only reason I wanted a front sight was to use a tube type rear sight..mounted on blks.  I talked to Gary Quinlan..he thought since this is an early 1930 gun, a Winchester globe front would look good & be correct.  I am just wondering how to mount this sight.  I can machine a contoured to brl. block & use single screw to hold in place..but wondering how to get around hammering that dovetail base of Win. sight in place..also would need to pound off to remove block..Perhaps a small set screw & "gib" in femail dovetail?
I know this is alot of fooling around just to mount a front..but really don't want to drill & tap a Pope brl!
    The only other way would be to find a reproduction or original full length "tube sight"  I understand a company in Ohio called Buckeye made them in various lengths?