I had a Leupold one piece on my 358 Brush Gun and eventually replaced it with Weavers (early 80's I think). Damn screws wouldn't stay tight, especially the rear screw that clamped the ring to the base.
Haven't had a problem with the Weavers.
Plus, I find I have more room with the 2 piece bases to fumble cartridges into the magazine when my fingers are cold or I'm wearing gloves.
Dale
