If you already have a 650 with both in addition to both a 650 & 651 without, I would add the extra LR cylinder on the 651. Then you would have both sister models with both cylinders. That would leave you with an extra 650 with just the WMR cylinder. You could use that 650 with the new Win Subsonic loading to give you low blast/recoil/flash for a great trail/kit gun