Do not buy parts for an 1895. Your XLR is a 336 with a smaller loading gate opening. If you have a dremel tool try taking a very small carbide bit and cut the screw til you can remove the loading gate. Make sure you secure your gun so you can hold your dremel with two hands, with your elbows braced for stability. Once removed you should be able to remove the screw from the gate. If you have the gate removed try soaking it for several days in some solvent then try removing it. Usually a little heat will go a long way.
A good gunsmith will remove that screw.