Sure looks to be the same style as the Remington. But I would bet the same company makes them all, maybe Speedfeed? I have seen the Remington versions be very tight also, and require some judicious sanding to get on the fore-end tube. But someone could have made a mistake.
Too small is still better than too large, long as it is not 'way too small.
Saw a split in the end of a piece of the biggest diameter dowel your drill will take in its chuck, the dowel being long enough to reach at least halfway through the forearm, insert a piece of sandpaper, wrap around the dowel so the grit is outside, and sand away. Best if it is a variable speed drill, run on slow to medium speed, you'll see what works best (the coarser the grit of the sandpaper, the slower the drill).
Remember, I said _judicious_- try the fit often in the process. Could be just a tight spot, only sand what won't fit.
hth,
lpl/nc