Before sending it back you should really try one of the top mounted peep sight setups. Williams has WGRS sights which mount on top and should fit and work just as good as the foolproof. some may even work with your current front bead. The only advantage to the foolproofs is that you can get it with turrets so you can adjust windage etc in the field which is really not an advantage for a causal shooter like me.Also you cancheck out XS sight systems whose ghost ring sights fit fine on an 1894. Good for short range work(less than 50 yds). You can still hit at farther ranges but the blade is really too big to give confidenceand a finer front beadwould be better like on the williams setups.Good luck.
Check out brownells or midway to see a whole bunch of possible choices that you may be able to buy for the cost of shipping the gun or just a little more.