I bought a promag set for both my 91 & 93 (clones) and they both function great. it was a little hard to insert on my 91 but now that it's in, it functions great. If you're looking for a good price, i got mine from blackbear. It was $25 cheaper than Robert RTG and did exactly what i needed it to do.
Black Bear Sporting Goods - Hunting, Archery, Fishing, Camping, Hiking, Boating, & more.