You can trust Wolff Springs. I have been using their products for decades. I use them in both revolvers and autos. If it is a coil spring for just about any firearm, they have it in stock. Likewise, if it is somehow a spring type they don't have, send them a good specimen and they will make one. For decades could mean I bought one 20 years ago, and it does, but it also means I have been using them fairly consistently and have bought products from them at least 4 times in the past month alone. Their products are good.