Greetings. In an attempt to customize my new AR15 rifle, I removed the buffer tube so that I could add a Magpul single point end plate adapter. The force that was used in removing the staked castle nut, caused me to bend the safety detent spring once the end plate was removed. Oops! There are several vendors advertising the sale of this springs. However, no part numbers are given. The Mossberg parts list from the owner's manual does not provide a part number for the detent spring either. I have written to Mossberg, but I do not want to rely strictly upon the company for a resposne. Any suggetsions? Please & Thank you. stokes