I just changed out the folding M4 stock for an A2 model. I needed to put the original spring back in however as the one that came with the A2 caused cycling issues. The bolt didn’t go back far enough and the carrier caused a misfeed bad enough to separate the bullet from its casing by crushing the rim. Has anyone else had a problem like this?

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I rue most days

It will function AS-WAS if you make an aluminum (or whatever) cylinder to drop down the longer A2 tube, then just drop the stock spring and buffer on top of it. If you will carefully measure the inside length of the stock S&W folder's tube, then the inside of the A2's tube you can determine the length of the plug(cylinder) you need. This will trick the stock parts into believing they are still in the stock S&W folder.
I have heard that a stack of quarters will suffice in the interim. Cheers!