I recently purchased a Sig556 SWAT that has a Swiss style collapsible/folding stock on it. I would like to remove this Swiss style stock and replace it with a Magpul ACS stock. Can this be done and if so what parts and pieces do I need.
Thanks for your response.
You have two options fo putting any stock made for an AR to a 556.
1. Use the early version 556 that was made to take the AR buffer tuber. I am sure you would have no problem finding someone with an old lower to swap for your classic lower. You would need a front pin for the old lower to replace the screw pin if it still has those.
2. DDLES makes an Adapter to put an AR stock on a 556 classic lower, but it isn't released yet.