Have finished up a CNC manufacturing run of the stock adapters designed to add a more sturdy folding stock to these great Subguns. Folding stocks such as the Sig Sauer Minimalist Plus, Telescoping Folding stock, Sig Thin Folding Stock, and others will all fit with a 1913 interface. This enables you to have a much sturdier stock while in FA fire. They look good too! This is not a business for me. It started as an idea from another person, and is now a cool project with many hours put into it. Limited quantity will be available due to the cost of machining/manufacturing. Absolutely no modifications are needed on your registered gun! If interested please email me for more information on the adapter, shipping, etc. Adapter Cost is $235.00 shipped in the lower 48. Thank You, Email: brmiles@sbcglobal.net Opee