Just ordered a Buck Rail AR stock for my 2240 and just got it in the mail almost as fast as clicking buy
I am impressed with its quality and clever design. It consist of a standard AR stock, with a 3D printed buffer tube that has the adapter that replaces the guns hammer tube endcap is built right in. Installation was a snap I have paid more for such setups, and had to do much more fiddling around.
Here is a pic of it with a set of black grips I had to borrow off my 1377, as the wood grain OEM grps are at my wood workers shop as a pattern for new wood grips, hope to get them soon