I have the 2nd gen SF stock for AR variants.
I put a total of 1 (one) 20rd magazine of .223 through it.
Yep, fun for sure but $12-$25 in 3 seconds is too rich for my budget.
The SF now lives on my M&P 15-22.
With a light (3lb) JP trigger in the lower it cycles just fine even with the minimal .22 LR recoil.
With rimfire ammo it is a LOT of fun and is plenty affordable for me. Got a couple extra 25rd magazines.
I don't see them (the SF stock) as available forever, and so I bought one when I could.
Plus, I can always throw it onto one of my 'real' rifles if I ever want/need to.
To ban guns, you must first ban knowledge of guns.
To ban knowledge of guns,
you must first ban knowledge itself."
- L. Neil Smith