Well, I didn't buy the bump fire stock---YET ???---
But I did buy a CMMG .22 conversion for the Sport---and am now practicing a more "rapid fire" approach with very minimal $$$ pain.
I was too dollar sensitive to even try a quick fire burst with the .556, and perhaps a bit leery of the possible downrange effects and direction with no "experience" of a cartridge that powerful.
But the .22 is great on the learning curve. I put about 150 rds of .22 through and about 50 of those were in 10-15 bursts in quite a rapid finger trigger pulling session. (25 Rd mags)
Quite fun enough at the moment!
Aiming from the hip by adjustments on the miss is pretty neat. There is a low spot in the ground behind the spinner targets I was shooting at ~ 30 Yds down range.
Since it had been raining, it had filled with water to make about a 20' x 4' puddle behind the spinner. The water spray gave me some guidance.
So then I was confident enough to try some rapid fire with the .556.
But smart enough to only load one 10 round clip !