SHOT Show 2019: Top Five Great New Guns

I like them all. I'm wondering where the buffer spring is on the Brownell? In the folding stock?
SGT Edward Wilcox, Lt Col Charlie Brown,
SSG Diane R., SPC Margaret Higgins,
CPT Jack Durish, Cpl Jeff N., LTC Charles Blake,
SGT (Join to see), SPC Gary Welch,
Maj Robert Thornton, CPL Douglas Chrysler,
Maj Marty Hogan, LTC (Join to see),
LT Brad McInnis,MSgt Robert "Rock" Aldi,
PO1 John Johnson,MSgt David Hoffman,
COL Mikel J. Burroughs, CW5 Jack Cardwell