George-- same way I keep my M25 riot gun in 12 gauge- 5 in the mag, chamber empty--and a Allen black nylon shell carrier with 5 extra rds. slipped in place on the ejection port side-on the butt (as I am right handed). No better weapon for an O-dark-30 SHTF scenario-IMO.

Noticed that the SEALs Chief in the photo had a M37 with the "duckbill", but I could not see the rest of the buttstock, just the pg covered by his right hand.

I concur with your thoughts of the sound of a round "going into the chamber" being a possible deterrent to "what comes next"--RWTF

"The field is the touchstone of the man"..