I don't have an M6 but I have seen a few around. My preference is the Savage Model 24C and is a .22LR over 20 gauge. I hunted alot as a teenager with a double barrel .410 and learned its limitations well. That is why I chose to go with a 20 gauge. I have a sling on it that holds 9 shotgun shells and a 5 shot shell holder on the stock. The stock holds 2 shotgun shells and 10 .22LR internally. Also around the fore stock I have a Sidekick pouch with about 100 rounds of .22 ammo. The shotgun ammo is a combination of Slugs, 4 Buck, 2 shot, 4 shot and 7 1/2 shot. I take this with me when ever I head to the hills, which is frequently. I have a second bag of ammo if I choose to carry it with about 400 rounds of .22 and 50 assorted rounds of 20 gauge.