A grizzly is NOT an 870.
Remington has a proven reputation with their 870s. Dominion Grizzly does not. Correction, it does ... a bad one it seems.
Hope you don't trust your life to a Grizzly having it out in the wilderness.
Okie dokie mr high speed elitist, thanks for adding nothing of value.
Next, the stock follower is finicky when grit gets in it, got to keep it clean an clear of any debris.
Loading shells you've dropped on ground is one of the major culprits of this, an also dipping it in stuff.
Take the end cap off, pop the follower spring and follower out.
Wipe down the spring and follower an run a rag or patches/ect through the tube to clear it of any debris, now run a clean patch with gun oil on it through a few times then reassemble it back together.
Make sure to put a generous amount of oil on the spring as well.
It's just the nature of shotguns if ya get crap in there it's going to act up as it's designed to slide smoothly, not against dirt ect.
Hope that helps.
An btw, it's an 870 CLONE. Grizz/HP9 same #### 1.5" barrel diff an Norc name. Griz ships in a Norc HP-9 box as well. Also uses any part the 870's use pretty much.