I'm new to the forum, have been around though. CA POST Academy in '93, OR DPSST in '98 for Corrections, Basic SWAT at work in '99, couple of 10 8 courses-one of which was with Rob Haught in So Cal in 2007. I remember meeting DB and Matt Haught there... In my early days on the team I was on, we were primarily a shotgun (for primary) entry weapon, so we did a lot of feeding the beast type of drills. 8.5 years until a knee injury had me step down from the team. Still miss it...
I choose a pistol grip stock on my 870. I find it easier to keep the muzzle up at my shoulder than a traditional rifle stock. I went from a plus 2 mag extension to a plus one to cut down on muzzle weight. 2 days with Rob Haught taught me that...
Here is my 870 that I've had for 20 odd years. My side saddle is just the standard tacstar of the day. I keep my shells rim up since I go with the idea of keeping the brass above the plastic so that I can jam the shells further down for extra retention the plastic isn't stretched out too much. Maybe I'll update to cards one of these days... ...Tacstar is still in good shape.
I like the ghost rings, they have me able to engage out to 100 yards in my limited practice. No slugs at work unfortunately. I keep my shotgun loaded with #4 buck as the first round with the next four being 00 buck. Side saddle is all 00, and my speed feed stock (yes it's heavy, but it is the most comfortable I've found and I like the extra ammo that is truly out of the way) with slugs in it. I cut the LOP down so the ammo is limited to one on each side rather than the original two on each side. I have an Aimpoint on my M4-ish rifle but I haven't decided that I need yet another thing bolted to my shotgun for my needs. Original Surefire fore end even though it's heavy, it doesn't even have a cut off switch it's so old. It's still like new though, one training course and then my own drills on the range is all. I take out the bulb and batteries when it's day time range.
My reload revolves around what I have understood (it called here) as the violin method of turning the shotgun 90 degrees ejection port up and resting the side of the stock backed up on my shoulder a bit so as to shorten up the overall extension from my body. This is so that if I need to start a reload of a newly emptied shotgun, I can grab the shell rim (support hand) and watch it all the way into the port and then a quick turn, remount to the shoulder and action close. I find this less fumble likely compared to palming the shell and going underneath the shotgun for me. Even though subsequent shells do have to make a longer trip rim up to the loading port, I feel that that first round getting up is most important and the rest can get there as I can. I don't do a combo rim up and down cause I want to keep all of them the same.
I look at those new Beretta 1301s with interest though...