1. Can you put a rifled choke on this gun?
Yes, simply unscrew that door breacher/DNA sampler thingy off the end and install any Rem Choke you like as long as it's 12 gauge. Rifled chokes are available. Opinions differ on whether they are actually very effective. The longer the rifled choke the better seems to be the consensus.
2. If so, what slugs? (foster,rifled, sabot?)
Foster slugs and rifled slugs are pretty much the same thing. Although Brenneke's are also lumped in with the overall catchall category of "rifled" slugs, which is a bit of a misnomer in and of itself. The "rifling" really doesn't spin the projectile very much. They get their stability from the weight forward design. The base is hollow and expands like a skirt to get a good gas seal in the barrel. The "rifling" allows the slug to swage down easier through a choked barrel. Brenneke's use an attached plastic wad to accomplish the same weight forward principle. They are also a bit harder lead alloy, designed specifically for thicker skinned game such as boars.
Sabot slugs can still be shot from a smoothbore barrel, but accuracy will likely be bad. They really do need spin imparted to stabilize as, much like a rifle bullet, the weight is in the rear. A rifled choke shooting Sabots is better than no rifling at all, but best results do come with a fully rifled barrel. When you are talking per round costs approaching 3, 4, or even 5 bucks you might want to stick to foster/brenneke designs if you're not using a fully rifled barrel.
3. Will tac. choke work with foster slugs?
It should, IIRC the tactical choke is either cylinder bore or improved cylinder. Never used one myself so I can't give any help on accuracy effects of the extended/ported/toothed configuration of the choke.
Of all the shotguns here in the safe that are set up for "social" purposes, most have either a fixed IC barrel or a remchoke barrel with IC choke installed. With my preferred brand of buckshot the IC choke works well to any reasonable buckshot engagement range and gives me the best option for slug usage beyond that.
The sole exception is my Mossberg 500 which has an extended modified choke as I've found for some reason that gun patterns best with the modified and slugs still do well with it within my limits with a bead sight.
Mossbergs are just wierd I guess.........
Forgot this one:
What accuracy can I expect out of slugs with this gun?
You're practical limitation on slug shooting with that particular setup is the bead sight. You can get very good with practice, but it will take practice to place slugs on target much past 50 yds. With a rifled sight setup you can more easily extend that practical range. On a good day when the Shotgun Gods are smiling upon me I can manage 4-5" groups at 75yds freehanded with a Remington with a rifle sighted barrel. I can stretch that to 100 by using field expedient rests (tree limbs, leaned against a post/tree, etc.).
I've been using rifle sighted barrels for slug shooting (and general turkey and deer hunting with shot) that I do not do so well with a bead and slugs anymore beyond social engagement distances. Out of practice....
