No, it will not.
No, they are completely different in receiver contour, stock bolt and mounting hardware, and trigger guard and tang cut. Will not fit.
ATI Stock will not fit 410.
The ATI Outdoors Shotforce Pistol Grip Stock SPG0100 length of pull is 14".
The ATI Outdoor Shotgun Buttstock/ Pistol Grip 12/20 GA might work. However, since the manufacturer does not list it as a compatible model I recommend contacting ATI to confirm compatibility.
The ATI Outdoor Shotgun Buttstock/ Pistol Grip will not work with a Smei Auto Pardus 12 gauge.
I recommend contacting American Tactical for a recommendation on just a pistol grip with no stock that is compatible with that shotgun.
ATI tested and confirmed fitment for the Maverick 88 12ga & 20ga (proud fit), Mossberg 500/535/590/835 12ga & 20ga (proud fit), Remington 870 12ga, and Winchester 1200/1300 12ga & 20ga (proud fit). ATI has not tested fitment with the Citadel Warthog and cannot confirm fitment.
No. ATI tested and confirmed fitment for the Maverick 88 12ga & 20ga (proud fit), Mossberg 500/535/590/835 12ga & 20ga (proud fit), Remington 870 12ga, and Winchester 1200/1300 12ga & 20ga (proud fit). Citadel shotguns are not listed as compatible options for this stock.
The ATI Outdoor Shotgun Buttstock/ Pistol Grip is stated as being compatible with the 12ga Remington 870 and not the 20ga. I would recommend reaching out to ATI directly to see if it could be compatible. Their contact info is linked below:
https://www.atioutdoors.com/contact/