

(I'm still getting the suggested low-recoil 12 ga ammo, but also ...)
Still thinking out loud ...
The SA-20 looks good so far, maybe a Weatherby SA-459™ TR
One thing I don't comprehend is in Pumps, the capacity can be 8 or so on "tactical" shotguns, but all manufacturers produce "reduced capacity" semi-auto home defense shotguns and you have to locate extension tubes ... oh well.
Comparing Mossberg SA-20 to similar Weatherby SA-459™ TR:
Weatherby SA-459™ TR (TR = Threat Response... because California doesn't like "Tactical" but it's ok to respond to a threat ...so far)
BBl-18-1/2" + "removeable" Extended Ported Cylinder=20"
OAL-39" with extender, 37.5" without extender
**Unknown if stock can be shortened a little too, for shorter OAL ... aftermarket recoil pads?
(Tx penal code chapter 46:
(10) "Short-barrel firearm" means a rifle with a barrel length of less than 16 inches or a shotgun with a barrel length of less than 18 inches, or any weapon made from a shotgun or rifle if, as altered, it has an overall length of less than 26 inches)
Mossberg SA-20
BBl-20" ... front sight prevents cutting
OAL 37"
**Unknown if stock can be shortened a little too, for shorter OAL ... aftermarket recoil pads?
(Tx penal code chapter 46:
(10) "Short-barrel firearm" means a rifle with a barrel length of less than 16 inches or a shotgun with a barrel length of less than 18 inches, or any weapon made from a shotgun or rifle if, as altered, it has an overall length of less than 26 inches)
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http://www.weatherby.com/product/shotgu ... r/sa459_tr" onclick="window.open(this.href);return false;
Weatherby also has a similar SA-459™ TR
MSRP $699.00
*Actual price may vary.
View International Pricing Information.
Dependable semi-auto action designed specifically for home defense.
20ga 3" 6 lbs. OAL-39" Synthetic BBl-18-1/2" Extended Ported Cylinder Length of Pull=13 1/2" NA NA
Gas-operated semi-auto action reduces felt recoil
Features a trimmer forend for easy handling
18 1/2" barrel with removable extended ported cylinder choke tube (OAL 20")
Oversized hourglass bolt handle is easy to locate and operate
20 gauge is ideal for female or smaller shooters
Swivel studs included
Available in 12 or 20 gauge
Weatherby SA-459™ TR (TR = Threat Response... because California doesn't like "Tactical" but it's ok to respond to a threat ...so far)

SA-20
75781 20ga 3" TOP RAIL;EASY LOAD ELEVATOR 5 BBl-20" GROOVED RAIL; [abbreviated profanity deleted] FRONT CYLINDER BORE oal 37" pull-14" Matte Blue SYNTHETIC BLACK; FULL STOCK; PISTOL GRIP 6 LBS
Mossberg SA-20

http://www.mossberg.com/products/defaul ... play=specs" onclick="window.open(this.href);return false;
I'll probably be owning a 20 ga soon .... and keeping the 12 with low recoil ammo in another spot in the house.
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Every time I ask for help on ammo ... I buy more guns ... which is a fact a buddy of mine loves who buys unfired guns from me which I bought in the 1980s ...

I'm going to quit parting with stuff though, 2 weeks ago I started carrying 2 guns regularly as BUGS (yes I tested them) which I thought I wouldn't carry much P11 and PF9 to back up my Glock 26, and the XD45
(carrying them because I got dultuh trading co 5-pocket jeans with 12" deeper front pockets)