Passed on it....
Denny, the SB was my first 20 gauge turkey gun. It is deadly. It will need trigger work. The safety can be a pia. Some don't like Mossy's because of the "rattle". I shot TSS out of it and it is a stone killer.
(http://www.hunt101.com/data/500/medium/buffer_and_no_buffer_004.JPG)
Denny, don't know if the LPA fits the 20. However, a competent gunsmith can do wonders with the trigger as is. The M500 trigger group is pretty complicated and I don't recommend shady tree work.
My son has one. We had to put an adult stock on his, as he outgrew the youth stock the gun came with.
His is all black with a FFII on top of it. I have kept the stock full choke in it, and with 3" Federal Heviweight #7's, she puts up 193 in the 10" circle at 30 yards! This is out of a gun with an 18.5" barrel.
Great youth guns. I just might pick one up myself, and retire the 835.
Denny, ask the seller if he has the certificate for the adult stock. It came with the gun and gives a discount from Mossberg. I kept the youth stock with all spacers intact and added a slip on recoil pad. It not only helps with LOP, but reduces recoil considerably since the padding is doubled up. I use a PG .570. I tried a PG .555 and it was too tight. I only shoot TSS 9s. Dunno about what works best on the HW. I haven't tried the Sumtoy, but that's what's on my other guns. Gil
one of the best 20ga rigs out there