I bought my youngest son the Remington 870 Express 'Youth' gun.
It is in 20 gauge, and has a 21" vent rib barrel.
I found a 'beater' stock at a gunshow (Remington 74x and 76x series rifles have the same dimensions as the 20 ga scattergun) and cut it down to fit my son.
Be forewarned. . . . the recoil pad on the Express Youth gun is that, in name only. That factory pad is rock hard.
With Winchester AA loads, this scattergun was beating my young son.
I wound up putting a Limbsaver pad on this 'beater' stock, and he has no more problems.
I highly recommend a Limbsaver Pad in place of the factory pad!!!!!!!!!
(Note: I've recently ordered and received a Knoxx 'SpecOps' stock for 20 gauge, that will go on his 870, very soon!)
I also bought the 11-87 Youth scattergun for my son, my wife and my youngest daughter to shoot.
For my son, the stock is still a little long, but, for the girls at home, this shotgun is great!!!!!!!
It recoils like a 28 ga., or even a .410!!!!
Thanks for reading.